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Showing results for tags 'dvr'.
Found 16 results
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The introduction of parallel, read-only access for DVRs in LabVIEW 2017 adds a great deal of flexibility to using DVRs to monitor values in parallel executions of code. Fo\The downside of this, of course, is the necessity of using the In Place Element (IPE) throughout your code simply to read the va...
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Hi I am reading big TDMS files (~1GB) and I try to minimize memory usage. I read a signal once and I want to keep it for later usage, so I tried to write it to a DVR in the hope that I have only one instance of the data in memory. However the task manager tells me that uses 2 ti...
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Can anyone please tell what a DVR [ Data value reference ] is ? I want to know at what situation it will be used and what are the advantages we get by using DVR. I am really confused in this topic . If someone has any code in which they have worked with DVRs. kindly share it to me. Thank...
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Hi everybody, I'm running into something I don't really understand. Maybe you can help me here ! I've got a LVLIB that is used as an 'Interface': it exposes public VIs which wrap around public functions of a private class (see code attached) . The class is private because I want to...
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I've got some weird stuff going on with a cRIO project I'm working on wanted to get some opinions on it. The basic architecture is a set of classes that do some process. That process registers with a server. The internal data of the process is held in a DVR and the server get's access to that DVR. C...
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I've been working a lot lately with by-reference architectures that still cooperate completely with LabVIEW's implementation of OOP and polymorphism. I've also recently taken an interest in trying to speed up development with secondary providers (similar to GOOP) to enable automatic creation of acce...
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I'm not able to solve DVRs problem. See project file. 1. IO.lvlib exists in two versions: one with single variables + processSimulation.vi that simulates process/machine i.e. takes outputs, calculates process behaviour and writes inputs; the second version of IO.lvlib has variables as IOaliases... -
If I create a DVR in a dynamically launched VI, the DVR ref goes stale when it's passed back to the caller. Anybody know why? See the attached code (LV15) for an example. I don't want to use the ACBR node right now because I want to set some control values of the VI ref on a different diagram t...
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I have some old VIs to which I need to give some love. All the error clusters were unwired, so I am working on that... I am wondering what would be the best practice when it comes to DVR. The IPE structure gives an error cluster on both the left and the right data node. The attached picture sh...
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Hello all! I am new to LAVA, but I have been lurking for many years and have gotten a lot of great advice and insight into LabVIEW programming here. I recently got my CLD, and I'm trying to get a better handle on doing things the Right way. One issue I run into regularly is how to deal with clas...
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Hi, I would like to play an idea out to you about having a composite class put itself back in its owning object by a DVR. Is that a good or a terrible idea? Background I need a class that represents some different LabVIEW files, and which can offer some operations on those files; LVFile.lvc...
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Hi Everyone, This is my first post and am just beginning to learn OOP so please bear with me. I was curious on whether when you use a DVR to encapsulate a class i.e. force an initialization to occur before other methods, and then close the reference to that DVR. Is the class removed from memor...
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I'm working on a large project and have run into a quandary about how to best deal with a large shared data set. I have a set of classes that define 3 data structures. One is for a script read from disk that the application executes. Another is the output data from the program, generated as the s... -
[cross posted to forums.ni.com] Greetings LVOOP masters. I realise this is not a simple question but I would really appreciate your opinion please. I'm trying to make some data handling improvements to a test sequencer application that I've written. User defined tables determine how much dat...
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This thread is a follow up to the point discussed in another thread. I opened a new thread to avoid polluting the previous thread with a second discussion. The link is http://lavag.org/topic/16669-universal-fgv/?p=103311 and I want to react to a message from JohnMc86: Hi, I get the advantage... -
Is it a good practice to keep objects as DVRs within another object as shown below In this case I am loading different drivers within HAL and I have no intentions to void dataflow by using DVRs rather I want to keep less memory for HAL.
