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 !
>
>????