Passing a sequenceContext to a LabVIEW DLL

[MF]

    Hello,

I have been having a difficult time passing a TestStand sequenceContext to a LabVIEW DLL. In the LabVIEW DLL, I have tried to set the sequencecontext as both a IDispatch and a LabVIEW Automation Refnum using the "C Calling Convention". On the Test Stand side, I have tried using the TS Object and the sequencecontext as a TS::SequenceContext passing a a pointer and a reference. I have also tried to pass it as an ActiveX object as an ActiveXAutomationIDispatch type and as a reference and as a pointer. Everytime I pass the argument to the DLL, I get an error "-17311; Could not accept the parameters passed in." for the sequenceContext. There are not any good examples in the Test Stand directory and the NI site doesn't have any either. Can someone help me?

Thanks!

[Dennis_Knutson]

I do nothing but call VIs made into dlls. In the build spec, the sequence context is defined as IDispatch Pointer and in TestStand, I pass it ThisContext as the expression. I also use Standard Calling Conventions when I define the VI prototype.

[MF]

    Ok,

I understand I need to identify it as an IDispatch in LabVIEW but in Test Stand, do I pass the sequence as the following:

Category ->  object
Type ->       ActiveX IDispatch Pointer
Pass ->       By Value

Thanks for your help.

Michael Froehlich

[Dennis_Knutson]

Yes. Here's what it looks like in TestStand v2. It appears to work the same in 3.x.

Message Edited by Dennis Knutson on 12-12-2006 06:54 AM

[MF]

    Thanks so much. All works well now.

Regards,

Michael Froehlich
WinSoft Corp