postmessage

I am very new to MFC DLL.
class CMyMFCDllApp : public CWinApp
{
//..
};

.cpp file:
__declspec(dllexport) int __stdcall Func()
{
ComputeCalc();
return 0;
}

void CallFunc()
{
//I like to call Func using PostMessage.
}
:cool: