DLL woes

[shoneill]

I have written some software to control a CCD camera (attached via SCSI).  This involves calling a DLL supplied by the manufacturer.

All was good, all was running until I tried to "improve" the communication.  To be exact, I needed a feedback from my "Server" VI which was running in the background.  I was getting race conditions between how I believed the instrument was set up and how it was really set up.

Then suddenly the program wouldn't work any more.  Most of the DLL calls are still working as expected, but the most important (reading the data from the CCD) is suddenly broken and brings a nice exception error when the function is called in the DLL.  I've tried setting to UI thread execution (It WAS working as a reentrant DLL call), and I've looked and looked, but I can't find the problem.  I've also already tried copying the entire block diagram to a new VI.  No help.

I include my code here for anyone kind enough to have a lok at it.  It's a work in progress (proof of principle thing) so it's not too clear to understand unfortunately.  If someone sees what I'm doing wrong, please tell me.  I'll buy you a beer.  Honest.

The problem seems to reside in the "C7557 mini IO.vi" in the version which isn't working.  The corresponding VI in the working version is "C7557 IO.vi".

Many many thanks to anyone who can help me.....

Shane.

[shoneill]

In case soemone IS actually crazy enough to have a looka t my code,  the function which no longer works is the Get Measurement function (Function index 10).

This is dependent on many other settings, and one or two wrong settings elsewhere will cause it to crash, but I've been testing and as far as I can see, the other values are all set correctly.......

Shane.