［聲明］Declare Function PaintRgn Lib "gdi32" (ByVal hdc As Long, ByVal hRgn As Long) As Long［說明］用當前刷子背景色填充指定區域［參數表］hdc ------------ Long，設備場景句柄hRgn ----------- Long，將填充的區域句柄［返回值］Long，執行成功為非零值，失敗為0
