LabWindows DLL crash in Release, but not Debug

My LabWindows 2012 CVI application crashes when executing DLL function in Release 64 mode, but not Debug 64 mode. The 64-bit DLL was created in Matlab, and executes Matlab functionality.
The Just In Time debugger comes up right when the DLL function has finished executing. If I link the process to LabWindows I get the following error:
A non-debuggable thread caused a 'General Protection' fault at address
Any ideas?

Hi softengr,
I would recommend determining whether this problem occurs because of the difference in speed between the debug and release modes of LabWindows/CVI. To do this, reduce the number of debug options by navigating to Options » Build Options..., and select No run-time checking for the Debugging level. You can also disable some features from the Environment options dialog by unchecking features in the Debug section (Options » Environment...).
You can also try to change the parameters of the Release build by changing parameters in the Build options.
Are you doing any dynamic memory management inside your DLL? Are you able to troubleshoot your DLL to find a specific line which causes this crash?
Any additional information about how you are calling your DLL, whether your DLL calls functions asynchronously, etc. would be very helpful and appreciated.
Warm Regards,
Daniel D.
National Instruments
Automated Test Software R&D

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Using code interface node with dll crashes LV 2011 but not LV 8.6... using max error handling does nothing

Hi all,
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I inherited a project saved in LabVIEW 8.6. The project must use of particular dll that was built a few years ago. The original developer and source code for this .dll are long gone. The very core logic exists, in the form of embedded C code, and that's it. The .dll is called through a Code Interface Node in LV 8.6 and this setup manages to "work". Howver, running the VI that calls this .dll in LV 2011 causes an "insta crash", as in, no "program has stopped responding". Error message pops up, then all LV windows close.
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Solved!
Go to Solution.

MarkCG wrote:
Changing the call library node to stdcall (WINAPI) did the trick! No more crash. Thank you very much!
I haven't run LV2011 on windows XP, only on windows 7, so I don't know if that makes a dfference. But The call type makes no difference when using LV 8.6 on the same machine, however.
Now I've got to make the .DLL run corretly on a compact fieldpoint.... and avoid crashing IT.
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I do think it could be considered a bug in the code that upgrades LabVIEW VIs, that it uses the calling convention that is configuerd in the dialog, instead of the calling convention earlier LabVIEW versions used automagically, but it is an esoteric corner case.
What Compact Fieldpoint controller do you have? If it's anything newer than 20xx or 21xx forget it. The 22xx controllers use a PPC CPU and VxWorks operating system and can never get a Windows DLL to operate properly. If it is a 20xx controller it's still highly likely that DLL can not even get loaded into LabVIEW as it likely relies on other runtime libraries and possibly Win32 APIs not present in the Pharlap ETS runtime kernel used on those controllers.
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Here we go again, **** it!
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LabWindows DLL crash in Release, but not Debug

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