mfc中全局变量的使用，：：m_pMainWnd使用的时候，是不是要包含什么头文件

：：m_pMainWnd=new CancasForm;
：：m_pMainWnd->ShowWindow(：：m_nCmdShow);
：：m_pMainWnd->UpdateWindow();
return TRUE;

为什么我添加：：运行就会出错
'm_pMainWnd' : is not a member of '`global namespace''

去掉就对了

CWinThread::m_pMainWnd
This data member contains a pointer to a CWnd object. Use this data member to store a pointer to the main window object of your thread.

The MFC for Windows CE automatically terminates your thread when the window referred to by m_pMainWnd is closed. If this thread is the primary thread for an application, the application will also be terminated. If this data member is NULL, the main window for the CWinApp object of the application will be used to determine when to terminate the thread. m_pMainWnd is a public variable of type CWnd*.

Typically, you set this member variable when you override InitInstance. In a worker thread, the value of this data member is inherited from its parent thread.

CWnd* m_pMainWnd;
Requirements
  Windows CE versions: 1.0 and later
  Header file: Declared in Afxwin.h
  Platform: H/PC Pro, Palm-size PC, Pocket PC

See Also
CWinThread::InitInstance, CWnd
多查查MSDN不就知道这些了呢

我添加了头文件了，还是不行？

m_pMainWnd是global类型吗.为什么你加上::呢.你再试试

可能是书有问题吧，我把：：去掉就行了