LabVIEW
How to obtain which element changed in a clusters using events?
Solved!
Once you compare the new and old, the resulting structure is the same, but all datatypes are boolean. You could just create a subVI that does some unbundling to built an array of all entries, where you can find the changed one.
(Often, only a few items need a special case, so all you need is pick these while changes in others can be dealt with the default case.)
(Be aware that tools like val(sgnl) can change none or more than one element, so handle it accordingly)
Dynamic registered events might be what you are looking for. As a side note, you don't need to use close reference on any reference that inherits from GObject (so any control classes).
@Jacobson-ni wrote:
Dynamic registered events might be what you are looking for.
Wouldn't you just get the name of the inner cluster instead of the second-level controls?
In the given example, Controls[] only gives two elements, the "checkbox" and "cluster 2". We need events for all three: (1) checkbox, (2) numeric & (3) string.
@Jacobson-ni wrote:
As a side note, you don't need to use close reference on any reference that inherits from GObject (so any control classes).
For more details, have a look at the "exception" paragraph here.
@altenbach wrote:
Wouldn't you just get the name of the inner cluster instead of the second-level controls?
In the given example, Controls[] only gives two elements, the "checkbox" and "cluster 2". We need events for all three: (1) checkbox, (2) numeric & (3) string.
You are correct. If you wanted you could probably just do a recursive search for elements in clusters.
asdasdasd
@Gregory wrote:
It sounds like it will be a very complex user interface to operate with that data structure. Can you upload for 2016 and I'll take a look?
See attachment. The UI isn't too complex.
@altenbach wrote:
Once you compare the new and old, the resulting structure is the same, but all datatypes are boolean. You could just create a subVI that does some unbundling to built an array of all entries, where you can find the changed one.
I suppose this works and is cleaner than what I have, but it would be great if there was a dynamic option that scales with the amount of elements.
@Jacobson-ni wrote:
You are correct. If you wanted you could probably just do a recursive search for elements in clusters.
This gives an array of references to each individual element in the cluster. But how can I know from this which has changed?
Not the prettiest peace of code, but effective.
Use the array to find the first true. Then use that to index a label, reference, or whatever...
Note that if you signal values, there can be 0..n changed elements instead of always 1.
Search LabVIEW like a graph!
@Basjong53 wrote:
@Jacobson-ni wrote:
You are correct. If you wanted you could probably just do a recursive search for elements in clusters.
This gives an array of references to each individual element in the cluster. But how can I know from this which has changed?
You can feed that array of references into the register for event node. That event will trigger on value change of any individual element and give you a reference to the specific element that was changed.
