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SupportSupportDiscussions (re...Discussions (re...QuickOPC-ClassicQuickOPC-ClassicQuickOPC.NET QuickOPC.NET Crashing IISCrashing IIS
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 11/13/2011 4:36 PM
 
julian
No Ranking

Joined: 10/4/2011
Posts: 14
We are using the component in an asp.net page (ashx). When more than one client sends requests or one client sends rapid requests the component crashes IIS. The module is msvcr90.dll.

Please let me know what additional information we can provide.

Thanks for any help.
New Post
 11/14/2011 10:50 AM
 
OPC Labs Technical Support
6th Level Poster

Joined: 3/15/2010
Posts: 591
 Modified By OPC Labs Technical Support on 11/14/2011 8:51:13 PM

Hello. These additional details would help:

  • Is this 32-bit or 64-bit system? Which version of IIS?
  • What methods are you calling on the component?
  • Do you have some short sample that allows to reproduce the problem?

Thank you.
New Post
 11/14/2011 11:00 AM
 
julian
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Joined: 10/4/2011
Posts: 14
 Modified By julian on 11/14/2011 9:15:55 PM
The system is running 32 bit windows w/ IIS 7.0.

The only method being called is "ReadItem" inside of a loop. We loop 2 to 8 times per request.

I don't have a short example as this is part of a very large c# class.
New Post
 11/15/2011 6:46 PM
 
julian
No Ranking

Joined: 10/4/2011
Posts: 14
 Modified By julian on 11/16/2011 4:50:40 AM
I was able to get a StackTrace:

System.Runtime.InteropServices.SEHException (0x80004005): External component has thrown an exception.\r\n at OpcLabs.EasyOpc.DataAccess.CDAInnerEngine.ExecuteAlgorithm(CDAInnerEngine* , CSynchronizedAlgorithm* Algorithm)\r\n at OpcLabs.EasyOpc.DataAccess.EasyDAClient.ReadItem(ServerDescriptor serverDescriptor, DAItemDescriptor itemDescriptor)\r\n at iqdata.dataXML.fetch(Boolean demo, String poi, Boolean datapoint) in C:\\Users\\julian\\Development\\iquest\\web\\iqdata\\iqdata\\iqdata\\dataXML.cs:line 114"}
New Post
 11/16/2011 5:47 AM
 
OPC Labs Technical Support
6th Level Poster

Joined: 3/15/2010
Posts: 591

Thanks for more details. I will try to set up a similar thing here and reproduce. Please allow some time for it.
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