Generic Ref! Generic Ref =?

I wrote a small utility to find the first VI in a call chain that has an open front.  To test it, I tried to add the reference to the path and got a strange result.  Note the error message.  After several searches, it turns out that the difference between a reference VI server and a reference of VI, but the error message could be a little clearer.

Steve

No, the difference is between a generic file refnum and a reference of VI. The Refnum of the path service works only on a file refnum and nothing else. The problem here is that the Refnum of the function of the path is an auto adjust function. It adapts to the entrance of wire, but sees while she cannot use this data type and therefore reports the wrong wire.

Technically the error message is just, from the entrance of the Refnum to path function has already adapted to the wired refnum upward. But I agree that it is not easy to.

Your problem is that you assume that the refnum LabVIEW data type is simply a type and the refnum features are compatible with all types of refnum. But it's far from the truth. Each type of refnum is actually it's own class, some are descended from other classes, somewhat as in OOP, but others are completely independent from each other with no common ancestor.

The Refnum of the function of the path is a relic of an era where there is no property and method node in LabVIEW. She could recover the path that is used to open a file specific refnum but it cannot deal with any other refnums LabVIEW.

To get the path of the corresponding VI a VI refnum, you must remove a property node, and then select the property according to.

Tags: NI Software

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