为什么？

Question

为什么我new 一个new Dialog类为一个无模式对话框，在这台电脑上hwnd不是0x000000，而到另一台电脑上却是0x0000000？

Answer 1

哦，都装有vc6，都是win2000pro+sp4

Answer 2

if (m_pWndDlg==NULL) {
                                    m_pWndDlg= new CInputDlg;
} ((CInputDlg *)m_pWndDlg)->Create(CInputDlg::IDD);
((CInputDlg *)m_pWndDlg)->m_pCurrObj = m_pCurrObj;
((CInputDlg *)m_pWndDlg)->m_strTrain = ((CDrawSash*)m_pCurrObj)->m_csTrain;
((CInputDlg *)m_pWndDlg)->m_strTrack = ((CDrawSash*)m_pCurrObj)->m_csTrack;
((CInputDlg *)m_pWndDlg)->m_strGoTime = ((CDrawSash*)m_pCurrObj)->m_csGoTime;
((CInputDlg *)m_pWndDlg)->m_strComeTime = ((CDrawSash*)m_pCurrObj)->m_csComeTime;
((CInputDlg *)m_pWndDlg)->m_cbSign.SetCurSel(0);///到这行就会终止程序，如果m_pWndDlg的hwnd不是0x00000000，就不会终止
((CInputDlg *)m_pWndDlg)->UpdateData(FALSE);
((CInputDlg *)m_pWndDlg)->m_cbTrain.EnableWindow(FALSE);
谢谢指教

Answer 3

if (m_pWndDlg==NULL) {
   m_pWndDlg= new CInputDlg;
   ((CInputDlg *)m_pWndDlg)->Create(CInputDlg::IDD);
}
((CInputDlg *)m_pWndDlg)->m_pCurrObj = m_pCurrObj;
((CInputDlg *)m_pWndDlg)->m_strTrain = ((CDrawSash*)m_pCurrObj)->m_csTrain;
((CInputDlg *)m_pWndDlg)->m_strTrack = ((CDrawSash*)m_pCurrObj)->m_csTrack;
((CInputDlg *)m_pWndDlg)->m_strGoTime = ((CDrawSash*)m_pCurrObj)->m_csGoTime;
((CInputDlg *)m_pWndDlg)->m_strComeTime = ((CDrawSash*)m_pCurrObj)->m_csComeTime;
((CInputDlg *)m_pWndDlg)->m_cbSign.SetCurSel(0);///到这行就会终止程序，如果m_pWndDlg的hwnd不是0x00000000，就不会终止
((CInputDlg *)m_pWndDlg)->UpdateData(FALSE);
((CInputDlg *)m_pWndDlg)->m_cbTrain.EnableWindow(FALSE);