Windows GUI with Consol...

[Nobody/Anonymous]

Background, i'm developing a new app...windows gui, and well I want and would like to use a console for things like printf, cout etc. So after some searching I found the following code, originally released from microsoft in 97 or something. I changed it so it would compile with Dev-C++...no hard...just header file problems.

**************************************
CODE FOLLOWS

#include <windows.h>

#include <process.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>

#include <iostream>
#include <stdlib.h>
//#include <fstream.h>

#define MAX_CONSOLE_LINES 255;
HANDLE  g_hConsoleOut; // Handle to debug console
extern void RedirectIOToConsole();

// This function dynamically creates a "Console" window and points stdout and stderr to it.
// It also hooks stdin to the window
// You must free it later with FreeConsole

void RedirectIOToConsole()
{   
   int   hConHandle;   
   long  lStdHandle;   
   CONSOLE_SCREEN_BUFFER_INFO coninfo;
   FILE  *fp;   
  
   // allocate a console for this app   
   AllocConsole();   
  
   // set the screen buffer to be big enough to let us scroll text
   GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE),&coninfo);   
   coninfo.dwSize.Y = MAX_CONSOLE_LINES; 
  
   // How many lines do you want to have in the console buffer   
   SetConsoleScreenBufferSize(GetStdHandle(STD_OUTPUT_HANDLE),coninfo.dwSize);   
  
   // redirect unbuffered STDOUT to the console   
   g_hConsoleOut = GetStdHandle(STD_OUTPUT_HANDLE);   
   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 );       
  
   SetConsoleTitle("The Console Titlebar Text");          
  
   // make cout, wcout, cin, wcin, wcerr, cerr, wclog and clog    
   // point to console as well  Uncomment the next line if you are using c++ cio or comment if you don't   
  
   std::ios::sync_with_stdio();
}

[aditsu]

...what problems?

here's my compile log for your code:

Compiler: Default compiler
Building Makefile: "F:\work\cpp\tests\12\Makefile.win"
Finding dependencies for file: F:\work\cpp\tests\12\test.cpp
Executing  make...
make.exe -f "F:\work\cpp\tests\12\Makefile.win" all
g++.exe -c test.cpp -o test.o -I"C:/progs/Dev-Cpp/include/c++"  -I"C:/progs/Dev-Cpp/include/c++/mingw32"    -pedantic -Wall -W -Wno-long-long -fmessage-length=0
g++.exe test.o  -o "Project1.exe" -L"C:/progs/Dev-Cpp/lib"
C:/progs/Dev-Cpp/lib/libmingw32.a(main.o)(.text+0x7f):main.c: undefined reference to `WinMain@16'
make.exe: *** [Project1.exe] Error 1
Execution terminated

Adrian

[Nobody/Anonymous]

You app is trying to link and can not find main()
Use Dev-C++ to create a windows app. Create another file and drop this code in. Create a header file if you want or declare "extern void RedirectIOToConsole();" in main.

Insert "RedirectIOToConsole();" function call in main after variable declaration. Do windows stuff...You should see a console window if you run, with all cout going there.
When finished call "FreeConsole()"
return from main...finished over and out.