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> Subject: Self-deleting executable



The following code works.



**************************************************************************



unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,

  StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    Label1: TLabel;

    procedure Button1Click(Sender: TObject);

  private

    { Private declarations }

    procedure DeleteSelf;

  public

    { Public declarations }

  end;



var

  Form1: TForm1;



implementation



{$R *.DFM}



//*********************************************************

procedure TForm1.DeleteSelf;

//*********************************************************

var

    F: TextFile;

    batName: string;

    pi: TProcessInformation;

    si: TStartupInfo;

begin

    batName := ExtractFilePath(ParamStr(0)) + '$$$$$$$$.bat';

    AssignFile(F,batName);

    Rewrite(F);

    Writeln(F,':try');

    Writeln(F,'del "'+ParamStr(0)+'"');

    Writeln(F,'if exist "'+ ParamStr(0)+'"'+' goto try');

    Writeln(F,'del "' + batName + '"' );

    CloseFile(F);

    FillChar(si, SizeOf(si), $00);

    si.dwFlags := STARTF_USESHOWWINDOW;

    si.wShowWindow := SW_HIDE;

    if CreateProcess( nil, PChar(batName), nil, nil, False,

IDLE_PRIORITY_CLASS, nil, nil, si, pi ) then

       begin

            CloseHandle(pi.hThread);

            CloseHandle(pi.hProcess);

       end;

end;



procedure TForm1.Button1Click(Sender: TObject);

begin

     DeleteSelf();



     //comment out to close when program is closed or uncomment

     //to close the file instantly then delete

     Close;

end;



end.