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This works but is bound with troubles. A LabVIEW array is dynamic as LabVIEW is a fully managed programming environment. No it is not .Net managed, at the time the LabVIEW developers designed the basics that are valid until today, .Net was not even an idea on earth, let's not talk about a fact. But it is managed and the LabVIEW runtime handles that all behind the curtains for you. This means that a LabVIEW variable, and especially a handle that arrays and strings are, is only guaranteed to be valid for the duration of the Call Library Node call itself. After that node returns, any passed in array, string or even scalar variable can at any point be resized, relocated or even simply get deallocated. So the pointer that you get in this way can very well get invalidated immediately after that Call Library Node returns. For performance reasons, LabVIEW tries to maintain arrays and strings for as long as possible when it can, but to decide if it can and if it propritizes this rule above other possible rules to improve performance is a tricky business and can even change between LabVIEW versions. It is pretty safe to assume that an array or string wire that you wire through a Call Library Node, doesn't branch into other nodes and is wired to the end of the current diagram structure, is left untouched for the duration of this diagram structure. But even that is not something the LabVIEW management contract guarantees. It's just the most prudent thing to do in almost any case to not sacrifice performance. Once you have a branch in the wire before or after the Call Library Node to retrieve the internal data pointer in the handle, or you do not wire the array data to the diagram structure border, all bets are open to if and when LabVIEW may decide to modify that handle (and consequently invalidate the data pointer you just got).

View File LV muParser LV-muParser provides a simple LabVIEW API for muParser fast math expression parser. A modified version of muParser v2.3.4 is included. It will be installed to your "<LabVIEW>\resource" directory. I have added support for the "!" (not) operator as well as added ":" as a valid character for variable names. You will find the muParser API in the functions palette under "Addons > LAVA > muParser" muParser: https://beltoforion.de/en/muparser/ LV-muParser source on github: https://github.com/rfporter/LV-muParser This package has been tested on Windows 10 & 11 and Ubuntu Linux 20.04. Submitter Porter Submitted 08/25/2017 Category General License Type BSD (Most common)  

It's a skill we are born with over here. Along with back-handed compliments and damning with faint praise.

To all things there is a season. Jeff Kodosky helped found National Instruments and invented LabVIEW. He inspired hundreds of us who shapes its code across four decades. But Jeff says it is time to change his focus. Today, NI announced Jeff’s retirement. He will probably always be noodling around on LabVIEW concepts and will remain open to future feature discussions. But his time as a developer is done. Maybe you didn’t know that? Jeff still slings code, from big features to small bugs. He’s been a developer most of the years, happy to have others manage the release and delivery of his software. I spent over two decades working at his side. He taught me to look for what customers needed that they weren’t asking for, to understand what problems they didn’t talk about because they thought the problems were unsolvable. And he built a team culture that made us all collaborators instead of competitors. Thank you, Jeff, for decades of brilliant ideas and staying the course to see those develop into reality. Your work will continue on as one of the key tools on humanity’s expansion to Mars.

It’s sister function “Get LV Class Path” is similarly glacial for no obvious reason. As is “GetLVClassInfo” from the VariantType library. I’ve wonders if the problem is just that they call functions running in the UI thread for some reason. But it could also be root loop. The only workaround I see is caching; store a set of default-value objects in a lookup table and check against this before calling “Get LV Class Default Value”. I wish NI would put some effort into improving semi-crippled functions like these.