viInstallHandler error

[xavi]

viInstallHandler returns a general protection run-time error: Unknown source position, thread id 0x00....
Working with a USB RAW device in LabWindows/CVI 7, VISA 3.1
Any idea?

[Dan_Mondrik]

Is it the call to viInstallHandler itself that causes the error, or is it sometime shortly after the call that VISA crashes? You can use NI Spy to determine this - if viInstallHandler shows a return value, then it wasn't that function call per se.

We've just recently discovered a bug in the event callback part of the USB Passport - this very well may be the same issue. If so, we'll see about making a patch available.

Dan Mondrik
National Instruments

[xavi]

Indeed it's not an error caused by viInstallHandler itself, its return value is 0.
This error takes place in the event callback,
which no longer is executed.

[xavi]

I need to have shortly finished the application, by this I would be very thankful if you informed me as soon as exists a patch for this bug. At the moment I'll use a timer to read the interrupt endpoint, which is not much practical.
Thank you Dan.

[Kristofer_Klemett]

I would like to discuss creating a patch for NI-VISA with you a little bit more. Could you go to http://ni.com/ask, choose the "E-Mail NI" option, and email in your request? Either myself, or a member of our e-mail support team will contact you to discuss this option further. Thanks a lot.

Sincerely,

Kris Klemett
National Instruments