labview-dll-error-handling

Fixed: How To Fix Labview Dll Error Handling.

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    Last updated: Monday, January 02, 2021Publication: Saturday, December 12, 2020Written by Jason D. Sommerville

    Version 1.2.1 of Live Was HDF5 wasn’t that hard to make, but this idea solves a problem that has been around for a long time for those who haven’t had experience with Live HDF5. The problem is that the LabVIEW Multithreaded Model Model DLL can be obtained from any LabVIEW thread in the execution system supported by the calling VI. Unfortunately, many external libraries, including several smaller ones such as the Windows API and of course HDF5, use thread-local data state for error tracking, among other things. The end result of this is literally that if a Call Library Function Node (CLFN) is configured to run on any thread, and its execution throws an error, and a function call is required to get information about the error, this ensures that it’s error recovery. ring. called by the same thread as the first one. In some cases, where a restore error does not explicitly occur on the same binding, incorrect error information is returned. Pri The example below of calling a specific (deprecated) OpenFile Windows API function illustrates this capability. (Why would you want to be able to implement OpenFile this way in LabVIEW? I have an idea, no. It’s not just that.)

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    Case 1 (incorrect): Can’t properly handle thread-local calls in external code

    The solution suggested by NI and most of the LabVIEW developers is to carefully modify the user interface calls. I suspect this is because this option exists and it will actually solve the problem. (Interestingly, in the case of a Windows API call, LabVIEW doesn’t have the ability to schedule the API calls that come between OpenFile and GetLastError, which is confusing in various ways. But it’s much more common to do so, such as calling their non-Windows library, not the UI, that’s no problem.)

    labview dll error handling

    Option 2 (OK): ni’s recommended way of handling thread-local problems in external functions

    labview dll error handling

    What I’ve been able to figure out is a good reason why this is a good idea. Why would I need to push on a UI thread that could potentially be sweaty?An initially time-consuming project in a DLL function. For example, what if I link to a library on disk access to successfully write potentially large files?

    Will we get the efficiency of the non-blocking digits from Option 1 with the right type of error handling from Option 1 in only two ways? The only way is to put the contact function in another DLL, as shown in option 3. By calling And openfile GetLastError in the outer call, we ensure that GetLastError runs on the same thread and in the correct order. Of course, before doing this, we need to consider the overhead of writing and compiling a custom DLL to make this possible.

    Couple of options (better but hard to implement): Write some external function that encapsulates your calls and error handling.

    This is, of course, exactly what the Live HDF5 library is designed for. Unfortunately, this required writing wrapper functions for 400 given HDF5 calls. You might be wondering, yes, the default automatic generation was used.

    ExceptWell, in some cases it may be more beneficial to pass the entire error cluster to a wrapper DLL. This is how Live HDF5 handles errors, as shown in the demo below. In my case, this is because the error handler for HDF5, H5Ewalk, returns a lot more information than just a single code, and I’ve decided that it’s easier to consistently control the population of the labview error cluster by accessing it in C code. To run a The error cluster parameter in each CLFN must be set to type Adapt To Handles (by value). Make sure you’re using the correct Struct C type definition, and if you’re skeptical, use the CLFN configuration

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