如何从另一个函数调用属于类成员的函数？

Question

So I have the following:

INT CMainFrm::load(Cstring path)
{

}

extern "C"
{
   EXPORT void fileLoad(CString filePath)
   {
      CMainFrm *cmf = new CMainFrm();
      cmf->load(filePath);
   }
}

Both are located in mainfrm.cpp.

fileLoad() is called from a dll and that works fine. When I try to call load() from inside fileload() it gives me unhandled exception...I also tried calling it using an instance of CMainFrm but the result is the same. Any suggestion on how to do this properly?

Answer 1

You need to call the CMainFrm object that already exists. (It is created at program startup.) MFC provides a global function that you can call to get a pointer to this main window: AfxGetMainWnd(). You may cast the returned value to CMainFrm* and use it to call load.

Answer 2

You must call Create for dynamically allocated/created MFC classes ( CWnd ), otherwise your m_hWnd will not be valid and your window not created.
Most likely you will get a exception.