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伸縮窗口的代碼：

void CVbvbDlg::OnButton1() //伸縮窗口
{
    
    CString str;
    if(GetDlgItemText(IDC_BUTTON1,str),str=="收縮<<")
    {

        SetDlgItemText(IDC_BUTTON1,"擴展>>");
        SetWindowPos(NULL,0,0,rectSmall.Width(),rectSmall.Height(),SWP_NOMOVE | SWP_NOZORDER);
        //SetWindowPos()函數用於改變窗口的配置;
 

    }
    else
    {
        SetDlgItemText(IDC_BUTTON1,"收縮<<");
        SetWindowPos(NULL,0,0,rectLarge.Width(),rectLarge.Height(),SWP_NOMOVE | SWP_NOZORDER);
    }
}

初始化時獲取伸縮窗口的尺寸：

    CRect rectSeparator;
    GetWindowRect((&rectLarge));

    GetDlgItem(IDC_RIGHT)->GetWindowRect((&rectSeparator));
    
    rectSmall.left
 
=rectLarge.left;
    rectSmall.top=rectLarge.top;
    rectSmall.bottom=rectLarge.bottom;
    rectSmall.right=rectSeparator.left;

    SetWindowPos(NULL,0,0,rectSmall.Width(),rectSmall.Height(),SWP_NOMOVE | SWP_NOZORDER);

可伸縮的窗口