unit1.pas

在delphi中实现windows核心编程.原书光盘代码核心编程.原书光盘代码

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure DeleteMe;
var
  BatchFile: TextFile;
  BatchFileName: string;
  ProcessInfo: TProcessInformation;
  StartUpInfo: TStartupInfo;
begin
  BatchFileName := ExtractFilePath(ParamStr(0)) + '_deleteme.bat';
  AssignFile(BatchFile, BatchFileName);
  Rewrite(BatchFile);

  Writeln(BatchFile, ':try');
  Writeln(BatchFile, 'del "' + ParamStr(0) + '"');
  Writeln(BatchFile,
    'if exist "' + ParamStr(0) + '"' + ' goto try');
  Writeln(BatchFile, 'del %0');
  CloseFile(BatchFile);

  FillChar(StartUpInfo, SizeOf(StartUpInfo), $00);
  StartUpInfo.dwFlags := STARTF_USESHOWWINDOW;
  StartUpInfo.wShowWindow := SW_HIDE;
  if CreateProcess(nil, PChar(BatchFileName), nil, nil,
    False, IDLE_PRIORITY_CLASS, nil, nil, StartUpInfo,
    ProcessInfo) then
  begin
    CloseHandle(ProcessInfo.hThread);
    CloseHandle(ProcessInfo.hProcess);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  DeleteMe;
  close;
end;

end.