C++语言 遍历对话框中的控件

    CWnd* pWnd = GetTopWindow();
    while(pWnd!=NULL)
    {
        int i = pWnd->GetDlgCtrlID();
        CString str;
        str.Format("ID是:%d", i);
        //pWnd->SetWindowText(str);
        if(i!=-1)
            MessageBox(str);
        pWnd = pWnd->GetNextWindow();
        
    }