What is the correct way to define a UNICODE independent WinMain function?

Question

What is the correct way to define a UNICODE independent WinMain function for a Windows program that uses the CRT?

I am inclined to think that it should be something like

WINAPI
#ifdef UNICODE
  wWinMain
#else
  WinMain
#endif
 ( ... ) {
  ...
}

However, I am wondering if there is not already a predefined macro that expands to the correct symbol when compiling the source units (like those that are offered in the windows header files that expand to either WinApiFuncA or WinApiFuncW .

Answer 1

In <tchar.h> , the macro _tWinMain expands to WinMain or wWinMain depending on project settings. This isn't enough, though; you need to declare the third argument ( lpCmdLine ) with the charset-agnostic LPTSTR too:

int APIENTRY _tWinMain(
    HINSTANCE hInstance, 
    HINSTANCE hPrevInstance, 
    LPTSTR lpCmdLine, 
    int nShowCmd
)

If Unicode is enabled on the project, this becomes LPWSTR , giving the signature:

int APIENTRY wWinMain(
    HINSTANCE hInstance, 
    HINSTANCE hPrevInstance, 
    LPWSTR lpCmdLine, 
    int nShowCmd
)

If Unicode is not enabled, you get the signature:

int APIENTRY WinMain(
    HINSTANCE hInstance, 
    HINSTANCE hPrevInstance, 
    LPSTR lpCmdLine, 
    int nShowCmd
)