vc6，建立MFC對話框程序，主窗口的InitInstance()里面，運行SDK的API函數MessageBox()，都無法看見彈出的窗口。如：
BOOL CMyText::InitInstance()
{
#ifdef _AFXDLL
          Enable3dControls();   // Call this when using MFC in a shared DLL
#else
          Enable3dControlsStatic(); // Call this when linking to MFC statically
#endif

          CMyTextDlg dlg;
          m_pMainWnd = &dlg;
          int nResponse = dlg.DoModal();
          if (nResponse == IDOK)
          {
                    // TODO: Place code here to handle when the dialog is
                    //  dismissed with OK
            }
          else if (nResponse == IDCANCEL)
          {
           // TODO: Place code here to handle when the dialog is
           //  dismissed with Cancel
           MessageBox(NULL,"haha","aa",MB_OK);   //不會出現
          }

          // Since the dialog has been closed, return FALSE so that we exit the
          //  application, rather than start the application's message pump.
          return FALSE;
         }

上例中的MessageBox(),運行時一跳而過，看不見窗口。聽的減彈出窗口的聲音。不知道為什么，網上有人提出分析這樣的問題。其他窗口也無法生成。但是不知為何。一種解決方法是注釋掉m_pMainWnd = &dlg;這句即可正常。我試了，的確如此！

那位高手或知之者路過請解答！謝謝!

                                                                                                           ---------------------saga.constantine