Comparison of references has failed

Hello

recently, I observed a strange behavior when you try to compare two references referring to the same controls typedefed.

What I want to achieve:

I created a control typedefed (a group of radio buttons with additional information) for use on the front end of the user interface. To manipulate the content, I created a Subvi, which takes a front control reference. The feature is not interest - he controls the values represented by radio buttons, so it is a sort of "advanced radio button control.

Now, I need to address the data structure, the cluster components. The first approach was to compare the labels with a hard-coded string. But then I ignored this first attempt because if someone changes the labels of front-end control the Subvi is no longer visible reason. So I decided to compare the references.

So far the story of presentation...

Now, I have observed some kind of pathological behavior - and this is my question:

Attached to this post is a little demonstration VI which should clearly state the question.
First of all, I created an instance of the control. For simplicity let's call him "MyControl".
Then, I created two references to this object.

The first by selecting the Reference of the Server 'VI' in the 'Application' menu. Done, right click on the reference and choosing the menu option 'Link to .../Pane/MyControl' creates the link to the control. If I open the same menu entry, there is no point of control in the menu (this becomes important later).

The second, that I did a right click on MyControl and selecting the menu item "Create/Reference". As for the first difference this reference shows check marks in the entrance 'Link to... ". " of the right click menu.

Both references seem to be related correctly to control if used to read or write all properties. But if I try to compare using the "Equal?" 'Différent?' or the 'Comparison' palette, result is inequality. Unless we compare the cast type numbers or references by itself.

I know that the value of references may differ in value, but the comparison functions that must manage in resolving references before equality checking. (refer to the documentation for the range of comparison)

Why the references are uneven? Also, right-clicking on the control or its terminal and by selecting "Find all references" in the menu right click - only considers the first of these two references.

Is this a problem of referencing the typedef and contains the structure the typedef? (only typedefed controls behave as described, after that disconnection of the typedef comparison works)

One last thing, I found out: select 'Link to .../Pane/MyControl' in the menu on the right - click with the button of the second reference (the checked input) connects the reference correctly, even for the comparison functions and function "Find all references" . As a result, the checkmarks disappear.

How can I ensure a good related references? Is there a better way - more stable - to refer to a control by a label or a reference?
Is this a bug? I'm using LabView 2011 (without SP1) on a computer laptop win7.


Tags: NI Software

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