How can I debug the Call Library Function at run-time

I've written a VI using the CLF to call a DLL which was compiled off-site by another engineer using MSVC. Even though the VI runs without flagging any errors, the VI is not doing what I expect. Is there any way of finding out if the DLL is been called correctly? The first function that is called doesn't return any value, but I think that it should. Does this mean that the DLL is not being called correctly? Note also that the DLL works fine with a JAVA GUI.

Make sure that you are specifying the proper function prototype in the call library function. If you are slightly off the call will not work properly. Ask the offsite engineer to provide you with this data. Another tip is to build the dll with the option to show front panel when called. You can actually popup the dll like you would a subvi. If you design it with test indicators showing on the front panel that is a great way to determine if it is working. Hope this helps.
BJD1613
Lead Test Tools Development Engineer
Philips Respironics
Certified LV Architect / Instructor

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How can I debug the Call Library Function at run-time

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