Question

I want to do something like this:

library.h

#define main ClientMain

libary.cpp

#define main ClientMain
extern "C" int main (int argc, char *argv[], char *envp[]);

#ifdef WINDOWS
int WINAPI WinMain()
{
  // other code here
  ClientMain(0, 0, 0);
}
#endif

client.cpp // platform independent code

#include library.h
int main(int argc, char* argv[]){ // stuff}

However, I keep getting the error:
MSVCRTD.lib(crtexe.obj) : error LNK2019: unresolved external symbol main referenced in function __tmainCRTStartup

Any idea what I am doing wrong?

Answer 1

You’re compiling your Windows program as a console program. In that case, the expected entry point really is main, not WinMain. The latter is for GUI programs. Your program has a function named WinMain and a function named ClientMain, but no main.

It’s fine if you want your library to provide the main function, but you have to make sure it’s really named main, because that’s what the linker will be looking for.