你使用错函数了!使用这个就可以了GetDlgItemText() 详情参见 MSDN
CWnd::GetDlgItemText
int GetDlgItemText( int nID, LPTSTR lpStr, int nMaxCount ) const;int GetDlgItemText( int nID, CString& rString ) const;Return ValueSpecifies the actual number of bytes copied to the buffer, not including the terminating null character. The value is 0 if no text is copied.
CWnd::GetDlgItemText
int GetDlgItemText( int nID, LPTSTR lpStr, int nMaxCount ) const;int GetDlgItemText( int nID, CString& rString ) const;Return ValueSpecifies the actual number of bytes copied to the buffer, not including the terminating null character. The value is 0 if no text is copied.
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