1   
2   unit Unit1;
3   
4   interface
5   
6   uses
7     Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
8     Dialogs, StdCtrls;
9   
10  type
11    TForm1 = class(TForm)
12      Button2: TButton;
13      procedure Button1Click(Sender: TObject);
14      procedure Button2Click(Sender: TObject);
15    private
16      { Private declarations }
17    public
18      { Public declarations }
19    end;
20  
21  var
22    Form1: TForm1;
23  
24  implementation
25  
26  {$R *.dfm}
27  
28  
29  
30  procedure TForm1.Button2Click(Sender: TObject);
31  var
32    DeskTopDC: HDc;
33    DeskTopCanvas: TCanvas;
34    DeskTopRect: TRect;
35  begin
36    DeskTopDC := GetWindowDC(GetDeskTopWindow);
37    DeskTopCanvas := TCanvas.Create;
38    DeskTopCanvas.Handle := DeskTopDC;
39    DeskTopRect := Rect(0, 0, Screen.Width, Screen.Height);
40    Form1.Canvas.CopyRect(DeskTopRect, DeskTopCanvas, DeskTopRect);
41    ReleaseDC(GetDeskTopWindow, DeskTopDC);
42  end;
43  
44  end.
45