left of '->GetStatus' must point to class/struct/union/generic type

LRESULT CALLBACK PlayWindow::PlayWindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)//这是一个static成员函数
{
 switch (uMsg)
 {
 case WM_LBUTTONDOWN:
       if(m_pIPlayCtrl->GetStatus() == 3)
      {
           m_pIPlayCtrl->Pause();
      }
     break;
 default:
  return DefWindowProc(hWnd, uMsg, wParam, lParam);
 }
 return DefWindowProc(hWnd, uMsg, wParam, lParam);
}

由于PlayWindowProc是窗口过程，在类中定义成static成员函数，m_pIPlayCtrl是非static变量，访问出现问题。

解决该问题：可以在static成员函数PlayWindowProc变为非static成员函数，另外添加一个static成员函数__PlayWindowProc，调用PlayWindowProc，这样PlayWindowProc就可以访问非static成员了。如下所示：

LRESULT CALLBACK PlayWindow::__PlayWindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
 PlayWindow* pThis = reinterpret_cast<PlayWindow*>(GetWindowLong(hWnd, GWL_USERDATA));
 if(pThis)
 {
  return pThis->PlayWindowProc(hWnd, uMsg, wParam, lParam);
 }
 return DefWindowProc(hWnd, uMsg, wParam, lParam);
}

//视频播放窗口的过程函数////////////////////////////////////////////////////////////////////////
LRESULT CALLBACK PlayWindow::PlayWindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{

 switch (uMsg)
 {
 case WM_LBUTTONDOWN:
      if(m_pIPlayCtrl->GetStatus() == 3)
     {
         m_pIPlayCtrl->Pause();
     }
      break;
 default:
  return DefWindowProc(hWnd, uMsg, wParam, lParam);
 }
 return DefWindowProc(hWnd, uMsg, wParam, lParam);
}