public void PrinterNotifyWaitCallback(Object state, bool timedOut)
{
if (_printerHandle == IntPtr.Zero)
{
return;
}
#region read notification details
_notifyOptions.Count = 1;
int pdwChange = 0;
IntPtr pNotifyInfo = IntPtr.Zero;
bool bResult = FindNextPrinterChangeNotification(_changeHandle, out pdwChange, _notifyOptions, out pNotifyInfo);
//If the Printer Change Notification Call did not give data, exit code
if ((bResult == false) || (((int)pNotifyInfo) == 0))
{
return;
}
//If the Change Notification was not relgated to job, exit code
bool bJobRelatedChange = ((pdwChange & PRINTER_CHANGES.PRINTER_CHANGE_ADD_JOB) == PRINTER_CHANGES.PRINTER_CHANGE_ADD_JOB) ||
((pdwChange & PRINTER_CHANGES.PRINTER_CHANGE_SET_JOB) == PRINTER_CHANGES.PRINTER_CHANGE_SET_JOB) ||
((pdwChange & PRINTER_CHANGES.PRINTER_CHANGE_DELETE_JOB) == PRINTER_CHANGES.PRINTER_CHANGE_DELETE_JOB) ||
((pdwChange & PRINTER_CHANGES.PRINTER_CHANGE_WRITE_JOB) == PRINTER_CHANGES.PRINTER_CHANGE_WRITE_JOB);
if (!bJobRelatedChange)
{
return;
}
#endregion
#region populate Notification Information
//Now, let us initialize and populate the Notify Info data
PRINTER_NOTIFY_INFO info = (PRINTER_NOTIFY_INFO)Marshal.PtrToStructure(pNotifyInfo, typeof(PRINTER_NOTIFY_INFO));
int pData = (int)pNotifyInfo + Marshal.SizeOf(typeof(PRINTER_NOTIFY_INFO));
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;
try
{
_spooler = new PrintQueue(new PrintServer(), _spoolerName);
pji = _spooler.GetJob(intJobID);
if (!objJobDict.ContainsKey(intJobID))
{
objJobDict[intJobID] = pji.Name;
}
strJobName = pji.Name;
}
catch
{
pji = null;
objJobDict.TryGetValue(intJobID, out strJobName);
if (strJobName == null)
{
strJobName = "";
}
}
if (OnJobStatusChange != null)
{
//Let us raise the event
OnJobStatusChange(this, new PrintJobChangeEventArgs(intJobID, strJobName, jStatus, pji));
}
}
}
#endregion
#region reset the Event and wait for the next event
_mrEvent.Reset();
_waitHandle = ThreadPool.RegisterWaitForSingleObject(_mrEvent, new WaitOrTimerCallback(PrinterNotifyWaitCallback), _mrEvent, -1, true);
#endregion
}
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
}
public static extern bool FreePrinterNotifyInfo([In] ref PRINTER_NOTIFY_INFO pPrinterNotifyInfo);
