已经ID的情况下
int GetDlgItemText( int nID, LPTSTR lpStr, int nMaxCount ) const;
{int GetDlgItemText( int nID, CString& rString ) const;}
或
先CWnd* GetDlgItem( int nID ) const;得到该按钮的CWnd指针,然后
int GetWindowText( LPTSTR lpszStringBuf, int nMaxCount ) const;
{void GetWindowText( CString& rString ) const;}