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      AssignFile(datei, ('D:\MessungChannel' + IntToStr(channel)));
      Rewrite(datei);
      for i := 0 to (dataDesc.returnedSamplesPerSeg -1) do
      begin
            BlockWrite(datei, dataArray^[i], 1);  //Daten blockweise eintragen
      end;
      CloseFile(datei);					

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//--------------------------------------
// Speichern
procedure Tmain.SaveToFile;
var
  Stream: TFileStream;
  i: integer;
begin
  SaveToFile.FileName:= format('xyz_%s_ID%d',[ComboBoxText,MyID])

  if SaveToFile.Execute then
  begin
    UpdateMyRecord;
    
    if FileExists(SaveToFile.FileName) then
      DeleteFile(SaveToFile.FileName);
    try
      Stream := TFileStream.Create(SaveToFile.FileName, fmCreate);

      for i:= 1 to length(RecordArray) do
      begin
        if Assigned(Stream) then
          Stream.WriteBuffer(recordArray[i], SizeOf(TMyRecord));
      end;
    finally
      Stream.Free;
    end;
  end;
end;

// Fürs Lesen einfach den Teil von WriteBuffer durch "Stream.ReadBuffer(recordArray[i],SizeOf(TMyRecord));" ersetzen					

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BlockWrite(datei, dataArray[0], SizeOf(Word) * Length(dataArray));