How to get the printer port name

Problem/Question/Abstract:

How to get the printer port name

Answer:

Getting the printer port name:

{ ... }

uses
  printers, winspool;

function GetCurrentPrinterHandle: THandle;
const
  Defaults: TPrinterDefaults = (pDatatype: nil; pDevMode: nil; DesiredAccess:
    PRINTER_ACCESS_USE or PRINTER_ACCESS_ADMINISTER);
var
  Device, Driver, Port: array[0..255] of char;
  hDeviceMode: THandle;
begin
  Printer.GetPrinter(Device, Driver, Port, hDeviceMode);
  if not OpenPrinter(@Device, Result, @Defaults) then
    RaiseLastWin32Error;
end;

procedure TForm1.Button1Click(Sender: TObject);

  procedure Display(const prefix: string; S: PChar);
  begin
    memo1.lines.add(prefix + string(S));
  end;

var
  pInfo: PPrinterInfo2;
  bytesNeeded: DWORD;
  hPrinter: THandle;
  i: Integer;
begin
  for i := 0 to printer.Printers.Count - 1 do
  begin
    Printer.PrinterIndex := i;
    hPrinter := GetCurrentPrinterHandle;
    try
      GetPrinter(hPrinter, 2, nil, 0, @bytesNeeded);
      pInfo := AllocMem(bytesNeeded);
      try
        GetPrinter(hPrinter, 2, pInfo, bytesNeeded, @bytesNeeded);
        Display('ServerName: ', pInfo^.pServerName);
        Display('PrinterName: ', pInfo^.pPrinterName);
        Display('ShareName: ', pInfo^.pShareName);
        Display('PortName: ', pInfo^.pPortName);
      finally
        FreeMem(pInfo);
      end;
    finally
      ClosePrinter(hPrinter);
    end;
  end;
end;