Reload sequence file when changes on disk

Hi,
I wrote a custom user interface based on the TestStand (TS) Operator Interface. When I run a sequence file on it and I edit it in the TS editor and I restart an execution, it seems to keep loading the first one when I launch the execution. The only way I can do this is by restarting the GUI.
I read a lot and tried many things and I can’t figure out what do I need to do to have the sequence file reload from disk on the 2nd execution after changes has been made.
I tried many thing and it seems to work when I release the seq file 2 times (!). But, as expected, the 2nd time it get released, I get an error that the file was unloaded from the TestStand Engine. And the weird thing is that I don’t get the error when I run the 1st time or I don’t make changes to the seq file.
Do you see anything wrong? Or have another suggestion how I could achieve that?
Can I see which seq files are in the internal cache? That could be useful to debug.
Thank you.
A code snippet in C# is in attachement.
Attachments:
C#-code.rtf ‏2 KB

A few more ideas:
1) Are you perhaps using this file path with an ApplicationMgr or SequenceFileViewMgr API? You need to make sure that this file is not open by the ApplicationMgr or assigned to a sequencefileviewmgr as well. The applicationmgr or sequencefileviewmgr likely have a strong reference to the sequence file if you have assigned it or opened it with one of their APIs. You might want to try switching entirely to the applicationmgr APIs instead of using the engine APIs as that's probably less likely to lead to conflicts between the two.You could try ApplicationMgr.OpenSequenceFile() and ApplicationMgr.CloseSequenceFile().
2) Have you tried this with a simple, empty sequence file and simple default Sequential process model to verify that it's not related to anything in the sequence file you are running or any code elsewhere in your application? It's possible for code in the sequence or process model itself to be calling GetSequenceFile or GetSequenceFileEx.
3) Have you tried adding a delay between WaitForEndEx() and ReleaseSequenceFileEx()? This is not that likely to be the cause, but perhaps there is additional code required to execute in the execution thread after WaitForEndEx returns before the sequence file can be unloaded. If you add a small delay (i.e. Thread.Sleep(1000) between those lines of code it might work. This would not explain why the file couldn't be reloaded when you use GetSequenceFileEx with the UpdateFromDisk flag though so probably is not the problem.
I tried to reproduce this problem in the sequence editor by running an
execution with a sequence file, closing the sequence file, overwriting
it with a different sequence file and reopening it and I was unable to
reproduce the problem. I got the new file opened as expected. This is
the equivalent situation since there is a completed execution still
open. The sequence editor does not use the Unload flag on
ReleaseSequenceFileEx, but it does use the UpdateFromDisk flag on
GetSequenceFileEx() and it seems to work, correctly loading the new
version of the file in this case. So there must still be something different in your case. I suspect that it's not the execution that has the extra reference in your case, but something else, perhaps the ApplicationMgr or SequenceFileViewmgr.
Also, as a side issue, if you are writing a custom UI, I'd recommend using UIMessages to determine when an execution completes rather than WaitForEndEx(). Basically handle the ApplicationMgr.UIMessageEvent and look for UIMsg_EndExecution and check that the execution associated with the UIMessage is the one you care about. Using the UIMessage like this has a couple of advantages:
1) It allows your UI to go back to executing in it's main message processing loop (Some things will not work correctly without this).
2) It gives you the potential to track and handle running multiple executions in parallel. Just look for and track the multiple UIMessages that such executions generate.
Please let us know if any of these ideas helps or if you are able to figure out the cause of the problem. If you are still unable to get it working and can't figure out the cause, please attach an example program and sequence files which reproduce the issue.
Hope this helps,
-Doug
Message Edited by dug9000 on 03-02-2010 10:03 AM
Message Edited by dug9000 on 03-02-2010 10:04 AM

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