Get Sequence context from ActiveX reference

Hello,
I am passing to MFC DLL ActiveX reference to freshly created new execution. In examples it is shown how to pass "ThisContext" to DLL (struct IDispatch *seqContextDisp) but i need something like :
- create new execution, save ActiveX reference in local variable
- pass reference to DLL
- in DLL get from reference sequence context and perform some operations (get/set vaiables, etc.)
Thanks.

I'm not sure I fully understand the question but I'll take a stab at it anyways. First if you want to have seq context of the new execution; review my sample seq file I sent along. In this seq file you can pass seq context of the new execution to a dll in either seq/execution.
If this is a simple "C" type question the prototype/code would look something like the .cpp file I attached.
My stuff may have a couple different parameters!
If I misunderstoo the question you might want to send me what you got so far... It might be eaiser for me to see what you are tyring to do and I can finish an example for you.
[email protected]
Attachments:
Sequence_File2.seq ‏16 KB
handleexports.cpp ‏9 KB

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Solved!
Go to Solution.

You need to close EVERY ActiveX reference you open. If you don't you'll end up with some Excel processes running even after LabVIEW exits. You can see them in Task Manager.
I, personally, don't like the LabVIEW Report Generation Tool Kit for working with Excel. I don't think it's flexible enough. I have a growing library of VIs that I've written that open, manipulate, and close Excel. Some references I pass from VI to VI and some I close right after I use them. It all depends on what I'm doing. If I want to enter read or write data from/to a certain range I'll get the range reference, read or write the data, then close it right away because I have no use for it any more. On the other hand, when I open Excel or a Workbook I keep the reference until I'm done, which could be later in the program.
1) When I go through my subVI once, pointing to one workbook, I'll get one set of references "created" or "opened" or whatever you call it when ActiveX references spring into existence. Now, when I exit the subVI, is it going to automatically try to "close" those ActiveX references? I don't suppose so, since subVI's stay in memory until the calling VI closes.
2) Now, I come back into my subVI a second time. New workbook gets created, so I get new references. Ok, fine. Uh oh! What happened to those old references? I suppose that if I didn't somehow save them off, I've probably lost the ability to get them back (maybe I'm wrong, but I don't need them back), but is LabVIEW going to "close" those old references (from previous times through the subVI) because I can't get to them anymore? Won't that cause the dreaded error 3001? If LabVIEW is not going to "close" them, what in tarnation happens to them (the old C programmer in me creeping back out)?? Now it's some oddball, orphaned reference, floating out there, hogging memory, waiting to make something crash intermittently and be a debugging nightmare?
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1) No, LabVIEW will NOT close those references. You need to make sure that happens.
2) You can save the references in a functional global or use a class but if you're not going to save them close them as soon as you're done with them.
3) Your user should not be able to close your LabVIEW application without it going through the shutdown routine you've created for your program. The ABORT button should never be exposed to the user and you should capture and discard the panel close event so your program ALWAYS shuts down is an orderly fashion. If you don't you will have fragments of Excel hanging around in your operating system and will have to kill those processes using Task Manager. That should only be a problem during development, not once deployed.
I used to program in C and Assembly many moons ago. You should have seen my first LabVIEW code. I go back and look at it just so I can see how far I've come in the last 12 years. I feel your pain.
Kelly Bersch
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