Creating ANSI and UNICODE versions of Windows programs in c

prog.c

We include tchar.h because it defines _tWinMain depending on UNICODE to either WinMain or wWinMain. Thus, by declaring «our» WinMain as _tWinMain, depending on _UNICODE, either WinMain or wWinMain is called.

The program itself is rather simple: it shows a message box that reveals which entry point was used and what the size of a TCHAR is and how MessageBox is expanded.

#include <windows.h>
#include <tchar.h>
#include <strsafe.h>


#define macroToString(macro) expandMacro(macro)
#define expandMacro(macro) TEXT(#macro)

void msg(LPCTSTR calledFunction) {

   TCHAR buf[500];

   StringCbPrintf(buf, 500,
       TEXT("Called function: %s\nSize of TCHAR = %d\nMessageBox = %s"), 
       calledFunction,
       sizeof(TCHAR),
       macroToString(MessageBox));

   MessageBox(NULL,
       buf, 
       GetCommandLine(),
       0
   );

}


WINAPI _tWinMain (
     HINSTANCE hInstance    ,
     HINSTANCE hPrevInstance,
     LPTSTR    lpCmdLine    ,
     int       nShowCmd
) {

  msg(macroToString(_tWinMain));

  return 0;

}

Github repository Windows-development, path: /UNICODE/WinMain/prog.c

Makefile

This Makefile creates two versions of the program: ansi.exe and unicode.exe. unicode.exe is produced with _UNICODE and UNICODE defined.

all: unicode.exe ansi.exe

unicode.exe: unicode.obj
	@link /nologo unicode.obj user32.lib /OUT:unicode.exe

ansi.exe: ansi.obj
	@link /nologo ansi.obj    user32.lib /OUT:ansi.exe 

unicode.obj: prog.c Makefile
	@cl /nologo /W3 /DUNICODE /D_UNICODE /c prog.c /Founicode.obj

ansi.obj: prog.c Makefile
	@cl /nologo /W3                      /c prog.c /Foansi.obj

clean:
	@del *exe *.obj

Github repository Windows-development, path: /UNICODE/WinMain/Makefile

Creating ANSI and UNICODE versions of Windows programs in c

prog.c

Makefile

Running

See also