How to subscribe to Printer Spooler Events/ Win32_PrintJob Events using C# ?

Strawhat007 40

Hi,

I am trying to find how to subscribe to Printer Spooler Events and Poll the same from the spooler.
Till now I have only found some C++ API and most of them are VB and PowerShell based solution in the documentation.

Win32_PrintJob : https://learn.microsoft.com/en-us/windows/win32/cimwin32prov/win32-printjob

Can you please tell me if anything is available in C# ? How to subscribe to those events ?
and if you have some sample code regarding the same ?

Thanks,
Chitranshu

Accepted answer

Castorix31 83,206 Reputation points

2023-02-03T04:33:51.17+00:00

The usual way is with FindNextPrinterChangeNotification

You can find samples on Google, like Monitor jobs in a printer queue (.NET)
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2 people found this answer helpful.
Strawhat007 40 Reputation points

2023-02-06T04:56:05.9533333+00:00

Thanks a lot. Will try and hope this works.

Strawhat007 40 Reputation points

2023-02-09T08:41:01.7133333+00:00

Hi Castorix31,

I tried this example above. After debugging I found that after FindNextPrinterChangeNotification call while Unmarshaling the data PRINTER_NOTIFY_INFO is not getting the correct values . All the data[i].Field and data[i].Type is coming as 0. Any idea how to resolve this ?
Any help would be much appreciated.

Castorix31 83,206 Reputation points

2023-02-09T16:30:14.73+00:00

I did some tests and it works for me with this method :

https://web.archive.org/web/20090512133302/http://www.dotnet247.com/247reference/msgs/43/215126.aspx

(for example if data[i].Field == 0x00 (JOB_NOTIFY_FIELD_PRINTER_NAME), I get the right printer name

in

string s = Marshal.PtrToStringUni(data[i].pBuf);

Strawhat007 40 Reputation points

2023-02-10T05:50:49.3766667+00:00

Thanks. It helped, the problem was with the structure of the PRINTER_NOTIFY_INFO_DATA in the code. In link you provided that helped as well.
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How to subscribe to Printer Spooler Events/ Win32_PrintJob Events using C# ?

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