How to get a list of Parallel ports on a PC

Problem/Question/Abstract:

How to get a list of Parallel ports on a PC

Answer:

function PortExists(const PortName: string): Boolean;
var
  hPort: HWND;
begin
  Result := False;
  hPort := CreateFile(PChar(PortName), {name}
    GENERIC_READ or GENERIC_WRITE, {access attributes}
    0, {no sharing}
    nil, {no security}
    OPEN_EXISTING, {creation action}
    FILE_ATTRIBUTE_NORMAL or
    FILE_FLAG_OVERLAPPED, {attributes}
    0); {no template}
  if hPort <> INVALID_HANDLE_VALUE then
  begin
    CloseHandle(hPort);
    Result := True;
  end;
end;

{Parallel Ports}
for i := 1 to 9 do
begin
  if PortExists('LPT' + IntToStr(i)) then
    List.Append('Ports: Printer Port (LPT' + IntTostr(i) + ')');
end;