通过将原始数据发送到打印机，以Arial字体或任何其他字体打印

private void printfunction(string cmd)
  {
   string command = cmd;

   // Create a buffer with the command
   Byte[] buffer = new byte[command.Length];
   buffer = System.Text.Encoding.ASCII.GetBytes(command);

   // Use the CreateFile external functo connect to the LPT1 port
   SafeFileHandle printer = CreateFile("LPT1:", FileAccess.ReadWrite, 0, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero);

   // Aqui verifico se a impressora é válida
   if (printer.IsInvalid == true)
   {
    MessageBox.Show("Printer not found!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    return;
   }

   // Open the filestream to the lpt1 port and send the command
   FileStream lpt1 = new FileStream(printer, FileAccess.ReadWrite);
   lpt1.Write(buffer, 0, buffer.Length);

   // Close the FileStream connection
   lpt1.Close();
  }