本文整理自网络，侵删。
procedure TForm1.Button1Click(Sender: TObject);
var
Fullscreen:Tbitmap;
FullscreenCanvas:TCanvas;
dc:HDC;
myJpeg:TJpegImage;
begin
Fullscreen := TBitmap.Create; // create a bimap to save picture
myJpeg := TJpegImage.Create;
Fullscreen.Width := screen.width;
Fullscreen.Height := screen.Height;
DC := GetDC (0); // get screen dc
FullscreenCanvas := TCanvas.Create; //create screen canvas
FullscreenCanvas.Handle := DC;
Fullscreen.Canvas.CopyRect (Rect (0, 0, screen.Width, screen.Height), fullscreenCanvas,Rect (0, 0, Screen.Width, Screen.Height));
FullscreenCanvas.Free; //free screencanvas
ReleaseDC (0, DC);
//*******************************image1.picture.Bitmap:=fullscreen;//哈哈，拿到屏幕了！
image1.Width:=fullscreen.Width;
image1.Height:=fullscreen.Height;
image1.Picture.bitmap:=fullscreen;
myJpeg.Assign(Image1.Picture.Bitmap);
myJpeg.CompressionQuality := 50;
myJpeg.Compress;
myJpeg.SaveToFile('1.jpg');
myJpeg.Free;
end;
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