Delphi self-deleting program

Question

How do I auto-delete, my Delphi program? I tried this code:

procedure DeleteSelf;
var
  module : HMODULE;
  buf : array [ 0 .. MAX_PATH - 1 ] of char;
  p : ULONG;
  hKrnl32 : HMODULE;
  pExitProcess, pDeleteFile, pFreeLibrary : pointer;
begin
  module := GetModuleHandle ( nil );
  GetModuleFileName ( module, buf, sizeof ( buf ) );
  CloseHandle ( THandle ( 4 ) );
  p := ULONG ( module ) + 1;
  hKrnl32 := GetModuleHandle ( 'kernel32' );
  pExitProcess := GetProcAddress ( hKrnl32, 'ExitProcess' );
  pDeleteFile := GetProcAddress ( hKrnl32, 'DeleteFileA' );
  pFreeLibrary := GetProcAddress ( hKrnl32, 'FreeLibrary' );
  asm
    lea eax, buf
    push 0
    push 0
    push eax
    push pExitProcess
    push p
    push pDeleteFile
    push pFreeLibrary
    ret
  end;
end;

But it does not work, do not delete the file. My program is console. Thanks!