FP default-values and diagram "constants" can change in LabVIEW 6.1 and 7.1

Hi Folks,
      I'm posting here [instead of bug report] first, in case this isn't really a bug.
I created a bunch of similier VIs with type-def cluster inputs, and, on each VI, gave the clusters a default-value.  I'm finding that when these typedefs are changed by removing an element, the default FP values are corrupted.  In my case it gets worse.  When I used these VIs on diagrams, I frequently created a cluster-constant - derived from the VI's cluster-control (described above.)  The remaining elements in the diagram-"constants" are also changing.


x9561 (148441)
10/29/2005 3:40:46 AM
comp.lang.labview 35213 articles. 1 followers. vasusachin24 (1) is leader. Post Follow

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This sounds like it could be a bug AND normal operation.
There are bugs in LV 7.1, 7.0 and possibly earlier that cuases LV to choose the wrong value when bundling and un-bundling by name.
I have been told these are fixed in LV 8.0
See this thread for more details on the bug.
<a href="http://forums.ni.com/ni/board/message?board.id=170&amp;message.id=105455&amp;jump=true" target="_blank">http://forums.ni.com/ni/board/message?board.id=170&amp;message.id=105455&amp;jump=true</a> 
Now as far as the constants that are based on the typedef changing, tht is normal behaviour. As Odd_Modem mentioned, doing an explicit bundle by name is the way to handle this. If you use the same "constant" repeatedly in your code, a sub-VI that does the bundling makes your code a lot easier to read.
Here is a code snippet
<img src="http://forums.ni.com/attachments/ni/130/1982/1/Constant_Icons.JPG"> 
and the source for that example can be ound in this thread.
<a href="http://forums.ni.com/ni/board/message?board.id=170&amp;message.id=148471#M148471" target="_blank">http://forums.ni.com/ni/board/message?board.id=170&amp;message.id=148471#M148471</a> 
Message Edited by Ben on 10-29-2005  10:42 AM
x9561 (148441)
10/29/2005 4:10:48 PM
Thanks for the link, Ben,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Phillip C.'s&nbsp;post&nbsp;seems most helpful.&nbsp; He makes the distinction between object-references and control-references.&nbsp; Looks (to me) like "Make current value default"&nbsp;updates a table of default-values - which are applied sequentially to objects in the cluster (when the user selects "Reinitialize to default value" OR&nbsp;whan a type-def change is&nbsp;detected.)&nbsp; But the defaults-list isn't being updated&nbsp;[correctly]&nbsp;when a cluster-object is removed - so obsolete default-values start getting forced onto&nbsp;a new&nbsp;list of objects. &nbsp;I'd have thought that a "default value" would become a property of (stored "inside")&nbsp;the cluster-object,&nbsp;and, so,&nbsp;follow the object.
Thanks for the work-around!&nbsp; Of course if someone needs&nbsp;the constant/defaults in many places, they would&nbsp;want to&nbsp;use a sub-vi, refer to a global value, or employ some solution to&nbsp;constrain the damage caused by typedef changes.
x9561 (148441)
10/29/2005 9:10:46 PM

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