Programming Tips - Why do I get "_dllmain@12 already defined" when I try to link my program?
Q. Why do I get "_dllmain@12 already defined" when I try to link my program?
A. This happens when your program has a DllMain() function
and you are trying to link with MFC (in Visual C++).
If your program is non-MFC you have accidentally included MFC.
Remove (or comment out) all MFC related includes in stdafx.h.
Remove any thing like: AFX_MANAGE_STATE(AfxGetStaticModuleState());
If your program is MFC you need to remove your DllMain()
Initialize in CMyApp::InitInstance()