String an Position x ausgeben lassen

[SaFu]

Habe diesen Codeschnipsel gefunden mit der ich mir die Position ausgeben lasse an der der String gefunden wird

Delphi-Quellcode:

function ScanFile(const FileName: string; const forString: string; caseSensitive: Boolean): Longint;
const
  BufferSize = $8001;  { 32K+1 bytes }
var
  pBuf, pEnd, pScan, pPos: PChar;
  filesize: LongInt;
  bytesRemaining: LongInt;
  bytesToRead: Integer;
  F: file;
  SearchFor: PChar;
  oldMode: Word;
begin
  { assume failure }
  Result := -1;
  if (Length(forString) = 0) or (Length(FileName) = 0) then Exit;
  SearchFor := nil;
  pBuf      := nil;
  { open file as binary, 1 byte recordsize }
  AssignFile(F, FileName);
  oldMode  := FileMode;
  FileMode := 0;    { read-only access }
  Reset(F, 1);
  FileMode := oldMode;
  try { allocate memory for buffer and pchar search string }
    SearchFor := StrAlloc(Length(forString) + 1);
    StrPCopy(SearchFor, forString);
    if not caseSensitive then  { convert to upper case }
      AnsiUpper(SearchFor);
    GetMem(pBuf, BufferSize);
    filesize       := System.Filesize(F);
    bytesRemaining := filesize;
    pPos           := nil;
    while bytesRemaining > 0 do
    begin
      { calc how many bytes to read this round }
      if bytesRemaining >= BufferSize then
        bytesToRead := Pred(BufferSize)
      else
        bytesToRead := bytesRemaining;
      { read a buffer full and zero-terminate the buffer }
      BlockRead(F, pBuf^, bytesToRead, bytesToRead);
      pEnd  := @pBuf[bytesToRead];
      pEnd^ := #0;
      pScan := pBuf;

      while pScan < pEnd do
      begin
       if not caseSensitive then { convert to upper case }
          AnsiUpper(pScan);
        pPos := StrPos(pScan, SearchFor);  { search for substring }

          if pPos <> nil then
          begin { Found it! }
            Result := FileSize - bytesRemaining +
              Longint(pPos) - Longint(pBuf);
            Break;
          end;

        pScan := StrEnd(pScan);
        Inc(pScan);
      end;

      if pPos <> nil then Break;
      bytesRemaining := bytesRemaining - bytesToRead;
      if bytesRemaining > 0 then
      begin
        Seek(F, FilePos(F) - Length(forString));
        bytesRemaining := bytesRemaining + Length(forString);
      end;
    end; { While }

  finally
    CloseFile(F);
    if SearchFor <> nil then StrDispose(SearchFor);
    if pBuf <> nil then FreeMem(pBuf, BufferSize);
  end;
end; { ScanFile }


// Search in autoexec.bat for "keyb" with case insensitive
// In der autoexec.bat nach "keyb" suchen

procedure TForm1.btn2Click(Sender: TObject);
begin
  Position:= ScanFile('C:\Users\test.txt', edt1.Text, False);
  ShowMessage(IntToStr(Position));
end;

War glaube ich zu umständlich oder