Hello,
I've have a fairly small vision application and the vision VIs
keep crashing labview.
Everything used to be in a single loop, and it worked in that setup, but the
complexity is growing that model was becoming unmanageable, so I set up
parallel loops. When I finished that,
labview started to crash.
At first labview would report that an external library had thrown an
exception. IMAQ Copy was normally the offending VI, but other vision functions
would throw exceptions. IMAQ Read Custom Data was fairly common. These
exceptions were common, usually happening within a minute of starting the VI.
Since image refnums are basically pointers in labview, I had used a semaphore
to prevent the acquisition loop from writing over an image that another part of
the program was reading. When I saw the errors, I modified the program to
prevent any two parts of the program from reading the image at the same time
(even though it seems that should be safe). That change made the errors much less common,
but they would still happen occasionally.
(and to make things more interesting, I let the program run for hours with
execution tracing turned on so I could see which IMAQ copy was causing the
exception, and it didn't crash once.)
Does anybody know how to debug exceptions in the vision library?
Also, recently, the annoying error messages have gone away and labview has just
started crashing without any kind of warning.
Does anybody know a method for debugging labview when the process just dies?
Thank you,
Adam Brewster
