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RE: [Dev-C++] how to use strings

[Ioannis V. <no...@ya...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Michael Codadeen
> Sent: Tuesday, September 04, 2001 12:00 PM
> To: dev...@li...
> Subject: RE: [Dev-C++] how to use strings
> 
> 
> Hi Johannes,
> 
> I believe that fprintf() does move the file pointer it just 
> looks as though 
> it isn't, try using ftell() to print the file position.
> 
> I believe that because there is a struct being written to the 
> file via 
> fread() and then a string via fprintf() this is causing the 

fread() *reads*. fwrite() writes.


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys

RE: [Dev-C++] how to use strings

[Ioannis V. <no...@ya...>]

> -----Original Message-----
> From: dev...@li...=20
> [mailto:dev...@li...] On Behalf=20
> Of Michael Codadeen
> Sent: Tuesday, September 04, 2001 9:49 AM
> To: dev...@li...
> Subject: RE: [Dev-C++] how to use strings
>=20
>=20
> Hi,
>=20
> Did you get the fprintf to work because I am still having trouble.
>=20
> I have also tried it at work on a HPUX 10.20 aCC compiler but neither=20
> version works for reading from a file.
>=20
>   fprintf (stdout, "%s", fhandle);
>   fprintf (stdout, "%s", *fhandle);
>=20
> Note, the second version works on the Dev C++ compiler but=20
> reads the first=20
> line only.

fprintf() does NOT read from a file, it *writes* to the file.

An example:

FILE *fp=3Dfopen("/usr/tony/test.txt", w");
...
fprintf(fp, "This is written to the file.");
fprintf(fp, "A number %d\n\n", 7);
/* Do what you have to do */
fclose(fp);

If you want the data to be written immediately to the file after one
fprintf(), you can flush the cache buffer:

fflush(fp); /* It flushes the file buffer. All data are written to the
disk */

>=20
> And yes, I agree there are many ways to move the file pointer=20
> and that=20
> seeking to the end of a string is bad strategy. I was just=20
> trying to get the=20
> thing to read from a file using fprintf().

I know, hat's why it did not work, since fprintf() is for *writing* to
a stream. For example you can write to the monitor:

fprintf(stdout, "Hello new stream world!\n");

>=20
> Michael




Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys

RE: [Dev-C++] how to use strings

[Michael C. <jd...@ho...>]

I read your first mail and have to agree that there may well be undefined 
results when you mix and match like we have done.

As for your answer to the second problem, see below for more comments...


>From: Johannes Pretorius <joh...@pr...>
>To: dev...@li...
>Subject: RE: [Dev-C++] how to use strings
>Date: Tue, 04 Sep 2001 14:51:17 +0200
>
>Okay
>Problem 2 is actually kinda simple in the sense if I understand you 
>correctly
>
>//SNIP
>
>#include <stdio.h>
>#include <alloc.h>
>
>main(int argc, char *argv[]) {
>    FILE *CheckFile;
>    int Byte;
>    unsigned int Checksum;
>    int read=-1;
>    int filePos =0;
>
>    if ( argc != 2 ) {
>       printf("usage: checksum filename\n");
>       exit(1);
>    }
>
>    if ( (CheckFile = fopen(argv[1], "rb")) == NULL ) {
>       printf("Can't open file: %s\n", argv[1]);
>       exit(1);
>    }
>
>    /* Initialize the checksum accumulator */
>    Checksum = 0;
>
>  fseek (CheckFile, 0L, SEEK_SET);
>
>     char c1[100];
>     char c2[100];
>     char c3[100];
>     char c4[100];
>     char c5[100];
>
>     memset(c1,0,100);
>     memset(c2,0,100);
>     memset(c3,0,100);
>     memset(c4,0,100);
>     memset(c5,0,100);
>     printf ("pos %d\n", ftell (CheckFile));
>     printf("Succesfull assignments : %d c1 : %s\n c2 : %s\n",fscanf
>(CheckFile, "%s%s%*[\n]", c1, c2),c1,c2);
>
>      //part 1
>      printf("Succesfull assignments : %d c3 : %s\n c4 : %s\n c5 : %s
>",fscanf (CheckFile, "%*[^'O]%s%s%s", c3, c4, c5),c3,c4,c5);

*** There is a single quote missing in this, as in my original mail it *** 
should read 'O', the character constant for the letter O.

***The following also works but misses the \n.

***fscanf (fhandle, "%s%s%*[^'O']%s%s%s", c1, c2, c3, c4, c5);


>      //part 2
>      //printf("Succesfull assignments : %d c3 : %s\n c4 : %s\n c5 : %s
>",fscanf (CheckFile, "%s%s%s%*[\n]", c3, c4, c5),c3,c4,c5);
>     printf ("pos %d\n", ftell (CheckFile));
>    fclose(CheckFile);
>    exit(0);
>}
>
>//END SNIP
>
>If you take the above code and run it it does the same as your application.
>If you comment part 1 out and uncomment part 2 it reads the next line as
>needed. The reason is that you have told the function to move the
>cursor until it reaches one of the specified characeters in part 1 that is
>a qute (') or a captial O. This is why it runs until past that point as one
>of there charcters only
>comes after that to test. Enter a capital O in the second line of the 
>program.

***As described above, my original example had 'O' in it.

>
>Well this is all I can think of now. One thing thou using %s to read a
>string into a char array is DANGEROUS for the function will read the string
>into it regardless of its size.
>To test put in a string in the first line that is MORE than 100 then printf
>(well I geuss my program can also be wrong)
>
>if you rather use a char pointer you can read in more that the 100
>specified. yust remmeber the free.. here is a code sample to replace in the
>above.

***
I agree. I think a buffer large enough should be allocated for the data to 
be placed into. However, in your example you missed out the new() for c1. 
The result would be a core dump.

The size for the buffer could be obtained by the number of bytes read and 
returned by fread(). As you know fscanf() returns the number of succesfully 
assigned input items.

>
>//SNIP 2
>     char *c1;
>     char c2[100];
>     char c3[100];
>     char c4[100];
>     char c5[100];
>
>//    memset(c1,0,100);
>     memset(c2,0,100);
>     memset(c3,0,100);
>     memset(c4,0,100);
>     memset(c5,0,100);
>     printf ("pos %d\n", ftell (CheckFile));
>     printf("Succesfull assignments : %d c1 : %s\n c2 : %s\n",fscanf
>(CheckFile, "%s%s", c1, c2),c1,c2);
>     free(c1);
>//END SNIP 2
>
>Well good luck
>Johannes
>
>

I think we have done this subject to death now.

Thanks for all your input.

Michael
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>Dev-cpp-users mailing list
>Dev...@li...
>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users


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RE: [Dev-C++] how to use strings

[Johannes P. <joh...@pr...>]

Okay
Problem 2 is actually kinda simple in the sense if I understand you correctly

//SNIP

#include <stdio.h>
#include <alloc.h>

main(int argc, char *argv[]) {
    FILE *CheckFile;
    int Byte;
    unsigned int Checksum;
    int read=-1;
    int filePos =0;

    if ( argc != 2 ) {
       printf("usage: checksum filename\n");
       exit(1);
    }

    if ( (CheckFile = fopen(argv[1], "rb")) == NULL ) {
       printf("Can't open file: %s\n", argv[1]);
       exit(1);
    }

    /* Initialize the checksum accumulator */
    Checksum = 0;

  fseek (CheckFile, 0L, SEEK_SET);

     char c1[100];
     char c2[100];
     char c3[100];
     char c4[100];
     char c5[100];

     memset(c1,0,100);
     memset(c2,0,100);
     memset(c3,0,100);
     memset(c4,0,100);
     memset(c5,0,100);
     printf ("pos %d\n", ftell (CheckFile));
     printf("Succesfull assignments : %d c1 : %s\n c2 : %s\n",fscanf 
(CheckFile, "%s%s%*[\n]", c1, c2),c1,c2);

      //part 1
      printf("Succesfull assignments : %d c3 : %s\n c4 : %s\n c5 : %s 
",fscanf (CheckFile, "%*[^'O]%s%s%s", c3, c4, c5),c3,c4,c5);
      //part 2
      //printf("Succesfull assignments : %d c3 : %s\n c4 : %s\n c5 : %s 
",fscanf (CheckFile, "%s%s%s%*[\n]", c3, c4, c5),c3,c4,c5);
     printf ("pos %d\n", ftell (CheckFile));
    fclose(CheckFile);
    exit(0);
}

//END SNIP

If you take the above code and run it it does the same as your application.
If you comment part 1 out and uncomment part 2 it reads the next line as 
needed. The reason is that you have told the function to move the
cursor until it reaches one of the specified characeters in part 1 that is 
a qute (') or a captial O. This is why it runs until past that point as one 
of there charcters only
comes after that to test. Enter a capital O in the second line of the program.

Well this is all I can think of now. One thing thou using %s to read a 
string into a char array is DANGEROUS for the function will read the string 
into it regardless of its size.
To test put in a string in the first line that is MORE than 100 then printf 
(well I geuss my program can also be wrong)

if you rather use a char pointer you can read in more that the 100 
specified. yust remmeber the free.. here is a code sample to replace in the 
above.

//SNIP 2
     char *c1;
     char c2[100];
     char c3[100];
     char c4[100];
     char c5[100];

//    memset(c1,0,100);
     memset(c2,0,100);
     memset(c3,0,100);
     memset(c4,0,100);
     memset(c5,0,100);
     printf ("pos %d\n", ftell (CheckFile));
     printf("Succesfull assignments : %d c1 : %s\n c2 : %s\n",fscanf 
(CheckFile, "%s%s", c1, c2),c1,c2);
     free(c1);
//END SNIP 2

Well good luck
Johannes

[Dev-C++] how to use strings

[Johannes P. <joh...@pr...>]

>Date: Tue, 04 Sep 2001 13:28:15 +0200
>To: "Michael Codadeen" <jd...@ho...>
>From: Johannes Pretorius <joh...@pr...>
>Subject: RE: [Dev-C++] how to use strings
>
>Hi Michael
>----------------
>
>it seems I described the reason I believe fprintf() wont move the file 
>pointer wrong. What I remember and please correct me if I
>am wrong is that the following :
>FILE *filepointer;
>is actually a pointer to a STRUCTURE that is named FILE. This meaning it 
>is NOT a memory alocation pointer. I did this long ago so
>the change is very big that I am wrong. So to start of this means that 
>reading from the filepointer to stream data to the output stream
>if it is with fprintf() or sprintf() the function does not know HOW to get 
>the data (the data is internal to the structure) and secondly the function 
>was not writen
>to move the stream pointer (as with sockets I cant remember now but I 
>belive you have to use a different reader to get the data. The chance is 
>that I am
>incorrect and you must use sprintf as I have done this about 2 years ago I 
>kinda forgot with all this Delphi.). But anyways try this application.
>
>//SNIP
>
>#include <stdio.h>
>
>main(int argc, char *argv[]) {
>    FILE *CheckFile;
>    int Byte;
>    unsigned int Checksum;
>    int read=-1;
>    int filePos =0;
>
>    if ( argc != 2 ) {
>       printf("usage: checksum filename\n");
>       exit(1);
>    }
>
>    if ( (CheckFile = fopen(argv[1], "r")) == NULL ) {
>       printf("Can't open file: %s\n", argv[1]);
>       exit(1);
>    }
>
>    /* Initialize the checksum accumulator */
>    Checksum = 0;
>
>    /* Add each byte in turn into the checksum accumulator */
>    while ((!feof(CheckFile)) && (!ferror(CheckFile))) {
>       filePos = ftell(CheckFile);
>       printf("filePos : %d\n",filePos);
>       read = fprintf(stdout,"%s",*CheckFile);
>       if (read){
>         printf("read : %d\n",read);
>         if  ((!feof(CheckFile)) && (!ferror(CheckFile))) {
>           printf("set file pos\n");
>           if (fseek(CheckFile,read,SEEK_CUR) != 0){
>              printf("Error setting file Pos\n");
>               break;
>            }
>         }else{
>           break;
>         }
>       } else{
>            printf("Error reading ");
>            break;
>       }
>    }
>    fclose(CheckFile);
>    exit(0);
>}
>
>
>//END SNIP
>
>You will see that we read and read and nothing gets done. This is a result 
>that I dont understand actually as it is suppose to read until EOF.
>
>I hope something makes some more sense.
>
>I am looking at the second problem will be back an about 10 minutes
>Johanens
>
>
>
>
>
>
>At 10:00 04/09/2001 +0000, you wrote:
>>Hi Johannes,
>>
>>I believe that fprintf() does move the file pointer it just looks as 
>>though it isn't, try using ftell() to print the file position.
>>
>>I believe that because there is a struct being written to the file via 
>>fread() and then a string via fprintf() this is causing the problem as 
>>you suggested.
>>
>>These functions generally should never be mixed as the problems we are 
>>seeing are caused. Also when reading files between different systems 
>>there are problems concerning the endianess (big endian/little endian) 
>>for the file, allignment, etc. For example, the allignment of an int on 
>>one machine may be different for another. One would have to define a 
>>common alligned struct for writing, similar to the way X11, sockets, and 
>>other network protocols do it.
>>
>>However, we are only using one os in this case so this shouldn't be a 
>>problem.
>>
>>I also used fgets() and feof() to test for EOF. The output is only "Hallo 
>>World", and it doesn't see the number on the next line but reports EOF.
>>
>>     char line [256];
>>     while (fgets (line, 256, fhandle) != NULL)
>>     {
>>       printf ("%s", line);
>>     }
>>
>>     if (feof (fhandle))
>>     {
>>       printf ("EOF for fhandle.\n");
>>     }
>>
>>However, I have also used fscanf()with the field specifier and the 
>>circumflex symbol to ignore upto the newline, etc. This works in certain 
>>circumstances, i.e. only when I specify two scanf() commands as opposed to one.
>>
>>     fseek (fhandle, 0L, SEEK_SET);
>>
>>     char c1[100];
>>     char c2[100];
>>     char c3[100];
>>     char c4[100];
>>     char c5[100];
>>
>>/*
>>     // doesn't work - only sees first line
>>
>>     printf ("pos %d\n", ftell (fhandle));
>>     fscanf (fhandle, "%s%s%*[^\n]%*[^'O']%s%s%s", c1, c2, c3, c4, c5);
>>     printf ("%s %s %s %s %s\n", c1, c2, c3, c4, c5);
>>     printf ("pos %d\n", ftell (fhandle));
>>*/
>>
>>     // works well
>>
>>     printf ("pos %d\n", ftell (fhandle));
>>     fscanf (fhandle, "%s%s%*[^\n]", c1, c2);
>>     printf ("%s %s\n", c1, c2);
>>
>>     fscanf (fhandle, "%*[^'O']%s%s%s", c3, c4, c5);
>>     printf ("pos %d\n", ftell (fhandle));
>>     printf ("%s %s %s\n", c3, c4, c5);
>>
>>
>>You will notice that the file position is over 200 at the end of the 
>>program. This leads me to conclude that because of the 'crap' after the 
>>first string this causes problems for the string functions, we therefore 
>>need to ignore this stuff.
>>
>>This doesn't explain why I need two fscanf()s to do this. Although I have 
>>been testing on a HPUX compiler and this should work.
>>
>>Regards,
>>
>>Michael
>>
>>
>>
>>_________________________________________________________________
>>Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
>>
>>
>>_______________________________________________
>>Dev-cpp-users mailing list
>>Dev...@li...
>>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>
>Johannes Pretorius
>(Development Department - Promed)
>
>Tel : +27 11 263-5920
>website : http://www.promed.co.za

RE: [Dev-C++] how to use strings

[Michael C. <jd...@ho...>]

Hi Johannes,

I believe that fprintf() does move the file pointer it just looks as though 
it isn't, try using ftell() to print the file position.

I believe that because there is a struct being written to the file via 
fread() and then a string via fprintf() this is causing the problem as you 
suggested.

These functions generally should never be mixed as the problems we are 
seeing are caused. Also when reading files between different systems there 
are problems concerning the endianess (big endian/little endian) for the 
file, allignment, etc. For example, the allignment of an int on one machine 
may be different for another. One would have to define a common alligned 
struct for writing, similar to the way X11, sockets, and other network 
protocols do it.

However, we are only using one os in this case so this shouldn't be a 
problem.

I also used fgets() and feof() to test for EOF. The output is only "Hallo 
World", and it doesn't see the number on the next line but reports EOF.

     char line [256];
     while (fgets (line, 256, fhandle) != NULL)
     {
       printf ("%s", line);
     }

     if (feof (fhandle))
     {
       printf ("EOF for fhandle.\n");
     }

However, I have also used fscanf()with the field specifier and the 
circumflex symbol to ignore upto the newline, etc. This works in certain 
circumstances, i.e. only when I specify two scanf() commands as opposed to 
one.

     fseek (fhandle, 0L, SEEK_SET);

     char c1[100];
     char c2[100];
     char c3[100];
     char c4[100];
     char c5[100];

/*
     // doesn't work - only sees first line

     printf ("pos %d\n", ftell (fhandle));
     fscanf (fhandle, "%s%s%*[^\n]%*[^'O']%s%s%s", c1, c2, c3, c4, c5);
     printf ("%s %s %s %s %s\n", c1, c2, c3, c4, c5);
     printf ("pos %d\n", ftell (fhandle));
*/

     // works well

     printf ("pos %d\n", ftell (fhandle));
     fscanf (fhandle, "%s%s%*[^\n]", c1, c2);
     printf ("%s %s\n", c1, c2);

     fscanf (fhandle, "%*[^'O']%s%s%s", c3, c4, c5);
     printf ("pos %d\n", ftell (fhandle));
     printf ("%s %s %s\n", c3, c4, c5);


You will notice that the file position is over 200 at the end of the 
program. This leads me to conclude that because of the 'crap' after the 
first string this causes problems for the string functions, we therefore 
need to ignore this stuff.

This doesn't explain why I need two fscanf()s to do this. Although I have 
been testing on a HPUX compiler and this should work.

Regards,

Michael



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RE: [Dev-C++] how to use strings

[Michael C. <jd...@ho...>]

Hi,

Did you get the fprintf to work because I am still having trouble.

I have also tried it at work on a HPUX 10.20 aCC compiler but neither 
version works for reading from a file.

  fprintf (stdout, "%s", fhandle);
  fprintf (stdout, "%s", *fhandle);

Note, the second version works on the Dev C++ compiler but reads the first 
line only.

And yes, I agree there are many ways to move the file pointer and that 
seeking to the end of a string is bad strategy. I was just trying to get the 
thing to read from a file using fprintf().

Michael


>From: "Ioannis Vranos" <no...@ya...>
>To: "Dev-C++" <dev...@li...>
>Subject: RE: [Dev-C++] how to use strings
>Date: Tue, 4 Sep 2001 02:13:53 +0200
>
> > -----Original Message-----
> > From: dev...@li...
> > [mailto:dev...@li...] On Behalf
> > Of Michael C
> > Sent: Monday, September 03, 2001 10:37 PM
> > To: dev...@li...
> > Subject: Re: [Dev-C++] how to use strings
> > 3) fprintf() and fscanf() do not move the file position and I
> > can't remember how to do this. So another call to fprintf()
>
>Of course they do. There are thousands of many ways to move the file
>position, fseek(), fread(), ....
>
> > will not read the stringified number on the next line. I
> > thought I could use:
> >         'fseek (fhandle, len, SEEK_CUR);' where len is the
> > returned value from a successful call to fprintf()
>
>The strategy is a mistake.
>
> >     However, this doesn't work. Instead I prefer to use:
> >
> >      int c;
> >      while ((c = fgetc (fhandle)) != EOF)
> >      {
> >            fputc (c, stdout);
> >      }
> >
>
>This works too.
>
> > Any comments?
> >
> > Hope this helps.
> >
> > Michael
>
>
>Ioannis
>
>* Ioannis Vranos
>* Programming pages: http://www.noicys.f2s.com
>* Alternative URL: http://run.to/noicys
>
>
>_______________________________________________
>Dev-cpp-users mailing list
>Dev...@li...
>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users


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Re: [Dev-C++] how to use strings

[Michael C. <jd...@ho...>]

Hi,

Yes this is how I would have done this in the past, it's just that the 
person wanted to use fprintf().

Also, I would have used stat() to obtain the size of the file unless (which 
is why you have shown this) the file is too big and you just wanted to read 
it in chunks.

Generally, (as you know) we know the size of the structs we read in so we 
would probably allocate memory for a number of structs and read that in at 
one time - whatever is more efficient for our program to do.

Michael


>From: Johannes Pretorius <joh...@pr...>
>To: "Michael C" <jd...@ho...>
>CC: dev...@li...
>Subject: Re: [Dev-C++] how to use strings
>Date: Tue, 04 Sep 2001 07:38:15 +0200
>
>Okay I dont reaaly know what You want to do. Considering you want to read
>in a structure I will say use fread !!! else try something like
>this if you want a block of data
>
>//SNIP
>
>#include <stdio.h>
>#include <fcntl.h>
>#include <alloc.h>   /* alloc.h for Borland compilers,
>                         malloc.h for Microsoft compilers */
>
>#define BUFFER_SIZE  0x8000   /* 32Kb data buffer */
>
>main(int argc, char *argv[]) {
>    int Handle;
>    unsigned int Checksum;
>    unsigned char *WorkingBuffer;
>    int WorkingLength;
>
>    if ( argc != 2 ) {
>       printf("usage: checksum filename\n");
>       exit(1);
>    }
>
>    if ( (Handle = open(argv[1], O_RDONLY | O_BINARY)) == -1 ) {
>       printf("Can't open file: %s\n", argv[1]);
>       exit(1);
>    }
>
>    /* Get memory in which to buffer the data */
>    if ( (WorkingBuffer = (unsigned char *)malloc(BUFFER_SIZE)) == NULL ) {
>       printf("Can't get enough memory\n");
>       exit(1);
>    }
>
>    /* Initialize the checksum accumulator */
>    Checksum = 0;
>
>    /* Process the file in 32Kb chunks */
>    do {
>       if ( (WorkingLength = read(Handle, WorkingBuffer,
>             BUFFER_SIZE)) == -1 ) {
>          printf("Error reading file %s\n", argv[1]);
>          exit(1);
>       }
>       /* Checksum this chunk if there's anything in it */
>       if ( WorkingLength ) {
>           //Beneath part is in assembler file. So I commented it out
>          //ChecksumChunk(WorkingBuffer, WorkingLength, &Checksum);
>       }
>    } while ( WorkingLength );
>
>    /* Report the result */
>    printf("The checksum is: %u\n", Checksum);
>
>    exit(0);
>}
>
>//END SNIP
>
>NOTE : The above code will always have a checksum of 0 as it is not calling
>the assembler function that is in a different file.
>else a more simple straight forward approach will be
>
>//SNIP
>/*
>  * Program to calculate the 16-bit checksum of the stream of bytes
>  * from the specified file. Obtains the bytes one at a time via
>  * getc(), allowing C to perform data buffering.
>  */
>#include <stdio.h>
>
>main(int argc, char *argv[]) {
>    FILE *CheckFile;
>    int Byte;
>    unsigned int Checksum;
>
>    if ( argc != 2 ) {
>       printf("usage: checksum filename\n");
>       exit(1);
>    }
>
>    if ( (CheckFile = fopen(argv[1], "rb")) == NULL ) {
>       printf("Can't open file: %s\n", argv[1]);
>       exit(1);
>    }
>
>    /* Initialize the checksum accumulator */
>    Checksum = 0;
>
>    /* Add each byte in turn into the checksum accumulator */
>    while ( (Byte = getc(CheckFile)) != EOF ) {
>       Checksum += (unsigned int) Byte;
>    }
>
>    /* Report the result */
>    printf("The checksum is: %u\n", Checksum);
>
>    exit(0);
>}
>
>//END SNIP
>
>Now this is basic stuff that I can think of right now. Futher more if you
>can give more information on what you want to achieve maybe we can help
>
>
>hope this helps
>Johannes
>
>
>
>At 21:34 03/09/2001 +0100, you wrote:
>>Hi,
>>
>>I havn't programmed in C for a couple of years now, I've been 
>>concentrating
>>on C++.
>>I have forgotten a few things so I'm watching this group for input, and 
>>I've
>>been impressed by what I have seen.
>>
>>I had a look at your code and spotted a few things:
>>
>>1) For fopen() use "w+" as you need to read it as well.
>>2) Use ' fseek (fhandle, 0L, SEEK_SET);' to reposition the file to the
>>beginning for reading.
>>3) Dereference fhandle (*fhandle) in the fprintf() statement and this will
>>read in the string.
>>3) fprintf() and fscanf() do not move the file position and I can't 
>>remember
>>how to do this. So another call to fprintf() will not read the stringified
>>number on the next line. I thought I could use:
>>         'fseek (fhandle, len, SEEK_CUR);' where len is the returned value
>>from a successful call to fprintf()
>>     However, this doesn't work. Instead I prefer to use:
>>
>>      int c;
>>      while ((c = fgetc (fhandle)) != EOF)
>>      {
>>            fputc (c, stdout);
>>      }
>>
>>Any comments?
>>
>>Hope this helps.
>>
>>Michael
>>
>>----- Original Message -----
>>From: Johannes Pretorius <joh...@pr...>
>>To: <jsc...@gm...>
>>Cc: <dev...@li...>
>>Sent: Monday, September 03, 2001 2:07 PM
>>Subject: Re: [Dev-C++] how to use strings
>>
>>
>> > this here is a simple example that will make more sense. For 
>>considering
>> > that you are trying to mix
>> > your WINAPI functions and write to the handle of the file allocators. I 
>>do
>> > not think that it is possible in
>> > the compiler version. Maybe with a Microsft compiler.
>> >
>> > else this is a VERY simple way to do it that works. I hope this help.,
>> > Please mail if I misunderstand you.
>> >
>> > file://====== SNIP =========
>> >
>> > #include <iostream.h>
>> > #include <stdio.h>
>> > #include <stdlib.h>
>> >
>> >
>> >
>> >   struct test{
>> >     char data [200];
>> >   }testdata;
>> >
>> > void main(void){
>> >   char outstring[200];
>> >   FILE *fhandle;
>> >   int actualnumber;
>> >
>> >      file://open in write mode (override if exist);
>> >      fhandle = fopen("c:\\medcelldata.txt","w");
>> > /*CreateFile("c:/medcelldata.txt",
>> >                          GENERIC_READ | GENERIC_WRITE,
>> >                          0,
>> >                          NULL,
>> >                          OPEN_ALWAYS,
>> >                          FILE_ATTRIBUTE_NORMAL,
>> >                          NULL
>> >                          );
>> >                */
>> >
>> >      if(fhandle == NULL)
>> >      {
>> >          printf("\nNO File present");
>> >      }
>> >
>> >      file://copy test to structuer
>> >      strcpy(testdata.data,"Hallo World\n");
>> >
>> >      actualnumber = 1000;
>> >
>> >      file://write using fwrite (BETTER for Structures)
>> >      fwrite(&testdata, sizeof(testdata), 1, fhandle);
>> >
>> >      file://convert integer
>> >      itoa(actualnumber, outstring, 10);
>> >
>> >      file://write with fprintf to file
>> >      fprintf(fhandle,"OutString : %s",outstring);
>> >
>> >      file://clsoe file
>> >      fclose(fhandle);
>> > }
>> >
>> >
>> >
>> >
>> > file://========= END SNIP =========
>> >
>> > Hope it helps
>> > Johannes
>> >
>> >
>> >
>> > At 14:03 03/09/2001 +0200, you wrote:
>> > >On 3 Sep 2001, at 11:57, Johannes Pretorius wrote:
>> > >
>> > > > Johannes Pretorius <joh...@pr...>
>> > >
>> > >
>> > >Here it is !  i allready change something to make it run - but in the
>> > >written file there only occurs   1- or two figures !
>> > >
>> > >How can i use the fprintf - function to access  the file ????
>> > >
>> > >
>> > >
>> > >#include <iostream.h>
>> > >#include <stdio.h>
>> > >#include <stdlib.h>
>> > >#include <windows.h>
>> > >
>> > >// vars
>> > >
>> > >HANDLE hcom;                                    // file handler
>> > >HANDLE hfile;
>> > >DWORD dwWritten;
>> > >
>> > >int value[8];
>> > >int numofdata[15] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0} ;
>> > >
>> > >BYTE noise;                                     // for testing only
>> > >BYTE activeitem;                                // no of active row
>> > >
>> > >BYTE in_buffer[35];                             // input buffer = 8
>>needed
>> > >BYTE out_buffer[35];                           // output buffer
>> > >
>> > >int writepoint;
>> > >int readpoint;
>> > >int writepointin;                               // write pos inbuffer
>> > >int readpointin;                                // read pos inbuffer
>> > >int goodvalue;
>> > >int tempvalue;
>> > >int actualnumber;
>> > >
>> > >BYTE input;
>> > >BYTE count;
>> > >int globalschleife;
>> > >LPTSTR lpMessage;
>> > >
>> > >int progmode;                                   // bin or asc
>> > >
>> > >
>> > >....
>> > >
>> > >     hfile = CreateFile("E:/medcelldata.txt",
>> > >                         GENERIC_READ | GENERIC_WRITE,
>> > >                         0,
>> > >                         NULL,
>> > >                         OPEN_ALWAYS,
>> > >                         FILE_ATTRIBUTE_NORMAL,
>> > >                         NULL
>> > >                         );
>> > >
>> > >     if(hfile == INVALID_HANDLE_VALUE)
>> > >     {
>> > >         printf("\nNO File present");
>> > >     }
>> > >
>> > >     pstr = "MedCellCom 1.2\n\n ";
>> > >     WriteFile(hfile, pstr, 16, &dwWritten, NULL);
>> > >
>> > >
>> > >     pstr = "Prozess - Protokoll vom : \n  ";
>> > >
>> > >     WriteFile(hfile, pstr, 27, &dwWritten, NULL);
>> > >
>> > >
>> > >                     itoa(actualnumber, outstring, 10);
>> > >
>> > >                     WriteFile(hfile, outstring, 10, &dwWritten, 
>>NULL);
>> > >
>> > >                     WriteFile(hfile, "456", 3, &dwWritten, NULL);
>> > >
>> > >                     printf("%d\t", dwWritten);
>> > >                     printf("%s\n", outstring);
>> > >
>> > >
>> > >
>> > >The output shows only
>> > >
>> > >     MedCellCom 1.2
>> > >
>> > >     Prozess - Protokoll vom :
>> > >2
>> > >
>> > >Where "2"  ist the actualnumber
>> > >
>> > >I do not see  the 456  test string allthoug the screen
>> > >shows  the correct outstring  and 3 chars written !
>> > >
>> > >It is a big loop, where many lines are written and
>> > >shown on the screeen  it works and the prog terminates.
>> > >
>> > >When writing only dummy strings  like explicit
>> > >"iugnuztf"  it works and show 200 lines with exactly
>> > >this text !
>> > >
>> > >????
>> >
>> >
>> > _______________________________________________
>> > Dev-cpp-users mailing list
>> > Dev...@li...
>> > https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>> >
>


_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp

Re: [Dev-C++] how to use strings

[Johannes P. <joh...@pr...>]

Okay I dont reaaly know what You want to do. Considering you want to read 
in a structure I will say use fread !!! else try something like
this if you want a block of data

//SNIP

#include <stdio.h>
#include <fcntl.h>
#include <alloc.h>   /* alloc.h for Borland compilers,
                         malloc.h for Microsoft compilers */

#define BUFFER_SIZE  0x8000   /* 32Kb data buffer */

main(int argc, char *argv[]) {
    int Handle;
    unsigned int Checksum;
    unsigned char *WorkingBuffer;
    int WorkingLength;

    if ( argc != 2 ) {
       printf("usage: checksum filename\n");
       exit(1);
    }

    if ( (Handle = open(argv[1], O_RDONLY | O_BINARY)) == -1 ) {
       printf("Can't open file: %s\n", argv[1]);
       exit(1);
    }

    /* Get memory in which to buffer the data */
    if ( (WorkingBuffer = (unsigned char *)malloc(BUFFER_SIZE)) == NULL ) {
       printf("Can't get enough memory\n");
       exit(1);
    }

    /* Initialize the checksum accumulator */
    Checksum = 0;

    /* Process the file in 32Kb chunks */
    do {
       if ( (WorkingLength = read(Handle, WorkingBuffer,
             BUFFER_SIZE)) == -1 ) {
          printf("Error reading file %s\n", argv[1]);
          exit(1);
       }
       /* Checksum this chunk if there's anything in it */
       if ( WorkingLength ) {
           //Beneath part is in assembler file. So I commented it out
          //ChecksumChunk(WorkingBuffer, WorkingLength, &Checksum);
       }
    } while ( WorkingLength );

    /* Report the result */
    printf("The checksum is: %u\n", Checksum);

    exit(0);
}

//END SNIP

NOTE : The above code will always have a checksum of 0 as it is not calling 
the assembler function that is in a different file.
else a more simple straight forward approach will be

//SNIP
/*
  * Program to calculate the 16-bit checksum of the stream of bytes
  * from the specified file. Obtains the bytes one at a time via
  * getc(), allowing C to perform data buffering.
  */
#include <stdio.h>

main(int argc, char *argv[]) {
    FILE *CheckFile;
    int Byte;
    unsigned int Checksum;

    if ( argc != 2 ) {
       printf("usage: checksum filename\n");
       exit(1);
    }

    if ( (CheckFile = fopen(argv[1], "rb")) == NULL ) {
       printf("Can't open file: %s\n", argv[1]);
       exit(1);
    }

    /* Initialize the checksum accumulator */
    Checksum = 0;

    /* Add each byte in turn into the checksum accumulator */
    while ( (Byte = getc(CheckFile)) != EOF ) {
       Checksum += (unsigned int) Byte;
    }

    /* Report the result */
    printf("The checksum is: %u\n", Checksum);

    exit(0);
}

//END SNIP

Now this is basic stuff that I can think of right now. Futher more if you 
can give more information on what you want to achieve maybe we can help


hope this helps
Johannes



At 21:34 03/09/2001 +0100, you wrote:
>Hi,
>
>I havn't programmed in C for a couple of years now, I've been concentrating
>on C++.
>I have forgotten a few things so I'm watching this group for input, and I've
>been impressed by what I have seen.
>
>I had a look at your code and spotted a few things:
>
>1) For fopen() use "w+" as you need to read it as well.
>2) Use ' fseek (fhandle, 0L, SEEK_SET);' to reposition the file to the
>beginning for reading.
>3) Dereference fhandle (*fhandle) in the fprintf() statement and this will
>read in the string.
>3) fprintf() and fscanf() do not move the file position and I can't remember
>how to do this. So another call to fprintf() will not read the stringified
>number on the next line. I thought I could use:
>         'fseek (fhandle, len, SEEK_CUR);' where len is the returned value
>from a successful call to fprintf()
>     However, this doesn't work. Instead I prefer to use:
>
>      int c;
>      while ((c = fgetc (fhandle)) != EOF)
>      {
>            fputc (c, stdout);
>      }
>
>Any comments?
>
>Hope this helps.
>
>Michael
>
>----- Original Message -----
>From: Johannes Pretorius <joh...@pr...>
>To: <jsc...@gm...>
>Cc: <dev...@li...>
>Sent: Monday, September 03, 2001 2:07 PM
>Subject: Re: [Dev-C++] how to use strings
>
>
> > this here is a simple example that will make more sense. For considering
> > that you are trying to mix
> > your WINAPI functions and write to the handle of the file allocators. I do
> > not think that it is possible in
> > the compiler version. Maybe with a Microsft compiler.
> >
> > else this is a VERY simple way to do it that works. I hope this help.,
> > Please mail if I misunderstand you.
> >
> > file://====== SNIP =========
> >
> > #include <iostream.h>
> > #include <stdio.h>
> > #include <stdlib.h>
> >
> >
> >
> >   struct test{
> >     char data [200];
> >   }testdata;
> >
> > void main(void){
> >   char outstring[200];
> >   FILE *fhandle;
> >   int actualnumber;
> >
> >      file://open in write mode (override if exist);
> >      fhandle = fopen("c:\\medcelldata.txt","w");
> > /*CreateFile("c:/medcelldata.txt",
> >                          GENERIC_READ | GENERIC_WRITE,
> >                          0,
> >                          NULL,
> >                          OPEN_ALWAYS,
> >                          FILE_ATTRIBUTE_NORMAL,
> >                          NULL
> >                          );
> >                */
> >
> >      if(fhandle == NULL)
> >      {
> >          printf("\nNO File present");
> >      }
> >
> >      file://copy test to structuer
> >      strcpy(testdata.data,"Hallo World\n");
> >
> >      actualnumber = 1000;
> >
> >      file://write using fwrite (BETTER for Structures)
> >      fwrite(&testdata, sizeof(testdata), 1, fhandle);
> >
> >      file://convert integer
> >      itoa(actualnumber, outstring, 10);
> >
> >      file://write with fprintf to file
> >      fprintf(fhandle,"OutString : %s",outstring);
> >
> >      file://clsoe file
> >      fclose(fhandle);
> > }
> >
> >
> >
> >
> > file://========= END SNIP =========
> >
> > Hope it helps
> > Johannes
> >
> >
> >
> > At 14:03 03/09/2001 +0200, you wrote:
> > >On 3 Sep 2001, at 11:57, Johannes Pretorius wrote:
> > >
> > > > Johannes Pretorius <joh...@pr...>
> > >
> > >
> > >Here it is !  i allready change something to make it run - but in the
> > >written file there only occurs   1- or two figures !
> > >
> > >How can i use the fprintf - function to access  the file ????
> > >
> > >
> > >
> > >#include <iostream.h>
> > >#include <stdio.h>
> > >#include <stdlib.h>
> > >#include <windows.h>
> > >
> > >// vars
> > >
> > >HANDLE hcom;                                    // file handler
> > >HANDLE hfile;
> > >DWORD dwWritten;
> > >
> > >int value[8];
> > >int numofdata[15] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0} ;
> > >
> > >BYTE noise;                                     // for testing only
> > >BYTE activeitem;                                // no of active row
> > >
> > >BYTE in_buffer[35];                             // input buffer = 8
>needed
> > >BYTE out_buffer[35];                           // output buffer
> > >
> > >int writepoint;
> > >int readpoint;
> > >int writepointin;                               // write pos inbuffer
> > >int readpointin;                                // read pos inbuffer
> > >int goodvalue;
> > >int tempvalue;
> > >int actualnumber;
> > >
> > >BYTE input;
> > >BYTE count;
> > >int globalschleife;
> > >LPTSTR lpMessage;
> > >
> > >int progmode;                                   // bin or asc
> > >
> > >
> > >....
> > >
> > >     hfile = CreateFile("E:/medcelldata.txt",
> > >                         GENERIC_READ | GENERIC_WRITE,
> > >                         0,
> > >                         NULL,
> > >                         OPEN_ALWAYS,
> > >                         FILE_ATTRIBUTE_NORMAL,
> > >                         NULL
> > >                         );
> > >
> > >     if(hfile == INVALID_HANDLE_VALUE)
> > >     {
> > >         printf("\nNO File present");
> > >     }
> > >
> > >     pstr = "MedCellCom 1.2\n\n ";
> > >     WriteFile(hfile, pstr, 16, &dwWritten, NULL);
> > >
> > >
> > >     pstr = "Prozess - Protokoll vom : \n  ";
> > >
> > >     WriteFile(hfile, pstr, 27, &dwWritten, NULL);
> > >
> > >
> > >                     itoa(actualnumber, outstring, 10);
> > >
> > >                     WriteFile(hfile, outstring, 10, &dwWritten, NULL);
> > >
> > >                     WriteFile(hfile, "456", 3, &dwWritten, NULL);
> > >
> > >                     printf("%d\t", dwWritten);
> > >                     printf("%s\n", outstring);
> > >
> > >
> > >
> > >The output shows only
> > >
> > >     MedCellCom 1.2
> > >
> > >     Prozess - Protokoll vom :
> > >2
> > >
> > >Where "2"  ist the actualnumber
> > >
> > >I do not see  the 456  test string allthoug the screen
> > >shows  the correct outstring  and 3 chars written !
> > >
> > >It is a big loop, where many lines are written and
> > >shown on the screeen  it works and the prog terminates.
> > >
> > >When writing only dummy strings  like explicit
> > >"iugnuztf"  it works and show 200 lines with exactly
> > >this text !
> > >
> > >????
> >
> >
> > _______________________________________________
> > Dev-cpp-users mailing list
> > Dev...@li...
> > https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> >

Re: [Dev-C++] Simple inline assembly. What am I doing wrong?

[Johannes P. <joh...@pr...>]

Lo there
========
I Believe this is something small can you give more specific error message 
or screen shot on the error
provided also your OS.  As this is not suppose to give a error even if it 
is a Windows project.
Futher after that maybe we can help you out :)..
C Ya
Johannes



At 22:52 03/09/2001 +0200, you wrote:
>I've been trying to get assembly to work in Dev-C++, but I'm desperate! 
>Here's what I tried: (replace periods at start of line with spaces)
>
>void SetMode13h()
>{
>..asm("movw %ax,0x0013");
>..asm("int $10");
>}
>
>It compiles alright, but when I call this function, I get a Windows error! 
>It seems that the first asm line is wrong, and, I'm not sure whether the 
>second line will work either! This was the idea I was trying to do (In 
>ordinary assembler)
>
>Void SetMode13h()
>{
>..asm
>..{
>....mov ax, 0x0013h
>....int 10h
>..}
>}
>
>
>Can anybody explain what's wrong with the code I wrote? And how can I fix it?
>Thanks, Leon Buikstra
>
>(If I sent this mail twice, blame chello!)
>
>_________________________________________________________________
>Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
>
>
>_______________________________________________
>Dev-cpp-users mailing list
>Dev...@li...
>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

[Dev-C++] Mailing list problem

[Ioannis V. <no...@ya...>]

I noticed today, that when i press the reply on any message of the
mailing list an email to the email address of the person posted is
prepared, instead of an email to the list. I think this is a bug that
must be fixed.
 
 
 
Regards,
Ioannis
 
* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
<http://www.noicys.f2s.com/> 
* Alternative URL: http://run.to/noicys
 

RE: [Dev-C++] Simple inline assembly. What am I doing wrong?

[Ioannis V. <no...@ya...>]

I do not know assembly (yet) but the general syntax is something like
that:

asm("modpc 0, 0, %0" : "=3Dr" (tmp));

Take a look at http://www.research.att.com/~bs/esc99.html too.

For getting windows errors 2 things are possible:

1) You do crazy things. :)
2) Windows work in protected mode, that means you can't access system
components directly. You can't draw graphics accessing the graphics card
directly for example. For this thing windows provide system calls (API)
like the Win32 API, MFC API, e.t.c.. This is the most possible cause of
your problems.

For example some time ago i was taking function pointers, assigned them
in a char * and i printed their contents in the monitor "to see how they
look like". This is possile to DOS but impossible to Windows since
memory is protected.


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys


> -----Original Message-----
> From: dev...@li...=20
> [mailto:dev...@li...] On Behalf=20
> Of Leon Buikstra
> Sent: Monday, September 03, 2001 10:53 PM
> To: dev...@li...
> Subject: [Dev-C++] Simple inline assembly. What am I doing wrong?
>=20
>=20
> I've been trying to get assembly to work in Dev-C++, but I'm=20
> desperate!=20
> Here's what I tried: (replace periods at start of line with spaces)
>=20
> void SetMode13h()
> {
> ..asm("movw %ax,0x0013");
> ..asm("int $10");
> }
>=20
> It compiles alright, but when I call this function, I get a=20
> Windows error!=20
> It seems that the first asm line is wrong, and, I'm not sure=20
> whether the=20
> second line will work either! This was the idea I was trying=20
> to do (In=20
> ordinary assembler)
>=20
> Void SetMode13h()
> {
> ..asm
> ..{
> ....mov	ax, 0x0013h
> ....int	10h
> ..}
> }
>=20
>=20
> Can anybody explain what's wrong with the code I wrote? And=20
> how can I fix=20
> it?
> Thanks, Leon Buikstra
>=20
> (If I sent this mail twice, blame chello!)
>=20
> _________________________________________________________________
> Get your FREE download of MSN Explorer at=20
> http://explorer.msn.com/intl.asp
>=20
>=20
>=20
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>=20

RE: [Dev-C++] how to use strings

[Ioannis V. <no...@ya...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Michael C
> Sent: Monday, September 03, 2001 10:37 PM
> To: dev...@li...
> Subject: Re: [Dev-C++] how to use strings
> 3) fprintf() and fscanf() do not move the file position and I 
> can't remember how to do this. So another call to fprintf() 

Of course they do. There are thousands of many ways to move the file
position, fseek(), fread(), ....

> will not read the stringified number on the next line. I 
> thought I could use:
>         'fseek (fhandle, len, SEEK_CUR);' where len is the 
> returned value from a successful call to fprintf()

The strategy is a mistake.

>     However, this doesn't work. Instead I prefer to use:
> 
>      int c;
>      while ((c = fgetc (fhandle)) != EOF)
>      {
>            fputc (c, stdout);
>      }
> 

This works too.

> Any comments?
> 
> Hope this helps.
> 
> Michael


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys

[Dev-C++] Simple inline assembly. What am I doing wrong?

[Leon B. <bo...@ho...>]

I've been trying to get assembly to work in Dev-C++, but I'm desperate! 
Here's what I tried: (replace periods at start of line with spaces)

void SetMode13h()
{
..asm("movw %ax,0x0013");
..asm("int $10");
}

It compiles alright, but when I call this function, I get a Windows error! 
It seems that the first asm line is wrong, and, I'm not sure whether the 
second line will work either! This was the idea I was trying to do (In 
ordinary assembler)

Void SetMode13h()
{
..asm
..{
....mov	ax, 0x0013h
....int	10h
..}
}


Can anybody explain what's wrong with the code I wrote? And how can I fix 
it?
Thanks, Leon Buikstra

(If I sent this mail twice, blame chello!)

_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp

Re: [Dev-C++] how to use strings

[Michael C <jd...@ho...>]

Hi,

I havn't programmed in C for a couple of years now, I've been concentrating
on C++.
I have forgotten a few things so I'm watching this group for input, and I've
been impressed by what I have seen.

I had a look at your code and spotted a few things:

1) For fopen() use "w+" as you need to read it as well.
2) Use ' fseek (fhandle, 0L, SEEK_SET);' to reposition the file to the
beginning for reading.
3) Dereference fhandle (*fhandle) in the fprintf() statement and this will
read in the string.
3) fprintf() and fscanf() do not move the file position and I can't remember
how to do this. So another call to fprintf() will not read the stringified
number on the next line. I thought I could use:
        'fseek (fhandle, len, SEEK_CUR);' where len is the returned value
from a successful call to fprintf()
    However, this doesn't work. Instead I prefer to use:

     int c;
     while ((c = fgetc (fhandle)) != EOF)
     {
           fputc (c, stdout);
     }

Any comments?

Hope this helps.

Michael


----- Original Message -----
From: Johannes Pretorius <joh...@pr...>
To: <dev...@li...>
Sent: Monday, September 03, 2001 10:57 AM
Subject: Re: [Dev-C++] how to use strings


> Do you have some example code. for it seems you know what you want to do
> and have the right functions but something else is wrong. Please give a
> simple app or
> something that you wrote that gives this same problem and we can look at
> it.  Futher we can
> only specilate as we dont really know the actual source of the problems
and
> the coding style or mixture being used
>
> Hope we can Help
> Johannes
>
>
> At 11:25 03/09/2001 +0200, you wrote:
> >hi, i am trying to convert a simple integer or byte or anything else
> >to a string in order to write to a file on disk.
> >
> >It does not work the way i did it for years with e.g. Microsoft C7.0
> >(Win3.1) and Visual C 6.0 (W32) -  dont know why.
> >
> >a)
> >How do i convert a number liek eg   int a = -105  to exactly ythis
> >string ?
> >
> >
> >b) Which function would be the best to write and read the correct
> >format fomr and to HD-Files ?
> >
> >I used to apply fprintf with formatted strings to read full lines of a
file
> >with known structure and directly obtained  the desired variables.
> >
> >I copied the source code from a DOS prog and DEV C compiles
> >but reads only shit !
> >
> >Sorry for that, but I am going to get upset with this compiler.
> >
> >Does any body have an example wich directly works in DEV CPP
> >to find out where the problem is ?
> >
> >thanks in progress.
> >...............
> >
> >
> >_______________________________________________
> >Dev-cpp-users mailing list
> >Dev...@li...
> >https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>
>
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>

Re: [Dev-C++] how to use strings

[Johannes P. <joh...@pr...>]

this here is a simple example that will make more sense. For considering 
that you are trying to mix
your WINAPI functions and write to the handle of the file allocators. I do 
not think that it is possible in
the compiler version. Maybe with a Microsft compiler.

else this is a VERY simple way to do it that works. I hope this help.,
Please mail if I misunderstand you.

//====== SNIP =========

#include <iostream.h>
#include <stdio.h>
#include <stdlib.h>



  struct test{
    char data [200];
  }testdata;

void main(void){
  char outstring[200];
  FILE *fhandle;
  int actualnumber;

     //open in write mode (override if exist);
     fhandle = fopen("c:\\medcelldata.txt","w"); 
/*CreateFile("c:/medcelldata.txt",
                         GENERIC_READ | GENERIC_WRITE,
                         0,
                         NULL,
                         OPEN_ALWAYS,
                         FILE_ATTRIBUTE_NORMAL,
                         NULL
                         );
               */

     if(fhandle == NULL)
     {
         printf("\nNO File present");
     }

     //copy test to structuer
     strcpy(testdata.data,"Hallo World\n");

     actualnumber = 1000;

     //write using fwrite (BETTER for Structures)
     fwrite(&testdata, sizeof(testdata), 1, fhandle);

     //convert integer
     itoa(actualnumber, outstring, 10);

     //write with fprintf to file
     fprintf(fhandle,"OutString : %s",outstring);

     //clsoe file
     fclose(fhandle);
}




//========= END SNIP =========

Hope it helps
Johannes



At 14:03 03/09/2001 +0200, you wrote:
>On 3 Sep 2001, at 11:57, Johannes Pretorius wrote:
>
> > Johannes Pretorius <joh...@pr...>
>
>
>Here it is !  i allready change something to make it run - but in the
>written file there only occurs   1- or two figures !
>
>How can i use the fprintf - function to access  the file ????
>
>
>
>#include <iostream.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <windows.h>
>
>// vars
>
>HANDLE hcom;                                    // file handler
>HANDLE hfile;
>DWORD dwWritten;
>
>int value[8];
>int numofdata[15] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0} ;
>
>BYTE noise;                                     // for testing only
>BYTE activeitem;                                // no of active row
>
>BYTE in_buffer[35];                             // input buffer = 8 needed
>BYTE out_buffer[35];                           // output buffer
>
>int writepoint;
>int readpoint;
>int writepointin;                               // write pos inbuffer
>int readpointin;                                // read pos inbuffer
>int goodvalue;
>int tempvalue;
>int actualnumber;
>
>BYTE input;
>BYTE count;
>int globalschleife;
>LPTSTR lpMessage;
>
>int progmode;                                   // bin or asc
>
>
>....
>
>     hfile = CreateFile("E:/medcelldata.txt",
>                         GENERIC_READ | GENERIC_WRITE,
>                         0,
>                         NULL,
>                         OPEN_ALWAYS,
>                         FILE_ATTRIBUTE_NORMAL,
>                         NULL
>                         );
>
>     if(hfile == INVALID_HANDLE_VALUE)
>     {
>         printf("\nNO File present");
>     }
>
>     pstr = "MedCellCom 1.2\n\n ";
>     WriteFile(hfile, pstr, 16, &dwWritten, NULL);
>
>
>     pstr = "Prozess - Protokoll vom : \n  ";
>
>     WriteFile(hfile, pstr, 27, &dwWritten, NULL);
>
>
>                     itoa(actualnumber, outstring, 10);
>
>                     WriteFile(hfile, outstring, 10, &dwWritten, NULL);
>
>                     WriteFile(hfile, "456", 3, &dwWritten, NULL);
>
>                     printf("%d\t", dwWritten);
>                     printf("%s\n", outstring);
>
>
>
>The output shows only
>
>     MedCellCom 1.2
>
>     Prozess - Protokoll vom :
>2
>
>Where "2"  ist the actualnumber
>
>I do not see  the 456  test string allthoug the screen
>shows  the correct outstring  and 3 chars written !
>
>It is a big loop, where many lines are written and
>shown on the screeen  it works and the prog terminates.
>
>When writing only dummy strings  like explicit
>"iugnuztf"  it works and show 200 lines with exactly
>this text !
>
>????

Re: [Dev-C++] how to use strings

[Johannes P. <joh...@pr...>]

Do you have some example code. for it seems you know what you want to do
and have the right functions but something else is wrong. Please give a 
simple app or
something that you wrote that gives this same problem and we can look at 
it.  Futher we can
only specilate as we dont really know the actual source of the problems and 
the coding style or mixture being used

Hope we can Help
Johannes


At 11:25 03/09/2001 +0200, you wrote:
>hi, i am trying to convert a simple integer or byte or anything else
>to a string in order to write to a file on disk.
>
>It does not work the way i did it for years with e.g. Microsoft C7.0
>(Win3.1) and Visual C 6.0 (W32) -  dont know why.
>
>a)
>How do i convert a number liek eg   int a = -105  to exactly ythis
>string ?
>
>
>b) Which function would be the best to write and read the correct
>format fomr and to HD-Files ?
>
>I used to apply fprintf with formatted strings to read full lines of a file
>with known structure and directly obtained  the desired variables.
>
>I copied the source code from a DOS prog and DEV C compiles
>but reads only shit !
>
>Sorry for that, but I am going to get upset with this compiler.
>
>Does any body have an example wich directly works in DEV CPP
>to find out where the problem is ?
>
>thanks in progress.
>...............
>
>
>_______________________________________________
>Dev-cpp-users mailing list
>Dev...@li...
>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

[Dev-C++] how to use strings

[JS <jsc...@gm...>]

hi, i am trying to convert a simple integer or byte or anything else 
to a string in order to write to a file on disk.

It does not work the way i did it for years with e.g. Microsoft C7.0 
(Win3.1) and Visual C 6.0 (W32) -  dont know why.

a)
How do i convert a number liek eg   int a = -105  to exactly ythis 
string ?


b) Which function would be the best to write and read the correct 
format fomr and to HD-Files ?

I used to apply fprintf with formatted strings to read full lines of a file 
with known structure and directly obtained  the desired variables.

I copied the source code from a DOS prog and DEV C compiles 
but reads only shit !

Sorry for that, but I am going to get upset with this compiler.

Does any body have an example wich directly works in DEV CPP 
to find out where the problem is ?

thanks in progress.
...............
 

[Dev-C++] HELP

[lavi <jl...@ne...>]

I Want to unsubscribe HELP HELP
Please no more WEB ADD or explanasions
Just baill me out

Re: [Dev-C++] About MINGW32 3.x

[Elias P. <eli...@ao...>]

Message> about MINGW 3.x.. I searched a bit on the web and came up with this:
>
> FROM: yahoo.co.nz
> DATE: 08/30/2001 14:37:33
> SUBJECT: RE:  [Mingw-users] status of mingw using gcc 3.0.1 

You can subscribe to the mingw mailing list at www.mingw.org, or view
the complete archives there (including the thread you mention).

--
Elias Pschernig

[Dev-C++] About MINGW32 3.x

[Ioannis V. <no...@ya...>]

To anyone concerning about MINGW 3.x.. I searched a bit on the web and
came up with this:
=20
FROM: yahoo.co.nz
DATE: 08/30/2001 14:37:33
SUBJECT: RE:  [Mingw-users] status of mingw using gcc 3.0.1=20

 =20



 --- kevin1 <
<http://www.geocrawler.com/contact.php3?to=...@ch...=
g
s_p_a_m> <EMAIL: PROTECTED>> wrote: > I'm just wondering what

the status of gcc 3.0.1 support with mingw

> is.  I'm

> kinda a newbie to the whole business, but I note that the latest

> version is

> using 2.95.3.  Any timeframe on the inclusion of 3.0.1?

>=20



When its ready. =20



GCC 3.0.1 builds with mingw host and target - after patching with Mumit

Khan's patchset for 3.0.  But there are two serious problems, still

with 3.0.1 as with 3.0.



1) Dll support for C++ classes is broken.

2) Iostream component of libstdc++ has bugs (cin doesn't work).



The first one is a biggy and derives from basic changes in the way

attributes are being handled in Gcc 3.x.  The second one has a

workaround until it is fixed properly - use the STLport iostream lib

which has better support for native w32 IO and  also has some native

locale support.=20



I'll keep working on it, but right now it is not high priority.



Regards



Danny
=20
This means it will take probably much time till we see 3.x and we are
stuck with 2.9.x. till that time.
=20
=20
=20
Keep coding,
Ioannis
=20
* Ioannis Vranos
* Programming pages:  <http://www.noicys.f2s.com/>
http://www.noicys.f2s.com
* Alternative URL:  <http://run.to/noicys> http://run.to/noicys

Re: [Dev-C++] Problem with Writefile

[Luigi S. <gi...@li...>]

Hello J.Schuhmacher,

I would like to help you but I don't know what the "WriteFile" is, maybe it 
is some ANSI C/C++ function that I'm missing?

Please let me know.


If you wish to convert an integer into a string you could use the function 
"itoa" (Integer TO Array).

I've found such a function in the file "stdlib.h" shipped with the mingw 
compiler (or with Dev-C++)
but as far as I remember "itoa" is not an ANSI-C function (of course I may 
be wrong), so if portability is important to you I  suggest you not use it.

I use instead a version of "itoa" that can be found at 
www.geocities.com/gisan1/src_fram.htm/

Hope this helps

At 17.22 31/08/01 +0200, you wrote:

>Hello, i am using the writefile to place strings into a textfile from a
>consol app !
>
>The following works normally
>
>char *pstr;
>pstr = "Prozess - Protokoll \n  ";
>WriteFile(hfile, pstr, 25, &dwWritten, NULL);
>
>And I also can write value of e.g.   "int a" by
>
>WriteFile(hfile, &a, 1, &dwWritten, NULL);
>
>
>But it appears as one byte only - unreadable in text browser.
>
>Now, how can I write it in ASCII - ?
>
>How CAN I convert an e.g. integer to a string ?
>
>I remember from DOS Programming, there was a function.
>
>thanks for a hint
>
>j.s.
>
>
>
>
>
>----------------
>J.Schuhmacher
>jsc...@gm...
>
>_______________________________________________
>Dev-cpp-users mailing list
>Dev...@li...
>http://lists.sourceforge.net/lists/listinfo/dev-cpp-users

--
gisan
gi...@li...

Re: [Dev-C++] Problem with Writefile

[Anton T. <ant...@ch...>]

hi,

there are several ways to convert an integer to a string, for example

  char s[80];
  int i;

  i = 123;
  sprintf(s, "the value of i is: %d\n", i);

this copies the text "the value .." to s, and then replaces the "%d" with a
string representing i. if you want only the integer to appear in the string,
you can remove the rest of the so-called format string and just write

  sprintf(s, "%d", i)

s should be "123", then.

you may also concatenate more than one argument:


  sprintf(s, "i: %d; j: %d", i, j);

bye,

anti.


----- Original Message -----
From: JS <jsc...@gm...>
To: <dev...@li...>
Sent: Friday, August 31, 2001 5:22 PM
Subject: [Dev-C++] Problem with Writefile


>
> Hello, i am using the writefile to place strings into a textfile from a
> consol app !
>
> The following works normally
>
> char *pstr;
> pstr = "Prozess - Protokoll \n  ";
> WriteFile(hfile, pstr, 25, &dwWritten, NULL);
>
> And I also can write value of e.g.   "int a" by
>
> WriteFile(hfile, &a, 1, &dwWritten, NULL);
>
>
> But it appears as one byte only - unreadable in text browser.
>
> Now, how can I write it in ASCII - ?
>
> How CAN I convert an e.g. integer to a string ?
>
> I remember from DOS Programming, there was a function.
>
> thanks for a hint
>
> j.s.
>
>
>
>
>
> ----------------
> J.Schuhmacher
> jsc...@gm...
>
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> http://lists.sourceforge.net/lists/listinfo/dev-cpp-users

[Dev-C++] HELP HELP

[lavi <jl...@ne...>]

  ----- Original Message -----=20
  From: lavi=20
  To: dev...@li...=20
  Sent: Wednesday, August 29, 2001 11:14 PM
  Subject: Re: [Dev-C++] Re: Dev-cpp-users digest, Vol 1 #397 - 5 msgs


  HELP I am traying to UNSUBSCRIBE for weeks
  Yhanks
    ----- Original Message -----=20
    From: nishikant deshmukh=20
    To: dev...@li...=20
    Sent: Wednesday, August 29, 2001 4:05 PM
    Subject: [Dev-C++] Re: Dev-cpp-users digest, Vol 1 #397 - 5 msgs


    remove me=20


      dev...@li... wrote:=20

      Send Dev-cpp-users mailing list submissions to
      dev...@li...

      To subscribe or unsubscribe via the World Wide Web, visit
      http://lists.sourceforge.net/lists/listinfo/dev-cpp-users
      or, via email, send a message with subject or body 'help' to
      dev...@li...

      You can reach the person managing the list at
      dev...@li...

      When replying, please edit your Subject line so it is more =
specific
      than "Re: Contents of Dev-cpp-users digest..."


      Today's Topics:

      1. (no subject) (=3D?iso-8859-2?Q?Ivan_Ganick=3DFD?=3D)
      2. strftime and << binaries (float) (JohnG)
      3. blocking user's access (Alex Badiu)
      4. Re: Dev-c++ and array ! (Luigi Santillo)
      5. Re: Dev-cpp-users digest, Vol 1 #396 - 1 msg (nishikant =
deshmukh)

      --__--__--

      Message: 1
      From: =3D?iso-8859-2?Q?Ivan_Ganick=3DFD?=3D=20
      To:=20
      Date: Mon, 27 Aug 2001 23:03:33 +0200
      Subject: [Dev-C++] (no subject)
      Reply-To: dev...@li...

      This is a multi-part message in MIME format.

      ------=3D_NextPart_000_0026_01C12F4C.7EB510A0
      Content-Type: text/plain;
      charset=3D"iso-8859-2"
      Content-Transfer-Encoding: quoted-printable



      ------=3D_NextPart_000_0026_01C12F4C.7EB510A0
      Content-Type: text/html;
      charset=3D"iso-8859-2"
      Content-Transfer-Encoding: quoted-printable



      charset=3D3Diso-8859-2">








      ------=3D_NextPart_000_0026_01C12F4C.7EB510A0--



      --__--__--

      Message: 2
      From: "JohnG"=20
      To: "DEVCPP_List"=20
      Date: Mon, 27 Aug 2001 18:08:03 -0500
      Subject: [Dev-C++] strftime and << binaries (float)
      Reply-To: dev...@li...

      Has anyone attempted to put a strftime string along with a float =
on the =3D
      same line? I'm attempting to use a string output from the strftime =
=3D
      function and also a float together. I get error messages stating =
that =3D
      the float cannot be joined with the string. =3D20

      John Garrison


      _________________________________________________________
      Do You Yahoo!?
      Get your free @yahoo.com address at http://mail.yahoo.com



      --__--__--

      Message: 3
      Date: Mon, 27 Aug 2001 20:57:23 +0300
      From: Alex Badiu=20
      To: Dev-C++ List=20
      Subject: [Dev-C++] blocking user's access
      Reply-To: dev...@li...


      --------------953F0CFEB40E4B159A352973
      Content-Type: text/plain; charset=3Diso-8859-2
      Content-Transfer-Encoding: 7bit

      Hello.
      I want to make a program that blocks the access to a PC unless a
      password is provided. The thing is that I don't know how. I've =
seen
      something that went fullscreen and in one corner there was a small =
login
      box with the user and password fields. Wasn't DirectX or anything =
like
      that. Just GDI. Alt-TAB wasn't working and when doing Ctrl-Alt-Del =
the
      program wasn't in the Close program list.
      Does anyone have a clue about how would I do this?
      Thanks in advance.

      Alex Badiu
      http://www.badiu.net
      http://queen.badiu.net

      --------------953F0CFEB40E4B159A352973
      Content-Type: text/html; charset=3Diso-8859-2
      Content-Transfer-Encoding: 7bit



          Hello.

          I want to make
      a program that blocks the access to a PC unless a password is =
provided.
      The thing is that I don't know how. I've seen something that went =
fullscreen
      and in one corner there was a small login box with the user and =
password
      fields. Wasn't DirectX or anything like that. Just GDI. Alt-TAB =
wasn't
      working and when doing Ctrl-Alt-Del the program wasn't in the =
Close program
      list.

          Does anyone have
      a clue about how would I do this?

          Thanks in advance.

          Alex Badiu

          http://www.badiu.net

          http://queen.badiu.net

      --------------953F0CFEB40E4B159A352973--



      _________________________________________________________
      Do You Yahoo!?
      Get your free @yahoo.com address at http://mail.yahoo.com



      --__--__--

      Message: 4
      Date: Mon, 27 Aug 2001 08:26:39 +0200
      To: dev...@li...
      From: Luigi Santillo=20
      Subject: Re: [Dev-C++] Dev-c++ and array !
      Reply-To: dev...@li...

      Hi!

      Sorry, my answer was a little confusing, I wrote it after =
compiling this=20
      small example:

      test.c
      ------
      =
/*********************************************************************

      test things like: int tab[10, 2]

      =
*********************************************************************/
      #include=20

      void
      print_arr(const int *, int);

      =
/********************************************************************/

      int
      main()
      {
      int x;
      int tab[10, 2];

      x =3D 1, printf("x =3D %d\n", x);

      tab[0] =3D 1;
      tab[1] =3D 10;
      print_arr(tab, 2);

      return 0;
      }

      =
/********************************************************************/

      void
      print_arr(const int *arr, int n)
      {
      int i;

      for(i =3D 0; i < n; i++)
      printf("arr[%d] =3D %d\n", i, arr[i]);
      }

      ---

      When you compile it you should see the message:
      test.c:17: warning left-hand operand of comma has no effect

      So "do something with 10 (actually nothing)" was my pesonal =
translation
      of the above warning message. :-)


      At 15.03 26/08/01 +0200, you wrote:
      > > In the same fashion, the "int Tab[10, 2]" means: do "something =
with 10"
      > > (actually nothing) and allocate memory (in static sense) for =
an array of 2
      > > integers.
      >
      >Do something with 10 ? Doing what ?
      >
      >
      >_______________________________________________
      >Dev-cpp-users mailing list
      >Dev...@li...
      >http://lists.sourceforge.net/lists/listinfo/dev-cpp-users

      --
      gisan
      gi...@li...



      --__--__--

      Message: 5
      Date: Mon, 27 Aug 2001 22:38:09 -0700 (PDT)
      From: nishikant deshmukh=20
      To: dev...@li...
      Subject: [Dev-C++] Re: Dev-cpp-users digest, Vol 1 #396 - 1 msg
      Reply-To: dev...@li...

      --0-1804528721-998977089=3D:30937
      Content-Type: text/plain; charset=3Dus-ascii


      remove me.
      dev...@li... wrote: Send =
Dev-cpp-users mailing list submissions to
      dev...@li...

      To subscribe or unsubscribe via the World Wide Web, visit
      http://lists.sourceforge.net/lists/listinfo/dev-cpp-users
      or, via email, send a message with subject or body 'help' to
      dev...@li...

      You can reach the person managing the list at
      dev...@li...

      When replying, please edit your Subject line so it is more =
specific
      than "Re: Contents of Dev-cpp-users digest..."


      Today's Topics:

      1. RE: Pointer Resourses (Ioannis Vranos)

      -- __--__--=20

      Message: 1
      From: "Ioannis Vranos"=20
      To:=20
      Subject: RE: [Dev-C++] Pointer Resourses
      Date: Mon, 27 Aug 2001 16:39:20 +0200
      Reply-To: dev...@li...

      You forgot to mention the phrase "second edition". :)


      Ioannis

      * Ioannis Vranos
      * Programming pages: http://www.noicys.f2s.com
      * Alternative URL: http://run.to/noicys


      > -----Original Message-----
      > From: dev...@li...=3D20
      > [mailto:dev...@li...] On Behalf Of =
bretek
      > Sent: Monday, August 27, 2001 1:00 PM
      > To: cha...@ho...
      > Cc: dev...@li...
      > Subject: RE: [Dev-C++] Pointer Resourses
      >=3D20
      >=3D20
      > Hello!
      >=3D20
      > Pointer is a datatype that's value is a memory address.
      > It is necessary in C programming because C is a pointer=3D20
      > oriented language. In addition it is very useful in=3D20
      > handling of trees, lists etc.
      > A VERY useful book (not only for you but for all C=3D20
      > programmers) :
      > Kernighan,Brian W. ; Ritchie, Dennis M. : "The C=3D20
      > programming language."
      >=3D20
      >=3D20
      >=3D20
      > _______________________________________________
      > Dev-cpp-users mailing list
      > Dev...@li...
      > http://lists.sourceforge.net/lists/listinfo/dev-cpp-users
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      remove me.


        dev...@li... wrote:=20


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        Today's Topics:

        1. RE: Pointer Resourses (Ioannis Vranos)

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        Message: 1
        From: "Ioannis Vranos"=20
        To:=20
        Subject: RE: [Dev-C++] Pointer Resourses
        Date: Mon, 27 Aug 2001 16:39:20 +0200
        Reply-To: dev...@li...

        You forgot to mention the phrase "second edition". :)


        Ioannis

        * Ioannis Vranos
        * Programming pages: http://www.noicys.f2s.com
        * Alternative URL: http://run.to/noicys


        > -----Original Message-----
        > From: dev...@li...=3D20
        > [mailto:dev...@li...] On Behalf =
Of bretek
        > Sent: Monday, August 27, 2001 1:00 PM
        > To: cha...@ho...
        > Cc: dev...@li...
        > Subject: RE: [Dev-C++] Pointer Resourses
        >=3D20
        >=3D20
        > Hello!
        >=3D20
        > Pointer is a datatype that's value is a memory address.
        > It is necessary in C programming because C is a pointer=3D20
        > oriented language. In addition it is very useful in=3D20
        > handling of trees, lists etc.
        > A VERY useful book (not only for you but for all C=3D20
        > programmers) :
        > Kernighan,Brian W. ; Ritchie, Dennis M. : "The C=3D20
        > programming language."
        >=3D20
        >=3D20
        >=3D20
        > _______________________________________________
        > Dev-cpp-users mailing list
        > Dev...@li...
        > http://lists.sourceforge.net/lists/listinfo/dev-cpp-users
        >=3D20




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[Dev-C++] Problem with Writefile

[JS <jsc...@gm...>]

Hello, i am using the writefile to place strings into a textfile from a 
consol app !

The following works normally 

char *pstr;
pstr = "Prozess - Protokoll \n  ";
WriteFile(hfile, pstr, 25, &dwWritten, NULL);

And I also can write value of e.g.   "int a" by 

WriteFile(hfile, &a, 1, &dwWritten, NULL);


But it appears as one byte only - unreadable in text browser.

Now, how can I write it in ASCII - ?

How CAN I convert an e.g. integer to a string ?

I remember from DOS Programming, there was a function.

thanks for a hint

j.s.





----------------
J.Schuhmacher
jsc...@gm...