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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Image1: TImage;
    procedure Button1Click(Sender: TObject);

  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
   B : TBitmap;
implementation

{$R *.dfm}
procedure GetScreenShot (var ABitmap : TBitmap);  
var
  DC : THandle;
begin  
  if Assigned(ABitmap) then                  // Prüfen ob gültiges Bitmap übergeben wurde 
  begin  
    DC := GetDC(0);                          // Desktop DC holen 
    try  
      ABitmap.Width := Screen.Width;           // Bitmapgrösse den... 
      ABitmap.Height := Screen.Height;         // Bildschirm anpassen
      BitBlt(ABitmap.Canvas.Handle,            // Dekstop 
             0,0,Screen.Width,Screen.Height,   // in 
             DC,                               // das 
             0,0,                              // Bitmap 
             SrcCopy                           // kopieren 
        );  
    finally  
      ReleaseDC(0, DC);                        // DC wieder freigeben 
    end;  
  end;
end;
procedure TForm1.Button1Click(Sender: TObject);


begin
  B := TBitmap.Create;  
  try  
    GetScreenShot(B);  
    Image1.Picture.Assign(B);  
  finally
    B.Free;
  end;  
end; 





end.                    

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procedure ScreenShotActiveWindow(Bild: TBitMap); 
var 
  c : TCanvas; 
  r, t : TRect; 
  h : THandle; 
begin 
  c := TCanvas.Create; 
  c.Handle := GetWindowDC(GetDesktopWindow); 
  h := GetForeGroundWindow; 
  if h<>0 then 
    GetWindowRect(h, t); 
  try 
    r := Rect(0,0,t.Right-t.left, t.Bottom-t.Top); 
    Bild.Width := t.Right-t.left; 
    Bild.Height := t.Bottom-t.Top; 
    Bild.Canvas.CopyRect(r, c, t); 
  finally 
    ReleaseDC(0, c.handle); 
    c.Free; 
  end; 
end;