DLL 프로젝트를 수행할 때 error LNK2005: _DllMain@12 already defined in xxxLib.obj 와 같이 에러가 발생하면

DLLMIAN앞에다  extern “C” { int _afxForceUSRDLL; } 와 같이 기록해주면 된다.

extern "C" { int _afxForceUSRDLL; }
BOOL APIENTRY DllMain( HANDLE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
    switch (ul_reason_for_call)
	{
		case DLL_PROCESS_ATTACH:
		case DLL_THREAD_ATTACH:
		case DLL_THREAD_DETACH:
		case DLL_PROCESS_DETACH:
			break;
    }
    return TRUE;
}