[AGAG4]

Estoy es algo similar de lo que te dice Alejandro, puedes agregar los códigos de control por medio de 1 archivo de texto:

Código Delphi [-]
....
var
  Txt       :TextFile;
  try
    AssignFile(txt,'c:\Codigos.txt');
    //Reset
    Write(txt, #27'@');
  finally
    CloseFile(txt);
  end;
 
  if SpoolFile('c:\Codigos.txt','\\Servidor\Facturas') <> 0 then
    ShowMessage('Impresora No esta Preparada');
......
function SpoolFile(const FileName, PrinterName: string): Integer;
var
  Buffer: record
    JobInfo: record // ADDJOB_INFO_1
       Path: PChar;
      JobID: DWORD;
    end;
    PathBuffer: array[0..255] of Char;
  end;
  SizeNeeded: DWORD;
  Handle: THandle;
  PrtName: string;
  ok: Boolean;
begin
  // Flush job to printer
  PrtName := PrinterName;
  if PrtName = '' then
    PrtName := Printer.Printers[Printer.PrinterIndex]; // Default printer name
  ok := False;
  if OpenPrinter(PChar(PrtName), Handle, nil) then
    if AddJob(Handle, 1, @Buffer, SizeOf(Buffer), SizeNeeded) then
      if CopyFile(PChar(FileName), Buffer.JobInfo.Path, True) then
        if ScheduleJob(Handle, Buffer.JobInfo.JobID) then
          ok := True;
  if not ok then
    Result := GetLastError
  else
    Result := 0;
end;

Espero te sirva....Suerte.