The VISA almost a DLL call

Well, I need to do some tasks finishing with LabVIEW objects inside my DLL. One of these objects is VISA serial port session. In LabVIEW, I can just call VISA VI close and everything goes OK. But in the DLL, it's complicated things because I can't see codes sources (or schema) near visa. I found some information that could use the visa32.dll viClose function in the LabVIEW folder or system32 directory. But when I try to use it with a simple casting to INT32 and passing to int32_t viClose(int32_t objectHandle); It goes to the error on the next launch of the program. Then look at this diagram:

First the program works allright. Second time, it throws the following error:

The program works fine with standard close VI of VISA. But it is impossible to use it inside my C++ library. Then I started thinking, appellant viClose simple is not enough for a proper clean-up of resource VISA. I tried viTerminate before viClose, but the problem remains the same.

So, how can I log VISA properly in the DLL? Perhaps, it is better not to close it at all? There may be memory leaks that...

Hi Dadreamer,

I looked this error and we might be able to fix it by closing the VISA sessions automatically. See this knowledge base article for instructions of the environment of LV:http://digital.ni.com/public.nsf/allkb/A2561CDE98B66DD4862566510078264F?OpenDocument. The corresponding section:

"

  • "In LabVIEW 8.x, select Tools ' Options to display the Options dialog box and select environmentfrom the category list page. "To disable the option, remove the check mark from the check box close automatically to the sessions of VISA and click on the OK button.

Let me know if it works.

Tags: NI Software

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