如何抓取整個windows的畫面

[tim]

以下為抓取 windows 畫面並以 jpg 存檔的方法:

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    var 
      desktophdc: HDC; 
      desktop: HWND; 
      jpegImage: TJPEGImage; 
    begin 
      form2.Height := screen.Height + 15; 
      form2.Width := screen.Width; 
      desktop := GetDesktopWindow(); 
      jpegImage := TJpegImage.Create; 
    try 
      desktophdc:=GetDC(desktop); 
      BitBlt(Image1.Canvas.Handle,0, - 
      15,Screen.Width,Screen.Height, 
      desktophdc,0,0,SRCCOPY); 
      jpegImage.Assign(Image1.Picture.Bitmap); 
      jpegImage.CompressionQuality := 50; // 壓縮比 
      jpegImage.ProgressiveEncoding := False; 
      jpegImage.Compress; 
      JpegImage.SaveToFile('test.jpg'); 
      FreeAndNil(jpegImage); 
    finally 
      ReleaseDC(desktop,desktophdc); 
    end;