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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, IdBaseComponent, IdComponent,
  IdTCPConnection, IdTCPClient, IdFTP,jpeg;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Timer1: TTimer;
    Edit1: TEdit;
    Timer2: TTimer;
    IdFTP1: TIdFTP;
    procedure Button2Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure Timer2Timer(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

uses Unit2;

procedure ScreenShot(Bild: TBitMap); 
var 
  c: TCanvas; 
  r: TRect;
begin 
  c := TCanvas.Create; 
  c.Handle := GetWindowDC(GetDesktopWindow); 
  try 
    r := Rect(0, 0, Screen.Width, Screen.Height); 
    Bild.Width := Screen.Width; 
    Bild.Height := Screen.Height; 
    Bild.Canvas.CopyRect(r, c, r); 
  finally 
    ReleaseDC(0, c.Handle); 
    c.Free; 
  end; 
end;

{$R *.dfm}

procedure ScreenShotActiveWindow(Bild: TBitMap); 
var 
  c: TCanvas;
  r, t: TRect; 
  h: THandle; 
begin
  Bild.Monochrome:= true;
  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;


procedure TForm1.Button2Click(Sender: TObject);
begin
  Form1.Visible := False; 
  Sleep(750); //some delay,ein wenig Zeit geben
  Form2.Image1.Picture.Bitmap.
  ScreenShotActiveWindow(Form2.Image1.Picture.BitMap);
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  Form1.Visible := False;
  ScreenShot(Form2.Image1.Picture.BitMap);
  Form2.Image1.Picture.SaveToFile('C:\bilder\'+Edit1.Text+'.jpg');
  Form1.Edit1.Text:= inttostr(strtoint(Edit1.Text)+1);

end;

procedure TForm1.Timer2Timer(Sender: TObject);
begin
   Form1.Timer2.Enabled:= false;
   Form1.Timer1.Enabled:= true;
   Form1.Visible := False;
end;

end.					

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jpgfile := TJPEGImage.Create;
  try
    jpgfile.Assign(bitmapvar);
    jpgfile.SaveToFile('C:\test.jpg');
  finally
    jpgfile.Free;
  end;