C / C++ / MFC

class hehheh
{
  HWND somewhere;

  LRESULT CALLBACK WndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
  {
    return DefWindowProc(hWnd, Msg, wParam, lParam);
  }

  // within some function
  void SomeFunction()
  {
    SetWindowLong(this->somewhere, GWL_WNDPROC, (LONG)WndProc); 
  }
}

this

......
        void run();
	void OnStartThread();
	volatile BOOL running;
	static UINT run(LPVOID p);
......

void CMainFrame::OnStartThread()
{
	running = TRUE;
	UpdateData(FALSE);
	AfxBeginThread(run, this);
}

UINT CMainFrame::run(LPVOID p)
{
	CMainFrame * me = (CMainFrame *)p;
	me->run();
	return 0;
}

// This does most of the work
void CMainFrame::run()
{
	// Do some work......
	.....

	// Post a msg to MainFrame to finish the work	
	PostMessage(ID_UPDATE_TIME,0,0);
	
	// Set running to FALSE to kill the thread
	running = FALSE;
}