How to detect the changing of a value in side a cluster of an array?

[Thang Nguyen]

Hi,

I have an array of clusters. There are multiple of types of control inside these clusters (number, string, enum, boolean). If I use event structure, I can manage to find out which cluster changes and which control changes but I cannot get the actual value of that cluster. I don't know how to get the reference of the cluster.

Could you please give me a hint?

This is the part of my code:

Best regards,

Thang Nguyen

Edited May 6, 2010 by Thang Nguyen

[Francois Normandin]

but I cannot get the actual value of that cluster.

Hi Thang,

I'm not sure I understand... but can't you just take the "Index Array" primitive to extract the cluster from NewVal?

[Thang Nguyen]

I am sorry making you confuse. I mean I want to get the value of the control which has been updated. I can index the cluster but I cannot index the control inside that cluster.

[Francois Normandin]

I am sorry making you confuse. I mean I want to get the value of the control which has been updated. I can index the cluster but I cannot index the control inside that cluster.

In that case, you can use the OpenG Variant palette to get the data you want, "Cluster to Array of VData" in particular.

If your cluster's data is all from the same datatype, you can typecast it. If not, then Variant is all you can have.

[Minh Pham]

my simple example, might explain ur requirements to some extent

getchangesfromcluster.vi

[Francois Normandin]

my simple example, might explain ur requirements to some extent

Here is what I meant.

getchangesfromcluster_2.vi (LV 8.6)

Hopefully, the linkage to user.lib OpenG is correct.

[Thang Nguyen]

Thank you for all of your helps.

@Minh: I like Dr Slump too

By the way anyone can tell me why there is a convert of boolean type when I use build array function? I have seen this but I don't really understand what it is.

Edited May 7, 2010 by Thang Nguyen

[Grampa_of_Oliva_n_Eden]

Thank you for all of your helps.

@Minh: I like Dr Slump too

By the way anyone can tell me why there is a convert of boolean type when I use build array function? I have seen this but I don't really understand what it is.

Guessing...

The original cluster was a type-def ?

Float over the wire with the wire tool active and help screen open to get the details on the wire.

Ben

[Val Brown]

Any way to implement get changed value in a cluster WITHOUT using OpenG?

[Yair]

That depends on whether or not or you want this to be a generic tool and whether or not the cluster elements are all of the same data type. If they are all of the same type, you can simply use Thang's original suggestion but use the Cluster to Array primitive instead of manually building the array.

If not, LV 8.x should have some VIs in <vi.lib>\utility which allow working with the variant data type. It's possible one of them allows converting a cluster to an array of variants.

[SteveChandler]

Hi,

I have an array of clusters. There are multiple of types of control inside these clusters (number, string, enum, boolean). If I use event structure, I can manage to find out which cluster changes and which control changes but I cannot get the actual value of that cluster. I don't know how to get the reference of the cluster.

Could you please give me a hint?

This is the part of my code:

Best regards,

Thang Nguyen

I think this may be what you want. It will return the index of and value of the changed cluster in an array.

Find Changed Element In Array Of Clusters.vi