dev-cpp-users — Dev-C++ users discussion list

Re: [Dev-C++] C validating user input

[Daniel K. O. <dan...@ya...>]

Dane Ensign wrote:

> What is the safest approach?

(...)

> int Num;
> printf("Enter a value between 0 and 18: ");
> scanf("%d", &Num);
>
> if(Num > 0 && Num <= 18)...
>
> but that makes the app go nuts if they enter: '.4' or something stupid 
> like that.


Read the scanf() documentation to see what the returned value means. 
It's enough for your simple input.


Daniel K. O.

[Dev-C++] C validating user input

[Dane E. <dg...@wo...>]

Hi all,

Using 'C' I need to prompt the user to enter an integer. Then I need to 
check if it is between 0-18.
What is the safest approach?


I tried:

int Num;
printf("Enter a value between 0 and 18: ");
scanf("%d", &Num);

if(Num > 0 && Num <= 18)...

but that makes the app go nuts if they enter: '.4' or something stupid 
like that.

Thank you in advance for any help you can offer.

Dane

Re: [Dev-C++] hex edit wrapper

[Daniel K. O. <dan...@ya...>]

Big Playah wrote:

>Any open source hex editors I could take a
>look at (looked for, but haven't found one) ?
>  
>
Search a bit on Sourceforge.net and you'll find some. "hex editor" is a 
good search string for this, make sure to activate the "Require All 
Words" option.


Daniel K. O.

[Dev-C++] hex edit wrapper

[Big P. <big...@gm...>]

Hi,

I'm developing a program which will utilize multiple hex editing
windows. Is there any good stuff around for this, or do I have to code
everything myself, based on a simple text edit window (which is not a
problem, just trying to save time) ?
what is the best strategy, shall I go for expanding the source with
spaces and jump over those, or shall I go for something that displays
the source how it should? Any open source hex editors I could take a
look at (looked for, but haven't found one) ?
I've noticed scintilla, which is something like what I need, but it's
not exactly what I'm looking for...
tia,

tom

-- 
Coupe Quattro '89
Typ81 custom '84

Re: [Dev-C++] Problem with binary write to a file

[Marek J. <sp...@we...>]

 >   file=fopen("PB.DAT", "w");

what happens when you do
    file=fopen("PB.DAT", "wb");
?

--
Marek

[Dev-C++] Problem with binary write to a file

[<SAL...@me...>]

Hello,

I've found a very strange behaviour of the fwrite and fputc function.
When I write the "0x0A" character, the function add a "0x0D" character
also.
This is very obvious when you want to write binary values !!!

Can someone help me ?

Here is a very small fonction that show the pb :

Thanks,
St=E9phane.

#include <stdio.h>
#include <string.h>


void show_pb_write()
{
  FILE *file;
  char buf[10];
  int i;

  buf[0]=3D0x01;
  buf[1]=3D0x02;
  buf[2]=3D0x0A;
  buf[3]=3D0x0A;

  file=3Dfopen("PB.DAT", "w");
  for (i=3D0;i<4;i++)
    {
    fputc(buf[i],file);
    }

  fwrite(buf,1,4,file);
  fclose(file);

}

Instead of writing 8 characters, the file created has 12 characters.
=

Re: [Dev-C++] Networking headers

[Per W. <pw...@ia...>]

Don't confuse Unix networks programming with Windows networks programming.

Google for Winsock programming.

/Per W

On Mon, 14 Mar 2005 Rub...@al... wrote:

> Hello all.
>
> I have not experience programming with sockets and I would like to start
> it. So, could anyone tell me from where can I download networking headers
> files?.
>
> For example:
>         /sys/socket
>         /netinet/ip.h
>         /netinet/in.h
>
> Thanks a lot.
>
> Ruben Savia
> Ingeniero Electr=F3nico
> Datacom Services
> eBD - eBusiness Division
> Alcatel de Argentina S.A.
>
> e-mail : rub...@al...
>
> Phone:    5411 4349 - 1111 ext.1001
> Fax:         5411 4349 - 1199
> Alcanet  : 2930-1001
> Web site: www.ind.alcatel.com
>

[Dev-C++] Networking headers

[<Rub...@al...>]

Hello all.

I have not experience programming with sockets and I would like to start=20
it. So, could anyone tell me from where can I download networking headers=20
files?.=20

For example:
        /sys/socket
        /netinet/ip.h
        /netinet/in.h

Thanks a lot.

Ruben Savia
Ingeniero Electr=F3nico
Datacom Services
eBD - eBusiness Division
Alcatel de Argentina S.A.

e-mail : rub...@al...=20

Phone:    5411 4349 - 1111 ext.1001
Fax:         5411 4349 - 1199
Alcanet  : 2930-1001
Web site: www.ind.alcatel.com=20

[Dev-C++] opening a file in the environment

[gpuime <gp...@pa...>]

Hello you all,
	I'm still using version 4.0 and I can't make the program under 
development to open a text file (I always get a null pointer). And yet 
the executable opens that file. Is this a bug in this version oris it a 
configuration problem?
Puime

Re: [Dev-C++] PlaySound() Help

[tichy <akr...@op...>]

----- Original Message ----- 
From: "Jarren Long" <vb...@gm...>
To: <dev...@li...>
Sent: Monday, March 14, 2005 5:46 AM
Subject: [Dev-C++] PlaySound() Help
> PlaySond() info and how to use it?
>

sndPlaySound(TEXT(myFile.wav), SND_FILENAME|SND_ASYNC);
I don't remember whitch header (mmsystem.h ?), look at Microsoft info on
multimedia functions

[Dev-C++] PlaySound() Help

[Jarren L. <vb...@gm...>]

plain Thx everyone for the help. I think it's just my computer, it's
not working right.

I'm using the MingW library, so where would I go to find the
PlaySond() info and how to use it?

[Dev-C++] thx

[Big P. <big...@gm...>]

Hi,

alfred, tichx, thx xour answers. reducing tab seems to easy my #2 problem.
I must have been wrong thinking the resource tab (yes, next to the
compiler) is for browsing resources.

tom

-- 
Coupe Quattro '89
Typ81 custom '84

Re: [Dev-C++] can't make MessageBeep() beep!

[Verne H. B. <ve...@sy...>]

I just added your little Beep program and left the system("PAUSE"); in same 
and got a nice kerjunk! sound!  I don't know what you were expecting with 
that little bit of code.
********************
#include <cstdlib>
#include <iostream>
#include "windows.h"
using namespace std;

int main(int argc, char *argv[])
{
    MessageBeep(128);

       // return 0;

    system("PAUSE");
    return EXIT_SUCCESS;
}
****************************
Verne


> OK, I feel really stupid right now. I'm making a console game(or
> starting to), and I want the console to beep certain sounds to make a
> sort of old-style song. I've been testing the messageBeep for hours
> now, and I can't get it to work. Here's a sample of what I've written:
>
> #include "windows.h"
>
> int main()
>    {
>        MessageBeep(128);
>        return 0;
>    }
>
> When I compile the program, it runs fine, but all it does is make a
> "click" sound, not a beep. What's going on?
>
>
> -------------------------------------------------------
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Re: [Dev-C++] can't make MessageBeep() beep!

[tichy <ti...@po...>]

Jarren Long wrote:
> "click" sound, not a beep. What's going on?
it hangs on what is set in system sound preferences under Win*
U should better use PlaySound() with *.wav files
to make use of computer speaker use asembler functions with interrupts.

Andrzej Krynski
http:\\tichy.fm.interia.pl


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[Dev-C++] can't make MessageBeep() beep!

[Jarren L. <vb...@gm...>]

OK, I feel really stupid right now. I'm making a console game(or
starting to), and I want the console to beep certain sounds to make a
sort of old-style song. I've been testing the messageBeep for hours
now, and I can't get it to work. Here's a sample of what I've written:

#include "windows.h"

int main()
    {
        MessageBeep(128);
        return 0;
    }

When I compile the program, it runs fine, but all it does is make a
"click" sound, not a beep. What's going on?

Re: [Dev-C++] sizeof returns a wrong value!

[Alfred P. R. <al...@ya...>]

This may not be a problem.  If I'm not mistaken, the compiler will align the the structure so that it's size and address is a multiple of 2.  It could just be that the compiler reports the size that will be allocated in memory, rather than it's declared size.

This is kind of implied in the GCC documentation in -Wabi and -Wcast-align .

If such is the case and you add -Wpadded to your compiler parameters, it should be reported.
The_Eu <th...@ig...> wrote:
FLAVOR00-NONE-0000-0000-000000000000;Hi!  
I have a problem with "sizeof"!  
look in this struct...  
struct Face {  
    char numVert;   ->1 byte  
    short unsigned int v1,v2,v3,v4;   ->4*2 bytes = 8bytes  
    float nx,ny,nz;   ->3*4bytes = 12bytes  
    short unsigned int matIndex; ->2bytes  
};  
The total is 23Bytes, but sizeof(Face) indicate 28bytes!!!  
My declaration "short unsigned int", makes a "int" of 4 bytes, not 2 bytes!  
<snip>



Alfred P. Reaud
 

Re: [Dev-C++] sizeof returns a wrong value!

[Per W. <pw...@ia...>]

Footnote: Try placing numVert last in the struct. Then all items in the
struct will be correctly aligned, and a single pad byte at the end should
suffice to make the struct 24 bytes large.

/Per W

On Sat, 12 Mar 2005, Per Westermark wrote:

> No, sizeof() does not return the wrong value. What you are forgetting is
> that most compilers adds padding when creating structures. Real-life
> processors don't like unaligned data because it might require filling of
> multiple cache-lines to get access to the data.
>
> Most probably, the compiler created:
>
> 0: char numVert;
> 1: char padding1;
> 2: unsigned short v1,v2,v3,v4;
> 10: char padding2[2];
> 12: float nx,ny,nz;
> 24: unsigned short matIndex
> 26: char padding3[2];
>
> The last padding is there to make the complete struct be an even multiples
> of 4 bytes, since the largest elemnt in the struct is float, and
> sizeof(float)=4.
>
> By making the struct size n*4, the declaration:
> struct Face myfaces[10];
> will have all 10 structs properly aligned for the float access.
>
> /Per W
>
> On Sat, 12 Mar 2005, The_Eu wrote:
>
> > Hi!
> > I have a problem with "sizeof"!
> > look in this struct...
> > struct Face {
> >     char numVert;   ->1 byte
> >     short unsigned int v1,v2,v3,v4;   ->4*2 bytes = 8bytes
> >     float nx,ny,nz;   ->3*4bytes = 12bytes
> >     short unsigned int matIndex; ->2bytes
> > };
> > The total is 23Bytes, but sizeof(Face) indicate 28bytes!!!
> > My declaration "short unsigned int", makes a "int" of 4 bytes, not 2 bytes!
> >
> >
> > I'm use Dev C++ 4.9.9.2!
> > Whati is this!
> > Help!!!
>
>
>
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
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Re: [Dev-C++] sizeof returns a wrong value!

[Per W. <pw...@ia...>]

No, sizeof() does not return the wrong value. What you are forgetting is
that most compilers adds padding when creating structures. Real-life
processors don't like unaligned data because it might require filling of
multiple cache-lines to get access to the data.

Most probably, the compiler created:

0: char numVert;
1: char padding1;
2: unsigned short v1,v2,v3,v4;
10: char padding2[2];
12: float nx,ny,nz;
24: unsigned short matIndex
26: char padding3[2];

The last padding is there to make the complete struct be an even multiples
of 4 bytes, since the largest elemnt in the struct is float, and
sizeof(float)=4.

By making the struct size n*4, the declaration:
struct Face myfaces[10];
will have all 10 structs properly aligned for the float access.

/Per W

On Sat, 12 Mar 2005, The_Eu wrote:

> Hi!
> I have a problem with "sizeof"!
> look in this struct...
> struct Face {
>     char numVert;   ->1 byte
>     short unsigned int v1,v2,v3,v4;   ->4*2 bytes = 8bytes
>     float nx,ny,nz;   ->3*4bytes = 12bytes
>     short unsigned int matIndex; ->2bytes
> };
> The total is 23Bytes, but sizeof(Face) indicate 28bytes!!!
> My declaration "short unsigned int", makes a "int" of 4 bytes, not 2 bytes!
>
>
> I'm use Dev C++ 4.9.9.2!
> Whati is this!
> Help!!!

[Dev-C++] sizeof returns a wrong value!

[The_Eu <th...@ig...>]

Hi!  =0D
I have a problem with "sizeof"!  =0D
look in this struct...  =0D
struct Face {  =0D
    char numVert;   ->1 byte  =0D
    short unsigned int v1,v2,v3,v4;   ->4*2 bytes =3D 8bytes  =0D
    float nx,ny,nz;   ->3*4bytes =3D 12bytes  =0D
    short unsigned int matIndex; ->2bytes  =0D
};  =0D
The total is 23Bytes, but sizeof(Face) indicate 28bytes!!!  =0D
My declaration "short unsigned int", makes a "int" of 4 bytes, not 2 byte=
s!=20
=0D
  =0D
I'm use Dev C++ 4.9.9.2!  =0D
Whati is this!  =0D
Help!!!

Re: [Dev-C++] GUI questions

[tichy <ti...@po...>]

Big Playah wrote:
> Hi,
>
> just minor questions, but qould be great help for me to solve:
> 1) I use hungarian keyboard layout
I use Polish  with the same system- without any problems.
Set the right keyboard and key mappings at settongs for languages and text
services

> 2)
try to lower tabulator size

> 3) is there a way to have my #define things in the resource window?
I don't understand what you mean by resource window - this one on tab where
debbuger, compilation log etc. is?
If so, I think it shows only errors at resource files. I had such error msg
when I used styles without including <windows.h>
in resource file.


Andrzej Krynski
http:\\tichy.fm.interia.pl



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

[Alfred P. R. <al...@ya...>]

Try 
typedef struct
{
...
} MyStruct1;
 
That's where the typedef error is coming from.


Farzan Hajian <far...@ho...> wrote:
Hi friends,
I want to declare two structures like this:

struct MyStruct1
{
int i;
MyStruct2 s2;
};
struct MyStruct2
{
float f;
MyStruct1 s1;
};

but there is a compiler error says "'MyStruct2' is used as a type, but is 
not defined as a type."
<snip>



Alfred P. Reaud
 

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

[<in...@vp...>]

Hi.

I hope, that would work following code:
struct MyStruct2; // Declaring MyStruct2
{
      int i;
      MyStruct2* s2;
};
struct MyStruct2
{
      float f;
      MyStruct1* s1;
};

Try to use pointers - they have identical sizes for every type.

--
With best regards, Vladimir 'insider' Prohorov
mailto:in...@vp...
ICQ#:179598229
CommuniGate Pro WebUser Interface v.4.1.8

RE: [Dev-C++] Problem with structs

[<Mat...@Ve...>]

There's a reason this doesn't work, I suspect:
Declaring a MyStruct2 creates a MyStruct1, which creates a MyStruct2, which
creates MyStruct1, which creates a...

How could that ever work? I really do not think it's possible with any given
amount of memory.

Please correct me if I'm wrong, but I can't see this ever being possible.

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...]On Behalf Of Farzan
Hajian
Sent: Friday, March 11, 2005 12:25 PM
To: dev...@li...
Subject: [Dev-C++] Problem with structs


Hi friends,
I want to declare two structures like this:

struct MyStruct1
{
     int i;
     MyStruct2 s2;
};
struct MyStruct2
{
     float f;
     MyStruct1 s1;
};

but there is a compiler error says "'MyStruct2' is used as a type, but is  
not defined as a type."

Then I declare MyStruct2 before MyStruct1 as below:

struct MyStruct2; // Declaring MyStruct2
struct MyStruct1
{
     int i;
     MyStruct2 s2;  // **** Causes error *****
};
struct MyStruct2
{
     float f;
     MyStruct1 s1;
};

but now there is an another error refers to the line  "MyStruct2 s2;" and  
says "`s2' has incomplete type"

Now how can I solve this??

Thanks,


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[Dev-C++] Problem with structs

[Farzan H. <far...@ho...>]

Hi friends,
I want to declare two structures like this:

struct MyStruct1
{
     int i;
     MyStruct2 s2;
};
struct MyStruct2
{
     float f;
     MyStruct1 s1;
};

but there is a compiler error says "'MyStruct2' is used as a type, but is=
 =20
not defined as a type."

Then I declare MyStruct2 before MyStruct1 as below:

struct MyStruct2; // Declaring MyStruct2
struct MyStruct1
{
     int i;
     MyStruct2 s2;  // **** Causes error *****
};
struct MyStruct2
{
     float f;
     MyStruct1 s1;
};

but now there is an another error refers to the line  "MyStruct2 s2;" and=
 =20
says "`s2' has incomplete type"

Now how can I solve this??

Thanks,


--=20
Using Opera's revolutionary e-mail client: http://www.opera.com/m2/

Re: [Dev-C++] Problem for newbie c programmer with Dev c++

[tichy <ti...@po...>]

muz...@ya... wrote:
> notice it can't find cc1plus, but this file is on the system at
> c:\devcpl\Dev-Cpp\libexec\gcc\mingw32\3.4.2
>
simply set path to this folder either in autoexec.bat or dev-cpp options for
binary files path

Andrzej Krynski
http:\\tichy.fm.interia.pl



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