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dadreamer last won the day on September 26

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    LabVIEW 2020
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  1. Did you know that this option shows "Autopreallocate arrays and strings" checkbox on VI Properties -> Execution tab? Here's the excerpt from the LabVIEW Help about this setting.
  2. Nice catch, Rolf! It works and I am able to pass the input/output parameters now. RunVI.vi SubVI.vi But it appears that CallInstrument wants to be ran in UI Thread only, else LabVIEW goes big crash. It calls the VI synchronously, waiting until it finishes. That makes me think that this function is not the best idea to use as a callback, because when the user will be interacting with some GUI elements or the program will be running some property/invoke nodes, the callback VI will be waiting UI Thread to become idle, thus we could experience the delay between the events from
  3. I have not, but I just tried and saw no difference in passing strings into CLFN (no matter, if variable, bounded or fixed length). I think, it could be some archaic setting for early LVs before 2009. It even doesn't cause a VI to be recompiled unlike "Type Only Argument" option. It just adds 0x40000 to the flags field in the terminal's DCO properties. Having played with that flags field a little, I can conclude, that it affects IDE behaviour and the terminal look only (to accept some wire(s) or not), but has nothing to do with the compiled code execution. For example, with value of
  4. I'm afraid, we can't use them, because they don't actually run a VI, but "prepare" its state for a run. I guess it's used only for LabVIEW Adapters to be called later from TestStand. VIRefPrepNativeCall requires a VI to be in reserved state, otherwise it returns 1027 error. If we mark the VI as reserved with StatVIRefReserve, then it all goes OK, but the target VI is not executed. Something like this: int32_t StatVIRefReserve(uintptr_t viDS, uint32_t *pVIRef, int32_t unknown, int32_t setUnset); int32_t VIRefPrepNativeCall(uint32_t viRef, uintptr_t *pVIDS); int32_t VIRefFinishNati
  5. All I could find about this is just these two internal functions: CallVIFromDll NCGRunVirtualInstrument For the first one I was able to find .NET prototype only: CallVIFromDll.Invoke(Int32 epIndex, IntPtr lvClient, IntPtr entryPointDataSpace) I'm kind of unsure, how it could be used for the mentioned task. It looks like it doesn't accept the VI parameters. And what do these arguments mean exactly?.. As to the second one, it doesn't accept the VI parameters as well and must be called in UI Thread only. The prototype is as follows: int32_t NCGRunVirtualInstrum
  6. A few WinAPI calls are used there. Besides of that I suppose that assembly blocks should be altered and the hard-coded offsets should be checked as well. It all needs a time to debug on those platforms. I have VMs for Linux/macOS on one machine only, so... Do you really need this on Linux or macOS?
  7. It took a while to code it, but here it is finally. 😉 I have found a way to retrieve the object's pointer soon after the last post in this thread, but had to debug and test everything. Refnum_to_Pointer.rar How it works: As we don't have any public or private API to obtain Base Cookie Jar (BCJ) pointer (that is a LabVIEW global variable), the only way is to examine some function, which uses it, find the place with this global and save the pointer. Actually, this is how we're getting our BCJ. To clarify, it's for Object References only, not for any other references out there.
  8. No, that XNodeDevelopment_LabVIEWInternalTag token doesn't make any effect in LabVIEW for Windows. Moreover it even isn't contained in the executable.
  9. And this is for Windows 😉 I don't want to violate the rules, therefore I'm not going to describe how to achieve this functionality on Windows. If you really want to get it, take a closer look at those Scripting packages, find .lc there, then alter PACKAGE / INCREMENT tokens to LabVIEW_XNodeDevelopment_PKG and COMPONENTS token to LabVIEW_XNodeDevelopment in it. Sure you know what to do next.
  10. You are right, I managed to successfully activate LabVIEW XNode entries with XNodeDevelopment_LabVIEWInternalTag=True token. Here are the screenshots taken on Ubuntu w/ LV 2019 64-bit. And these are from Sierra w/ the same LV. In my case the preferences file was here: - /home/<user name>/natinst/.config/LabVIEW-<LV version>/labview.conf (on Linux); - /Users/<user name>/Library/Preferences/LabVIEW.app <LV version> 64-bit Preferences (on macOS).
  11. I want to remind once again that all this information is just to have fun playing with LabVIEW and not intended for real projects use. I believe you all understand that. 🙂 Not that a big opening here and even not an opening for some ones, but I found this interesting enough to make a thread. As you may already know, when some library is being called using CLF Node, LabVIEW enters ExtFuncWrapper first to do some guard checks to prevent itself from a silent crash and output some error message to the user instead. I've always considered that wrapper boring enough to study, thus never looked
  12. I'm still investigating things, but now I start to think that it's kinda complicated task. I've found no easy-to-use function in LabVIEW internals to get that pointer. And there's another difficulty - the refnum should be matched with the object, it relates to. I see no any refnum info in Heap Peek's object (and its DCO) properties. There's UID in the very first string, so that potentially could be used to identify the object needed. In that case the list of all VI objects should be retrieved (from OH or DS Heap, I guess) and each object should be analyzed to know, if its UID matches our one.
  13. This gives you a pointer to VI Data Space, not to the object's own space. Well, I see what you want to obtain, so I recheck later, whether it's possible to retrieve a pointer to the object itself.
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