Accessing cluster elements from a cluster reference

[girish53]

I am passing a cluster reference to a subvi. In the subvi I would like get/change values of individual elements of the cluster. How do I get/change value an element by name? When I use unbundle by name I get wire error. 

Thank you.

Girish

[Jacobson-ni]

You can feed that reference into a property node and use the Value property to read/write data.

[girish53]

When I connect to a property node, I don't get the list of elements in the cluster. 

I have elements like baud rate, parity etc. which do not show up in the choice list. What is the property Value anyway? 

Girish

[Jacobson-ni]

The reference is a pointer to some cluster on a front panel. The Value property is the value of that cluster. You should be able to right-click what you have and change to read and then unbundle the Value output of the property node.

[ZYOng]

You need to use the type def to tell the subVI what's in your cluster.

[Kyle97330]

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@ZYOng wrote:

You need to use the type def to tell the subVI what's in your cluster.

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That's true for generalized cluster references, but not for "Strict" references.  It depends on the reference and how it was copied around.

[paul_cardinale]

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@girish53 wrote:

When I connect to a property node, I don't get the list of elements in the cluster. 

I have elements like baud rate, parity etc. which do not show up in the choice list. What is the property Value anyway? 

Girish

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Change that Value property to "Read", then wire it to an unbundler.

[Intaris]

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@Kyle97330 wrote:

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@ZYOng wrote:

You need to use the type def to tell the subVI what's in your cluster.

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That's true for generalized cluster references, but not for "Strict" references.  It depends on the reference and how it was copied around.

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This is a possible race condition though, generally not 100% safe as other code accessing the cluster (read or write) can act on the data in the time period between reading and writing via property node in your diagram.