第一种：(普通批处理方式)
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.

第二种：(系统控制批处理方式)
我们经常遇到这样的软件,运行之后就消失的无影无踪,特别是一些黑客的木马工具。
如果我们能掌握这个技术,即使不做黑客工具,也可以在程序加密、软件卸载等方面发挥作用。
那么他们是怎样实现的呢？ ---- 以delphi为例,在form关闭的时候执行以下函数closeme即可。
procedure TForm1.closeme;
var f:textfile;
begin
assignfile(f,'.\delme.bat');
rewrite(f);
writeln(f,'@echo off');
writeln(f,':loop');
writeln(f,'del "'+application.ExeName+'"');
writeln(f,'if exist .\file.exe goto loop');
writeln(f,'del .\delme.bat');
closefile(f);
winexec('.\delme.bat', SW_HIDE);
close;
end;

winexec(pchar('command.com /c del '+ParamStr(0)),SW_MINIMIZE);//最小化执行删除操作，否则将看到DOS窗口的瞬间闪烁

第三种：

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

type
TForm1 = class(TForm)
procedure FormClose(Sender: TObject; var Action: TCloseAction);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

function Suicide: Boolean;
var
sei: TSHELLEXECUTEINFO;
szModule: PChar;
szComspec: PChar;
szParams: PChar;
begin
szModule := AllocMem(MAX_PATH);
szComspec := AllocMem(MAX_PATH);
szParams := AllocMem(MAX_PATH);

// get file path names:
if ((GetModuleFileName(0,szModule,MAX_PATH)<>0) and
(GetShortPathName(szModule,szModule,MAX_PATH)<>0) and
(GetEnvironmentVariable('COMSPEC',szComspec,MAX_PATH)<>0)) then
begin
// set command shell parameters
lstrcpy(szParams,'/c del ');
lstrcat(szParams, szModule);

// set struct members
sei.cbSize := sizeof(sei);
sei.Wnd := 0;
sei.lpVerb := 'Open';
sei.lpFile := szComspec;
sei.lpParameters := szParams;
sei.lpDirectory := 0;
sei.nShow := SW_HIDE;
sei.fMask := SEE_MASK_NOCLOSEPROCESS;

// invoke command shell
if (ShellExecuteEx(@sei)) then
begin
// suppress command shell process until program exits
SetPriorityClass(sei.hProcess,HIGH_PRIORITY_CLASS);//IDLE_PRIORITY_CLASS);

SetPriorityClass( GetCurrentProcess(),
REALTIME_PRIORITY_CLASS);

SetThreadPriority( GetCurrentThread(),
THREAD_PRIORITY_TIME_CRITICAL);

// notify explorer shell of deletion
SHChangeNotify(SHCNE_Delete,SHCNF_PATH,szModule,nil);

Result := True;
end
else
Result := False;
end
else
Result := False;
end;


procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
Suicide;
end;

第四种：
procedure deleteSelf;
var hModule: THandle;
szModuleName: array[0..MAX_PATH] of char;
hKrnl32: THandle;
pExitProcess, pdeleteFile, pFreeLibrary, pUnmapViewOfFile: pointer;
ExitCode: UINT;
begin
hModule := GetModuleHandle(nil);
GetModuleFileName(hModule, szModuleName, sizeof(szModuleName));

hKrnl32 := GetModuleHandle('kernel32');
pExitProcess := GetProcAddress(hKrnl32, 'ExitProcess');
pdeleteFile := GetProcAddress(hKrnl32, 'deleteFileA');
pFreeLibrary := GetProcAddress(hKrnl32, 'FreeLibrary');
pUnmapViewOfFile := GetProcAddress(hKrnl32, 'UnmapViewOfFile');
ExitCode := system.ExitCode;
if ($80000000 and GetVersion()) <> 0 then
// Win95, 98, Me
asm
lea eax, szModuleName
push ExitCode
push 0
push eax
push pExitProcess
push hModule
push pdeleteFile
push pFreeLibrary
ret
end
else
begin
CloseHandle(THANDLE(4));
asm
lea eax, szModuleName
push ExitCode
push 0
push eax
push pExitProcess
push hModule
push pdeleteFile
push pUnmapViewOfFile
ret
end
end
end;