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Subject:	Redirect IO in win32 GUI application to console
MIME-Version:	1.0
Date:	Thu, 6 May 2004 10:25:02 +0200
Message-ID:	<A921AF47F198CF4DB871FBFB094495944F37@DC1.panoratio.local>
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X-MS-TNEF-Correlator:
From:	"Arek Baranowski" <praktikant01 AT panoratio DOT de>
To:	<cygwin AT cygwin DOT com>
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id i468TOTA011621

Hi folks,
I need a win32 GUI application with standard IO access to a console.
I found at the web a solution (see source at end of this mail) which works fine with windows console (winXP) but crashes when used with the cygwin console. In detail it's the line

  . . .

  *stdout = *fp;

  . . .

which doesn't work.

For some helpful ideas I would appreciate.


___________________________________________

   Dipl.-Informatiker
   Arkadiusz Baranowski

   Panoratio Database Images GmbH
   Ismaninger Str. 17-19
   81675 München

   Tel: +49 89 413 006-82
   Mobil: +49 179 479 451 0
   E-Mail: arek DOT baranowski AT panoratio DOT de

            www.panoratio.de
___________________________________________






// Beginning of file

// This is required for using win console functions
#define _WIN32_WINNT 0x0501

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


int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR lpCmdLine,
                     int nCmdShow)
{


  int hConHandle;
  long lStdHandle;
  FILE *fp;
  int iVar;

  // Try to attach to a console
  if (!AttachConsole (ATTACH_PARENT_PROCESS)) {
    MessageBox (NULL,"Could not attach to a console.\n"
                "Start program from a console.",
                "Message Box",MB_OK);
    ExitProcess (1);
  }

  // redirect unbuffered STDOUT to the console
  lStdHandle = (long)GetStdHandle(STD_OUTPUT_HANDLE);
  hConHandle = _open_osfhandle(lStdHandle, _O_TEXT);
  fp = _fdopen( hConHandle, "w" );
  *stdout = *fp;
  setvbuf( stdout, NULL, _IONBF, 0 );

  // redirect unbuffered STDIN to the console
  lStdHandle = (long)GetStdHandle(STD_INPUT_HANDLE);
  hConHandle = _open_osfhandle(lStdHandle, _O_TEXT);
  fp = _fdopen( hConHandle, "r" );
  *stdin = *fp;
  setvbuf( stdin, NULL, _IONBF, 0 );

  // redirect unbuffered STDERR to the console
  lStdHandle = (long)GetStdHandle(STD_ERROR_HANDLE);
  hConHandle = _open_osfhandle(lStdHandle, _O_TEXT);
  fp = _fdopen( hConHandle, "w" );
  *stderr = *fp;
  setvbuf( stderr, NULL, _IONBF, 0 );

  // test stdio
  fprintf(stdout, "Test output to stdout\n");
  fprintf(stderr, "Test output to stderr\n");
  fprintf(stdout, "Enter an integer to test stdin: ");
  fscanf(stdin,"%d", &iVar);
  printf("You entered %d\n", iVar);
  getch();


  return 0;

}

//End of File


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