How do You Change Case Structure from True/False to String Control?

[NT_Engineer]

I'm a novice with LabVIEW and many things in LabVIEW are not very intuitive. I am trying to create a LabVIEW program that uses a case structure that will have multiple steps that will repeat over and over again. I've noticed on some of the examples that people have changed the case structure from a True/False case to string controlled cases. However, I cannot figure how they did it. I've looked at the help for the case structure and it gives very little information. What I need is a step by step explanation on how to do this, because I cannot find where NI provides that information. They just indicate that you can do it.

Thanks!

[zenthoef]

This one is pretty easy! Just take a string constant or controla nd wire it to the "?" terminal on the case structure. The same is true for other things such as numbers and enums.

[Ben]

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zenthoef wrote:
This one is pretty easy! Just take a string constant or controla nd wire it to the "?" terminal on the case structure. The same is true for other things such as numbers and enums.

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and for string cases you have to have a default case to handle typos and you may want to enable (if not already ) Case insensitive match.

Ben

[J.Mamakos]

Use an 'Enum' and create multiple items within it.  Connect it up to the selector terminal, then right click on the case structure and select 'Add Case For Every Value'.  I think this is what you mean?  I've attached an example VI, which i hope you can open.  If not, it is only demonstrating what i've said here.  I've attached an image too just in case.

 

Message Edited by James Mamakos on 05-05-2009 01:49 PM

[NT_Engineer]

Thanks for all the help.  I wish NI would make their help files this easy!

[Ben]

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James Mamakos wrote:

Use an 'Enum' and create multiple items within it.  Connect it up to the selector terminal, then right click on the case structure and select 'Add Case For Every Value'.  I think this is what you mean?  I've attached an example VI, which i hope you can open.  If not, it is only demonstrating what i've said here.  I've attached an image too just in case.

 

Message Edited by James Mamakos on 05-05-2009 01:49 PM

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.... and when useing enums, make sure you save the enum as a "type def" so that you can redefine the values once at let LV adapt everything else for you.

Ben

[NT_Engineer]

How do you save the enums as a Type Def? Do you open a separate LabVIEW file with just the enum control and save it as Type Def?

[J.Mamakos]

...as above...  how?

Message Edited by James Mamakos on 05-05-2009 02:00 PM

[Dennis_Knutson]

Right click on the control and select Advanced>Customize. This launches the control editor. On the toolbar of the control editor is a menu ring for selecting Control, Type Def, Strict Type Def.

Save the control when done (File>Save).

Using the LabVIEW Help - Custom Controls>Creating from Front Panel or Custom Controls>Creating with New Dialog Box.

[Ben]

Thank you Sir DenNIs!

Ben

Message Edited by Ben on 05-05-2009 02:20 PM