uses Printers, WinSpool;

function PrinterStatusText(Status: Integer): String;
begin
  case Status of
    0:                            Result := 'Waiting';
    JOB_STATUS_PAUSED:            Result := 'Paused';
    JOB_STATUS_ERROR:             Result := 'Error';
    JOB_STATUS_DELETING:          Result := 'Deleting';
    JOB_STATUS_SPOOLING:          Result := 'Spooling';
    JOB_STATUS_PRINTING:          Result := 'Printing';
    JOB_STATUS_OFFLINE:           Result := 'Offline';
    JOB_STATUS_PAPEROUT:          Result := 'Paper Out';
    JOB_STATUS_PRINTED:           Result := 'Printed';
    JOB_STATUS_DELETED:           Result := 'Deleted';
    JOB_STATUS_BLOCKED_DEVQ:      Result := 'Blocked';
    JOB_STATUS_USER_INTERVENTION: Result := 'User Intervention';
    JOB_STATUS_RESTART:           Result := 'Restart';
  else Result := 'Status ' + IntToStr(Status);
  end;
end;

procedure GetJobs(PrinterName: String; JobList: TStrings);
const
  InfoLevel = 1;
  FirstJob = 0;
  LastJob = 19;
var
  Jobs: array [FirstJob..LastJob] of TJobInfo1;
  PrinterHandle, BytesNeeded, I, NumJobs: Integer;
begin
  if OpenPrinter(PChar(PrinterName),PrinterHandle,nil) then begin
    if
EnumJobs(PrinterHandle,FirstJob,LastJob+1,InfoLevel,@Jobs,SizeOf(Jobs),BytesNeed
ed,NumJobs) then begin
      JobList.Clear;
      for I := 0 to NumJobs-1 do
      with Jobs[I] do
        JobList.Add(Format('%s
(%s)',[StrPas(pDocument),PrinterStatusText(Status)]));
    end;
    ClosePrinter(PrinterHandle);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  GetJobs('HP Laserjet 4P',Memo1.Lines);
end;