Multiple palette files in a library/class file causes problems

While developing a labview class, I wanted to set the default palette, so I added the relevant dir.mnu file to the class. Unfortunately, the class already had a dir.mnu file in it. On adding the file, I got some error message about a dependency change*(which makes no sesne, how can a palette file have any dependencies !). On saving the class and then attempting to reopen it, LabVIEW claims it is corrupt. Inspecting the xml .lvclass files reveals that when I added the new paletee file, LabVIEW actually just added a second reference to the palette file already in the project, which it then considers to be a problem when it tries loading the class. This is clearly a bug on a number of levels:
It should not be possible for the user to induce LabVIEW to create corrupt xml files through such simple attempts to use documented features.
The underlying problem is that LabVIEW appears to be using the conventional search/linking rules to load library items irrespective of whether they are a vi (which should ahve a unique name) or other file (which might well be legitimately non-unique).
Given the near impossibility of renaming a palette file without breaking palette links this particular bug is extra annoying.
Gavin Burnell
Condensed Matter Physics Group, University of Leeds, UK
http://www.stoner.leeds.ac.uk/
Solved!
Go to Solution.

Sorry for the delay, it took me a little longer to reproduce the problem systematically. Attached are three zip files of the same trivial class. The only difference between them is the contents of the class file itself.
The key point is that I have two folders in my class - Public and Protected (although I haven't actually set the access scope I realise). Each folder has a dir.mnu file in it and there is also a dir.mnu file in the main class folder. The class virtual folder structure maps directly to the on disc version.
In the first zip file the dir.mnu files are not added to the class.
In the second zip dile I added the dir.mnu by right clicking and doing Add file... This is allowed because each dir.mnu has a distinct path. I then save the class file and close it.
To get the third zip file, I reopen the class file. I get a single dependency warning about dir.mnu in one of the sub folders. So I think "fine ok, somethign funny about that dir.mnu file" - note if I'm loading a whole heirarchy of classes I may be told LabVIEW is laoding the dir.mnu file from somewhere completely different in my class structure. I then save the class file to give the thrid zip file.
The lvclass file in the third zip file is corrupt because it has multiple entries for the same file, because it didn't handle having more than 2 items conflicting.
The correct behaviour would be not to invoke the conflicting item names for non vi/ctl document types. I could imagine that there would be similar problems if I had a say a whole range of say README.html files strewn over the place.
Gavin Burnell
Condensed Matter Physics Group, University of Leeds, UK
http://www.stoner.leeds.ac.uk/
Attachments:
Break Class File-1.zip ‏21 KB
Break Class File-2.zip ‏21 KB
Break Class File-3.zip ‏21 KB

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