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JKSH

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JKSH last won the day on February 4

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About JKSH

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    Perth, Western Australia

LabVIEW Information

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    LabVIEW 2017
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    2011

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  1. In your code, Loop 1 and Loop 2 are parallel and independent as you expect. Loop 2 not blocked by Loop 1. Loop 2 is blocked by the subVI inside Loop 2. Yes, a subVI is a function. But your function does not return, so it blocks the loop! Not correct. You can execute your subVI by putting it OUTSIDE of Loop 2.
  2. So your subVI contains its own (perpetual) while loop -- is that right? You must understand: A subVI doesn't "finish running" until all of the loops inside the subVI stops. Therefore, Loop 2 in your Main VI cannot continue -- it is blocked because it is waiting for your subVI to "finish running". You don't need that subVI. Just put all the blinking logic in Loop 2. Anyway, it is best to post actual VIs, not screenshots. The screenshots might not show important connections.
  3. Post your code. Without it, we can only rely on our crystal ball.
  4. Make sure you have a Wait node in both loops: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P82BSAS&l=en-AU Without a Wait node, one loop will consume 100% of a CPU core. This could be why your 2nd loop is unable to run.
  5. Rephrasing for clarity: I'm not 100% sure if different executables built using the LabVIEW Application Builder run as different processes or not
  6. As far as Windows is concerned, all the "Application Instances" are still part of the same LabVIEW process. Thus, all application instances (projects) loaded by the same instance of the LabVIEW IDE share the same DLL memory space. You can have "separate copies" of your DLL by loading each project in a separate instance of the LabVIEW IDE (e.g. 32-bit vs. 64-bit, or 2017 vs. 2018). I'm not 100% sure about this part, but I think different executables built using the LabVIEW Application Builder run as different processes, so they would have "separate copies" of your DLL. I'm not 100% sure if different executables built using the LabVIEW Application Builder run as different processes or not. I think they do, which means they would have "separate copies" of your DLL.
  7. Your screenshots reveal the main problem: MATLAB is using an Perl script with regex to parse your header and generate its "thunk" code. Unfortunately, this script can't understand your header because it does not understand all C. (Your header uses "complicated" C) It says, "Unescaped left brace in regex is deprecated here (and will be fatal in Perl 5.30)". "Deprecated" means the functionality is old, and no longer encouraged. "Fatal" means the functionality is completely broken. And we can see that it is very broken indeed, because generated this line which is not valid C code: EXPORT_EXTERN_C uint32_T(__cdecl__))OPEN_USB(voidThunk(void fcn(),const char *callstack,int stacksize) It sounds to me like the Perl script worked fine on the older MATLAB 2011, but is broken by an incompatible upgrade in MATLAB 2018. I'd say that the fastest way to reach your goal is to downgrade MATLAB. (You might be able to get away with downgrading the copy of Perl that MATLAB uses, but I'm not sure if this is possible) Side note: I also noticed that MATLAB is using GCC, not Visual Studio -- Look closely, and you'll see the compiler path: C:\TDM-GCC-64\bin\gcc. This means, even though you've told it to use Visual Studio, it's still using GCC.
  8. What is the first error? The exact message could provide valuable clues. Given that the compiler wasn't auto-detected and that the same files work unmodified on the manufacturer system, I suspect that your compiler hasn't been set up properly. Note: Visual Studio 2015 doesn't install the C/C++ compiler by default; you must explicitly select it during installation. Can you verify that you have a working C/C++ compiler on your PC?
  9. JKSH

    clfn scripting

    LLVM/Clang is truly a marvel! If you need to write wrapper VIs for DLLs, then I think a tool like this is the way to go. However, unless the C API has anything non-trivial like passing a large struct by-value or strings/arrays, you'll end up having to write your own wrapper DLL, right? (side note: I do wish LabVIEW would let us pass Booleans straight into a CLFN by-value...) This struct has the same size as a single int, so you can lie to the CLFN: Say that the parameter type is a plain I32. What are the possible types in the union? If they're quite simple and small, you could tell the CLFN to treat it as a fixed-size cluster of U8s (where the number of cluster elements equals the number of bytes of the union), then Type Cast the value to the right type. The type cast will treat your cluster as a byte array). These would require project-specific scripts that don't fit in a generic automatic tool though. The import wizard was useful for study purposes, to figure out how I should create my wrapper (using a simple sample DLL). That was about it.
  10. For released installers, GitHub provides a very sensible feature called Releases (https://help.github.com/articles/about-releases/). Each GitHub Release is linked against a tag in your repo, and you can have multiple files within each Release -- for example: One installer for your server PC, one installer for your client PCs, and one Linux RT disk image for your cRIO end node (created via the NI RAD Utility). Each file can be up to 2GB, but there is no hard limit on the total disk space occupied by all your Releases. You can also write release notes for each release which gives you a changelog for your whole project. BitBucket doesn't have something as comprehensive as GitHub Releases, but it does provide a Downloads feature where you can put your installers (https://bitbucket.org/blog/new-feature-downloads). It allows up to 2 GB per file.
  11. It used to work, then it stopped: https://forums.ni.com/t5/LabVIEW/Notice-Attach-VI-Snippets-to-post-rather-than-upload/td-p/3660471 Attachments (as opposed to inline images) should be fine, apparently.
  12. In the video, you used the "Abort" button to stop the code. Does the delay still occur if you shut down everything gracefully instead of aborting? Does the delay still occur if you use File > Save All to save your changes before running again? Does the delay still occur if you disable "Separate compiled code" for all your VIs and classes?
  13. I think it makes sense to have separate APIs for text strings and byte array "strings". However, both are still incomplete at the moment. The feature I miss most from LabVIEW Classic is "hex mode" on a string indicator for inspecting the contents of a byte array. I find the Silver palette quite decent Simply setting the background to white (as opposed to "LabVIEW Grey") also does wonders. A note on your last link: That "stark example of modernity" depicts an old widget technology, basically unchanged for over a decade -- it's still maintained today, but only in bugfix mode. Here's an actual example of modernity.
  14. Only for LabVIEW Communications type applications (on PXI). FPGA through RIO (and RIO in general) is not yet supported. Note that Python support is Windows-only. I was hoping to use the Python Node on my LinuxRT cRIO, but no dice. Related: http://www.ni.com/pdf/products/us/labview-roadmap.pdf > Is it using a VI at all? Yes, but the file format is different. > Does it support scripting Not yet (see Roadmap link) > and OO? Mostly. But we can't have type definitions inside classes. > Could I use llb/lvlib/lvlibp/...? llb: Gone in NXG (which is a good thing; these are terrible for source control) lvlib: Yes lvlibp: Not sure > Is the FP resizable?  No. My company finds WebVIs pretty useful. We've started using it for some real projects (but only for the web client -- we still use LabVIEW Classic for other parts of the project, including the web server)
  15. You could save the data to file and then use the System Exec VI to run your choice of Linux chart generation tools like gnuplot (a command-line application) or Matplotlib (a Python library).
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