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procedure TForm1.Button2Click(Sender: TObject);
var
  zahl : integer;
  p : TFileName;

begin
zahl:= 1;
P:='C:\Screenie.bmp';

RenameFile('C:\Screenie.bmp', 'C:\Screenie2.bmp')  ;                    

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, JPEG, ShellApi, Menus, ComCtrls;

type
  TForm1 = class(TForm)
    Button2: TButton;
    Button1: TButton;
    Button3: TButton;
    Button4: TButton;
    CheckBox1: TCheckBox;
    Button5: TButton;



    procedure Button5Click(Sender: TObject);
    procedure FormShow(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;



implementation

{$R *.dfm}

Procedure BmpToJpg(const Filename: String; Quality: TJPEGQualityRange=100);
var
 Bmp: TBitmap;
 Jpg: TJpegImage;
begin
Bmp:=TBitmap.Create;
Jpg:=TJpegImage.Create;
try
  Bmp.LoadFromFile(Filename);
  Jpg.CompressionQuality:=Quality;
  Jpg.Assign(Bmp);
  Jpg.SaveToFile(ChangeFileExt(Filename, '.jpg' ));
finally
  Jpg.Free;
  Bmp.Free;
end;
end;

procedure SaveAppScreen(const SaveBmpFileName: string);
var
  Bitmap: TBitmap;
  Canvas: TCanvas;
begin
  Canvas := TCanvas.Create;
  try
    Canvas.Handle := GetWindowDC(0);
    try
      Bitmap := TBitmap.Create;
      try
        Bitmap.Width := Application.MainForm.Width;
        Bitmap.Height:= Application.MainForm.Height; 
        Bitmap.PixelFormat := pfDevice;
        BitBlt(Bitmap.Canvas.Handle, 0, 0, Pred(Application.MainForm.Width), Pred(
               Application.MainForm.Height), Canvas.Handle,
               Application.MainForm.Left, Application.MainForm.Top,
               Bitmap.Canvas.CopyMode);
        Bitmap.SaveToFile(SaveBmpFileName);
      finally 
        FreeAndNil(Bitmap);
      end;
    finally 
      ReleaseDC(0, Canvas.Handle);
    end;
  finally
    FreeAndNil(Canvas);
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  zahl : integer;
  p : TFileName;

begin
zahl:= 1;
P:='C:\Screenie.bmp';

RenameFile('C:\Screenie.bmp', 'C:\Screenie2.bmp')  ;
SaveAppScreen(p);
if CheckBox1.Checked then
begin
  BmpToJpg(p);
  deletefile(p);
end;


end;

procedure TForm1.Button4Click(Sender: TObject);
begin
Form1.Width := 800;
Form1.Height := 600

end;

procedure TForm1.Button3Click(Sender: TObject);
begin
Form1.Width := 1024;
Form1.Height := 768
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
Form1.Width := 1280;
Form1.Height := 1024;
end;



procedure TForm1.FormShow(Sender: TObject);
begin
Form1.ScreenSnap := true;
Form1.SnapBuffer := 30;
end;

procedure TForm1.Button5Click(Sender: TObject);
var
  p : TFileName;
  j : TFileName;

begin
 P:='C:\Screenie.bmp';
 j:='C:\Screenie.jpg';

  if ShellExecute(Application.Handle,
                 'open',
                 PChar(p),
                 Nil, Nil, SW_NORMAL) <= 32 then
    ShellExecute(Application.Handle,
                 'open',
                 PChar(j),
                 Nil, Nil, SW_NORMAL)


end;

end.                    

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procedure TForm1.Button2Click(Sender: TObject);
var
  zahl : integer;
  p : TFileName;

begin
Button2.Tag := Button2.Tag +1;

ShowMessage(IntToStr(Button2.Tag)+' mal geklickt!');

P:='C:\Screenie.bmp';

RenameFile('C:\Screenie.bmp', 'C:\Screenie2.bmp')  ;
SaveAppScreen(p);
if CheckBox1.Checked then
begin
  BmpToJpg(p);
  deletefile(p);                    

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procedure TForm1.FormCreate(Sender: TObject);
begin
Button2.Tag := 0;
end;

end.                    

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ShowMessage(IntToStr(Button2.Tag)+' mal geklickt!');

RenameFile('C:\Screenie.bmp', 'C:\Screenie2.bmp');                    

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RenameFile('C:\Screenie.bmp', 'C:\Screenie(IntToStr(Button2.Tag)+'.bmp')');                    

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RenameFile('C:\Screenie.bmp', PCHAR('C:\Screenie'+IntToStr(Button2.Tag)+'.bmp'));