refnum more specific class error

[knapkerd]

I am trying to make a general control reference number into the more specific TabControl refnumber, but when I try using the "To More Specific Class" VI with a TabControl reference constant, I get the following error:

Code: 1057

Error:  Type mismatch: Object cannot be type casted to the specified type.

I have posted a picture of what I am trying to do (the false case just passes the boolean through).

Is there a reason that I am not able to nake the more general control reference into a TabControl refnum?

Thanks.

--Robert

Message Edited by knapkerd on 06-19-2008 11:28 AM

Message Edited by knapkerd on 06-19-2008 11:28 AM

[knapkerd]

Sorry, I did not realize the constant was in Japanese.  That is the Tab Control constant refnum.  I have also tried the choose page constant refnum, which retuned the 1055 error or an invalid object.

--Robert

[MikeS81]

Hi Robert,

see the attached example please, it works without an error.

Hope it helps.
Mike

[tst]

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knapkerd wrote:

Is there a reason that I am not able to nake the more general control reference into a TabControl refnum?

---

Yes, there is.
What you're attempting to cast is not the tab control, but its owner, which would be either the panel or the pane. If you use the control reference it should work.

As a side point, a simpler way to do this would simply be to type cast until you get no error (instead of comparing to the class name). If you need more than one class you can wire the string directly into the case structure selector.

[knapkerd]

Wow, thanks a bunch guys.  That makes alot more sense now.

Thanks for the tip tst, I will try that out.

--Robert