扑抓当前屏幕并保存为图片

自定义截图函数

function TForm1.CaptureForm(HWND: THandle; W, H: Integer): TBitmap;

var

  TmpBitmap: TBitmap;

  TmpCanvas: TCanvas;

  DC: HDC;

begin

  TmpBitmap := TBitmap.Create;

  TmpBitmap.Width := W;

  TmpBitmap.Height := H;

  DC := GetWindowDC(HWND);

  TmpCanvas := TCanvas.Create;

  TmpCanvas.Handle := DC;

  TmpBitmap.Canvas.CopyRect(

    Rect(0, 0, W, H),

    TmpCanvas,

    Rect(0, 0, W, H)); 

  TmpCanvas.Free;

  ReleaseDC(0, DC);

  Result := TmpBitmap;

end;

procedure TForm1.Button1Click(Sender: TObject);
var
  jpg:TJPEGImage;
begin
    jpg:= TJPEGImage.Create;
    jpg.CompressionQuality:=100;
   
    jpg.Assign(CaptureForm(Handle, 500, 500));

    jpg.SaveToFile('D:\1.jpg');
    ShowMessage('扑抓图片成功！');
end;