VISA debug

[Achim L.]

Hi all,
I'm using VXIpc871-Systems with NI-VISA rev2.0.5 on about 40 systems.
Every some days my C++ application crashes with an unhandled exception in VISA32.dll.
So I have one system running with Visual Studio debugger activated.
On the call stack I can see a call to viPrintf which causes the exception, like that:

VISA32! 003c8815
VISA32! 003cffa0
VISA32! 003d0064
Call_of_viPrintf_from_my_Function()

P.S.: the version info of the used visa32.dll is:
NI-VISA for Windows 95/NT: VISA32.dll
Version: rev2.0.0.16,
Geändert am: Donnerstag, 28. Januar, 1999, 10:17:14

[Achim L.]

Hi all,
I'm using VXIpc871-Systems with NI-VISA rev2.0.5 on about 40 VXI-based systems, 24h per day.
Every some days my C++ application crashes with an unhandled exception in VISA32.dll.
So I have one system running with Visual Studio debugger activated.
On the call stack I can see a call to viPrintf which causes the exception, like that:

VISA32! 003c8815
VISA32! 003cffa0
VISA32! 003d0064
Call_of_viPrintf_from_my_Function()

Does anybody know if there are VC6.0 debug symbols available for visa32.dll
or is it possible to get a source code snipped of viPrintf() and the functions
used by viPrintf()?

Thanks in advance,
Achim


P.S.: the version info of the used visa32.dll is:
NI-VISA for Windows 95/NT: VISA32.dll
Version: rev2.0.0.16
last change: 28. January, 1999, 10:17:14

P.P.S.: The problem even occures on VISA3.2 systems

[JohnM 64]

Hi Achim,

I have not seen this issue before. What operating system did you try this program with using VISA 3.2? I'd be interested in knowing the OS/driver version combo that seems this error.

john
Applications Engineer

[Achim L.]

Hi John,
Thank you for your response. All systems are running under Windows NT4.0 with SP6a
and Ni-Visa 2.0.5 (or Ni-Visa 3.3 on the pilot installation).

Best regards,
Achim

[JohnM 64]

Hi Achim,

This may have been a problem in earlier versions of VISA that has not occurred for us with the newest versions of the driver with a more recent operating system. Have you tried this program on a computer using Windows XP or 2000 with VISA 3.2?

john

[Achim L.]

Hello John,
I did not yet try to reproduce the behaviour on a newer XP controller but since some days we have one available.
But I would prefer to take a look into the implementation of viPrintf() and viQueryf().
Do you see a possibility to get some source code snippets or debug symbols for the visa32.dll rev2.0.5?

Best regards,
Achim

[JohnM 64]

Hi Achim,

The source code for NI-VISA is proprietary to National Instruments, and we will unfortunately not be able to provide any snippets. I am sorry that we cannot help you in this regard. However, I am very interested to see if this issue has been resolved with a newer version of NI-VISA. If not, we will certainly investigate and correct any bugs encountered. If it is at all possible to try this code on a newer OS with the latest version of VISA, we would be very interested in knowing what happens!

Thank you for your understanding in this. Have a great day!

john

[Achim L.]

Hi John,

Thank you for your reply. I undertstand that NI doesn´t want to publish source code snippets,
but a .pdb debug symbol file would inherently be a great help.
In the meantime I will take an VXIpc-875 with XP and NI-VISA3.3 to see,
if the problem occur here,too. Then I will inform you not later than in one or two weeks,
if the XP pilot installation is still running without crashing.

Have a good week,
Achim