Memory an error saving SequenceFile generated using API

I am developing an application that creates a SequenceFile using .NET 4.0, c# (2010), Windows 7 Pro x 64, Dual Core 2 .5GHz, 3.0 GB of memory.  Using the EngineClass API, I create a complete SequenceFile based on user/file entries and then save it to disk.  When I finished, I save using SequenceFile.Save (), then release by using ReleaseSequenceFileEx().

For smaller files, there is no problem.  For larger files, I occasionally get the following error:

System.Runtime.InteropServices.COMException (0xFFFFBD98): out of memory.

When the file is saved, it is ~2.8Mb.  Breaking the file is not an option.  I'm not a loop, it comes suddenly.  I tried shutting down VS2010 and restart the computer.  It is still not in line with the savings.

I also had to incorporate the Interop Types false by orientation of NOR.  They said that it's unstable in 4.0.

Questions

1. is there a size limit for the file in the API Save() function?

2. is there a work around using the Save()?

Best regards

Before saving the file try call:

GC. Collect();

GC. WaitForPendingFinalizers();

This will force the garbage collector .NET to recover some memory it can to make room to of unmanaged code in TestStand engine to be able to save the file. Large blocks of contiguous space are necessary when saving the files. This will probably fix your problem, but there's a few things that you may want to consider which would also help.

(1) what version of TestStand do you use?

1 (b) what file format do you use? Binary (binary is set by default for new files created in TestStand 4.0 and higher), XML or INI?

(2) do you have large tables numeric or Boolean in your sequence? If so you might want to consider making initially empty (if it is not really of any data you care to save time editing), then in your sequence, you can programmatically resize it to the size you need when running.

Hope this helps,

-Doug

Tags: NI Software

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