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void CWinApp::EnableModeless(BOOL bEnable)
{
#ifdef _AFX_NO_OLE_SUPPORT
UNUSED(bEnable);
#endif
// no-op if main window is NULL or not a CFrameWnd
CWnd* pMainWnd = AfxGetMainWnd();
if (pMainWnd == NULL || !pMainWnd-> IsFrameWnd())//异常发生在这 .....................
return;
#ifndef _AFX_NO_OLE_SUPPORT
// check if notify hook installed
ASSERT_KINDOF(CFrameWnd, pMainWnd);
CFrameWnd* pFrameWnd = (CFrameWnd*)pMainWnd;
if (pFrameWnd-> m_pNotifyHook != NULL)
pFrameWnd-> m_pNotifyHook-> OnEnableModeless(bEnable);
#endif
}