public PrinterQueueMonitor()
{
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_Printer");
foreach (var obj in searcher.Get())
{
string printer = obj["Name"].ToString();
spoolerName.Add(printer);
PrinterModel model = new PrinterModel {
ChangeHandle = IntPtr.Zero, Error = false, Paused = false, PrinterHandle = IntPtr.Zero, PrinterName = printer, Spooler = null, WorkOffline = false
};
printerModels.Add(model);
}
}
public PrinterQueueMonitor(params string[] printerName)
{
spoolerName = printerName.ToList();
foreach (string printer in spoolerName)
{
PrinterModel model = new PrinterModel {
ChangeHandle = IntPtr.Zero, Error = false, Paused = false, PrinterHandle = IntPtr.Zero, PrinterName = printer, Spooler = null, WorkOffline = false
};
printerModels.Add(model);
}
Start();
}
public void Start()
{
foreach (string _spoolerName in spoolerName)
{
Console.WriteLine(_spoolerName);
PrinterModel printerModel = printerModels.FirstOrDefault(o => o.PrinterName == _spoolerName);
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_Printer");
var unit = from ManagementObject x in searcher.Get()
where x.Properties["Name"].Value.ToString() == _spoolerName
select x;
printerModel.WorkOffline = bool.Parse(unit.First()["WorkOffline"].ToString());
int printerstatsu = int.Parse(unit.First()["Printerstatus"].ToString());
if (printerstatsu == 2 || printerstatsu == 0x400000 || printerstatsu == (int)PRINTERSTATUS.PRINTER_STATUS_OUT_OF_MEMORY)
{
printerModel.Error = true;
}
if (printerstatsu == (int)PRINTERSTATUS.PRINTER_STATUS_BUSY || printerstatsu == (int)PRINTERSTATUS.PRINTER_STATUS_PAUSED)
{
printerModel.Paused = true;
}
string wmiQuery = "Select * From __InstanceModificationEvent Within 1 " +
"Where TargetInstance ISA 'Win32_Printer' AND TargetInstance.Name ='" + _spoolerName + "'";
ManagementEventWatcher watcher = new ManagementEventWatcher(new ManagementScope("\\root\\CIMV2"), new EventQuery(wmiQuery));
watcher.EventArrived += new EventArrivedEventHandler(WmiEventHandler);
watcher.Start();
IntPtr _printerHandle = IntPtr.Zero;
OpenPrinter(_spoolerName, out _printerHandle, 0);
if (_printerHandle != IntPtr.Zero)
{
Console.WriteLine(_spoolerName);
printerModel.PrinterHandle = _printerHandle;
//We got a valid Printer handle. Let us register for change notification....
printerModel.ChangeHandle = FindFirstPrinterChangeNotification(printerModel.PrinterHandle, (int)PRINTER_CHANGES.PRINTER_CHANGE_JOB, 0, printerModel.NotifyOptions);
// We have successfully registered for change notification. Let us capture the handle...
printerModel.MrEvent.SafeWaitHandle = new Microsoft.Win32.SafeHandles.SafeWaitHandle(printerModel.ChangeHandle, false);
//Now, let us wait for change notification from the printer queue....
printerModel.WaitHandle = ThreadPool.RegisterWaitForSingleObject(printerModel.MrEvent, new WaitOrTimerCallback(PrinterNotifyWaitCallback), printerModel.MrEvent, -1, true);
}
printerModel.Spooler = new PrintQueue(new PrintServer(), _spoolerName);
foreach (PrintSystemJobInfo psi in printerModel.Spooler.GetPrintJobInfoCollection())
{
objJobDict[psi.JobIdentifier] = psi.Name;
}
}
}
private void WmiEventHandler(object sender, EventArrivedEventArgs e)
{
ManagementBaseObject printer = (ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value;
PrinterModel printerModel = printerModels.FirstOrDefault(o => o.PrinterName == printer["Name"].ToString());
bool newPrinterStatus = bool.Parse(printer["WorkOffline"].ToString());
int printerstatsu = int.Parse(printer["Printerstatus"].ToString());
if (printerstatsu == 2 || printerstatsu == 0x400000 || printerstatsu == (int)PRINTERSTATUS.PRINTER_STATUS_OUT_OF_MEMORY)
{
printerModel.Error = true;
}
if (printerstatsu == (int)PRINTERSTATUS.PRINTER_STATUS_BUSY || printerstatsu == (int)PRINTERSTATUS.PRINTER_STATUS_PAUSED)
{
printerModel.Paused = true;
}
OnPrinterStatusChange?.Invoke(printer["Name"].ToString(), new PrinterChangeEventArgs(printer["Name"].ToString(), printerModel.WorkOffline, printerModel.Error, printerModel.Paused));
printerModel.WorkOffline = newPrinterStatus;
}
public void PrinterNotifyWaitCallback(Object state, bool timedOut)
{
ManualResetEvent Mevent = (ManualResetEvent)state;
PrinterModel printerModel = printerModels.FirstOrDefault(o => o.ChangeHandle == Mevent.Handle);
#region read notification details
printerModel.NotifyOptions.Count = 1;
int pdwChange = 0;
IntPtr pNotifyInfo = IntPtr.Zero;
bool bResult = FindNextPrinterChangeNotification(printerModel.ChangeHandle, out pdwChange, printerModel.NotifyOptions, out pNotifyInfo);
if ((bResult == false) || (((long)pNotifyInfo) == 0))
{
return;
}
bool bJobRelatedChange = pdwChange > 0;
if (!bJobRelatedChange)
{
return;
}
#endregion
#region populate Notification Information
PRINTER_NOTIFY_INFO info = (PRINTER_NOTIFY_INFO)Marshal.PtrToStructure(pNotifyInfo, typeof(PRINTER_NOTIFY_INFO));
long pData = (long)pNotifyInfo + (long)Marshal.OffsetOf(typeof(PRINTER_NOTIFY_INFO), "aData");
PRINTER_NOTIFY_INFO_DATA[] data = new PRINTER_NOTIFY_INFO_DATA[info.Count];
for (uint i = 0; i < info.Count; i++)
{
data[i] = (PRINTER_NOTIFY_INFO_DATA)Marshal.PtrToStructure((IntPtr)pData, typeof(PRINTER_NOTIFY_INFO_DATA));
pData += Marshal.SizeOf(typeof(PRINTER_NOTIFY_INFO_DATA));
}
#endregion
#region iterate through all elements in the data array
for (int i = 0; i < data.Count(); i++)
{
if ((data[i].Field == (ushort)PRINTERJOBNOTIFICATIONTYPES.JOB_NOTIFY_FIELD_STATUS) &&
(data[i].Type == (ushort)PRINTERNOTIFICATIONTYPES.JOB_NOTIFY_TYPE))
{
JOBSTATUS jStatus = (JOBSTATUS)Enum.Parse(typeof(JOBSTATUS), data[i].NotifyData.Data.cbBuf.ToString());
int intJobID = (int)data[i].Id;
string strJobName = "";
PrintSystemJobInfo pji = null;
short shortJobCopies = 1;
uint uintJobTotalPages = 1;
try
{
printerModel.Spooler = new PrintQueue(new PrintServer(), printerModel.PrinterName);
pji = printerModel.Spooler.GetJob(intJobID);
if (!objJobDict.ContainsKey(intJobID))
{
objJobDict[intJobID] = pji.Name;
}
strJobName = pji.Name;
GetJob(printerModel.PrinterHandle, (uint)intJobID, 2, IntPtr.Zero, 0, out uint needed);
if (Marshal.GetLastWin32Error() == ERROR_INSUFFICIENT_BUFFER)
{
IntPtr buffer = Marshal.AllocHGlobal((int)needed);
GetJob(printerModel.PrinterHandle, (uint)intJobID, 2, buffer, needed, out needed);
JOB_INFO_2 jobInfo = (JOB_INFO_2)Marshal.PtrToStructure(buffer, typeof(JOB_INFO_2));
DEVMODE dMode = (DEVMODE)Marshal.PtrToStructure(jobInfo.pDevMode, typeof(DEVMODE));
shortJobCopies = dMode.dmCopies;
uintJobTotalPages = jobInfo.TotalPages;
Marshal.FreeHGlobal(buffer);
}
}
catch
{
pji = null;
objJobDict.TryGetValue(intJobID, out strJobName);
if (strJobName == null)
{
strJobName = "";
}
}
OnJobStatusChange?.Invoke(this, new PrintJobChangeEventArgs(intJobID, strJobName, jStatus, pji, uintJobTotalPages, shortJobCopies));
}
}
#endregion
#region reset the Event and wait for the next event
try
{
printerModel.MrEvent.Reset();
printerModel.WaitHandle = ThreadPool.RegisterWaitForSingleObject(printerModel.MrEvent, new WaitOrTimerCallback(PrinterNotifyWaitCallback), printerModel.MrEvent, -1, true);
}
catch { }
#endregion
}
