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#1 Posted : Tuesday, September 28, 2010 9:22:27 PM(UTC)

Trump68  
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Hi! We have a problem printing via Virtual printer from windows service running under Local System account. Is it possible at all?
Meanwile printing from service running under user account is ok.

Edited by moderator Thursday, November 17, 2016 7:18:13 PM(UTC)  | Reason: Not specified

 

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#2 Posted : Wednesday, September 29, 2010 4:01:04 AM(UTC)

Adnan Ismail  
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1. If you try to print form the same service and same user to a different (non-LEADTOOLS) printer, does it work?
2. If you change the "Allow service to interact with desktop" option for the service, does it affect it?
If not, please try to create a small test project (NOT your full application) that only shows how you print and send it to support@leadtools.com with full details on how to reproduce the issue.
 
#3 Posted : Wednesday, September 29, 2010 10:31:17 PM(UTC)

Trump68  
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Seems any printing from win service under Local system dont work at all. At least i cant do it with any printer in Win 7. Have your's team any experience or knowlege about this subject? I cant find any clear answer even from google )))) Thanx in advance.
 
#4 Posted : Thursday, September 30, 2010 3:21:26 AM(UTC)

Adnan Ismail  
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The following Microsoft article discusses some aspects related to printing from services, including information related to the service's logon account:
"How to Print from a Windows Service Using the Windows GDI APIs"
http://msdn.microsoft.com/en-us/windows/ff518439.aspx
 
#5 Posted : Thursday, September 30, 2010 3:34:56 AM(UTC)

Trump68  
Trump68

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Ok thanx for the article. So answer for printing under Local System account is NO. )))))
 
#6 Posted : Thursday, September 30, 2010 6:07:08 AM(UTC)

Adnan Ismail  
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I found some information about this:
There are two ways to print from within a service:
1. Start the service under a Domain User, instead of LOCALSYSTEM, the service will be run under a given user instead of SYSTEM. You already know this part.
2. Instead of printing from the service itself (since we are facing problem when this is applied), the service could impersonate a user and execute another application that will print to the printer. The printing work will be done by this newly executed application since it will have the full interactive user resources and will cause no problem when printing to the printer.
Note: The printer you are using should be accessible to the Domain User you are logged into.
 
#7 Posted : Thursday, September 30, 2010 9:48:36 PM(UTC)

Trump68  
Trump68

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Thanx for your kindness. We are in our team got the same conclusions about. Impersonation of the threads or running service under user accounts seems is only valid solutions.
 
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