How can I test for the bas unit enterd in a control?

[schaerm]

How can I to create a polymorphic vi where the user can enter either volume or temperature.

how can Labwiev test for the base unit entered

pseudocode example:

input X

if X.base_unit == m^3 do ....... 

thanks for any suggestion to resolve or avoid my problem

[smercurio_fc]

The LabVIEW Help indicates how to deal with Polymorphic Units.

[schaerm]

I know this help page, but it doesen't seem to apply to my problem. I don't want to to the same thing for different units, but LV has to branch depending on the unit the user did enter.

[GerdW · Accepted solution]

Hi schaerm,

you have to dig deeper.

An idea is this one:

The red marked word is containing the unit - in a coded way. Somewhere in the LV help you can find the description of this coding (I remember a chapter on memory representations of all LV datatypes...). (There surely is an easier or better way - but the example is done quic&dirty.)

You can also format the number into a string and analyze the unit here...

Message Edited by GerdW on 02-07-2010 07:21 PM

[schaerm]

Thank you GerdW!

The variant solution works perfect! 

(LV does not allow to format a number with unit to a string)

Best regards Mark 

[GerdW]

Hi schaerm,

"(LV does not allow to format a number with unit to a string)"

Ofcourse it does!

(using a simple FormatIntoString...)

[schaerm]

Sorry, I was testing the the wrong functions (number2nstring)

just getting tired

Best regards Mark