Problem with win32 GUI application using console

Problem with win32 GUI application using console

[Slava Pestov]

Hi everybody,

I'm building a native Win32 GUI application which should be able to 
display a console on demand for debugging purposes. I found that my 
program was crashing when compiled with Cygwin, however it worked fine 
with Visual Studio.

Here is the output of gcc --version:

gcc (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

I narrowed the problem down to a short test case. Here goes:

-------------------------

/* Compile with -mno-cygwin -mwindows */

#include <windows.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>

int APIENTRY WinMain(HINSTANCE hInstance,
	HINSTANCE hPrevInstance,
	LPTSTR lpCmdLine,
	int nCmdShow)
{
	if(!AllocConsole())
		exit(1);
	HANDLE h = GetStdHandle((intptr_t)STD_OUTPUT_HANDLE);
	if(h == INVALID_HANDLE_VALUE)
		exit(2);
	int fd = _open_osfhandle(h,_O_TEXT);
	if(fd == -1)
		exit(3);
	FILE *fp = _fdopen(fd,"w");
	if(!fp)
		exit(4);
	fprintf(fp,"Hello world\n");
	fflush(fp);
	exit(0);
}

-------------------------

Let me know if you need any additional information.

Cheers

Slava

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Re: Problem with win32 GUI application using console

[Lewis Hyatt]

Slava Pestov wrote:

> I narrowed the problem down to a short test case. Here goes:
> 


It works fine for me.

-Lewis


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Re: Problem with win32 GUI application using console

[Slava Pestov]

What cygwin version and what gcc version are you using? Also can you  
send me the compiled a.exe?

Slava

On 23-Nov-07, at 8:52 PM, Lewis Hyatt wrote:

> Slava Pestov wrote:
>
>> I narrowed the problem down to a short test case. Here goes:
>
>
> It works fine for me.
>
> -Lewis
>
>
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Re: Problem with win32 GUI application using console

[Lewis Hyatt]

>> It works fine for me.

Slava Pestov wrote:
 > What cygwin version and what gcc version are you using? Also can you
 > send me the compiled a.exe?

I am using cygwin 1.5.24-2, and the most up-to-date gcc, which is 
3.4.4-3 for the cygwin version, 20040810-1 for the MinGW version, which 
is what is actually called.

I emailed you a gzipped tar with the source, executable, and the output 
log. If you don't get it, it might have been blocked by a spam firewall 
or whatever, let me know.

It might help if you can specify in what way it is failing for you. Does 
it return an exit code? Or segfault? Or what?

-Lewis



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