sfc.exe mit CreateProcess() starten klappt nicht

[Shark99]

Ich versuche unter Delphi 7 sfc.exe /verifyonly mit CreateProcess zu starten und die Ausgabe in ein TMemo umzuleiten. Den Code dazu habe ich hier im Forum gefunden. Es klappt jedoch nicht. Wenn ich mit cmd.exe eine Console aufmache und sfc.exe /verifyonly starte kommt Beginning system scan. This process will take some time. Mache ich es über meine App, dann kommt statt dessen Windows Resource Protection could not start the repair service. Es kann nicht an Zugriffsrechten liegen, weil bei meinem Win7 x64 UAC aus ist. Woran liegt es? Habe Beispielprojekt angehängt.

Delphi-Quellcode:

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Memo2: TMemo;
    Edit1: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function GetConsoleOutput(const Command: String; var Output,Errors: TMemo): Boolean;
var
  StartupInfo: TStartupInfo;
  ProcessInfo: TProcessInformation;
  SecurityAttr: TSecurityAttributes;
  PipeOutputRead: THandle;
  PipeOutputWrite: THandle;
  PipeErrorsRead: THandle;
  PipeErrorsWrite: THandle;
  Succeed: Boolean;
  Buffer: array [0..255] of Char;
  NumberOfBytesRead: DWORD;
  Stream: TMemoryStream;
begin
  //Initialisierung ProcessInfo
  FillChar(ProcessInfo, SizeOf(TProcessInformation), 0);

  //Initialisierung SecurityAttr
  FillChar(SecurityAttr, SizeOf(TSecurityAttributes), 0);
  SecurityAttr.nLength := SizeOf(SecurityAttr);
  SecurityAttr.bInheritHandle := true;
  SecurityAttr.lpSecurityDescriptor := nil;

  //Pipes erzeugen
  CreatePipe(PipeOutputRead, PipeOutputWrite, @SecurityAttr, 0);
  CreatePipe(PipeErrorsRead, PipeErrorsWrite, @SecurityAttr, 0);

  //Initialisierung StartupInfo
  FillChar(StartupInfo, SizeOf(TStartupInfo), 0);
  StartupInfo.cb:=SizeOf(StartupInfo);
  StartupInfo.hStdInput := 0;
  StartupInfo.hStdOutput := PipeOutputWrite;
  StartupInfo.hStdError := PipeErrorsWrite;
  StartupInfo.wShowWindow := sw_Hide;
  StartupInfo.dwFlags := STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;

  if CreateProcess(nil, PChar(Command), nil, nil, true,
  CREATE_DEFAULT_ERROR_MODE or CREATE_NEW_CONSOLE or NORMAL_PRIORITY_CLASS, nil, nil,
  StartupInfo, ProcessInfo) then begin
    result:=true;
    //Write-Pipes schließen
    CloseHandle(PipeOutputWrite);
    CloseHandle(PipeErrorsWrite);

    //Ausgabe Read-Pipe auslesen
    Stream := TMemoryStream.Create;
    try
      while true do begin
        succeed := ReadFile(PipeOutputRead, Buffer, 255, NumberOfBytesRead, nil);
        if not succeed then break;
        Stream.Write(Buffer, NumberOfBytesRead);
      end;
      Stream.Position := 0;
      Output.Lines.LoadFromStream(Stream);
    finally
      Stream.Free;
    end;
    CloseHandle(PipeOutputRead);

    //Fehler Read-Pipe auslesen
    Stream := TMemoryStream.Create;
    try
      while true do begin
        succeed := ReadFile(PipeErrorsRead, Buffer, 255, NumberOfBytesRead, nil);
        if not succeed then break;
        Stream.Write(Buffer, NumberOfBytesRead);
      end;
      Stream.Position := 0;
      Errors.Lines.LoadFromStream(Stream);
    finally
      Stream.Free;
    end;
    CloseHandle(PipeErrorsRead);

    WaitForSingleObject(ProcessInfo.hProcess, INFINITE);
    CloseHandle(ProcessInfo.hProcess);
  end
  else begin
    result:=false;
    CloseHandle(PipeOutputRead);
    CloseHandle(PipeOutputWrite);
    CloseHandle(PipeErrorsRead);
    CloseHandle(PipeErrorsWrite);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  GetConsoleOutput(edit1.Text,memo1,memo2);
end;

end.