Strange behaviour with Vision 8.2 and Shared Variable 1D Image Array

I've just upgraded to LabVIEW 8.2 and Vision 8.2. When loading a particular VI, it is searching numerous times for ...\LabVIEW 8.2\resource\objmgr\IMAQ Image.ctl - which of course doesn't exist. As best as I can track it down, this seems to be cause by a Shared Variable I have in the project which is a custom control of a 1D array of Image.
So I've created a new project from scratch to illustrate (attached). The VI runs OK, but any editing means that this non-existant control is searched for again. Of interest is also that there is a coercion dot where the Image is used, but the data type on the wire seems OK. Creating a control (rather than a Shared Variable) works fine.
Anyone know what's going on here?
Message Edited by GregS on 02-26-2007 03:43 PM
Attachments:
1DImage.png ‏4 KB
1DImageShared.zip ‏15 KB

Hello Greg,
I downloaded your project and opened it up on my
system. I received the same results as you
did – I tried to open the project it searched for \LabVIEW 8.2\resource\objmgr\IMAQ Image.ctl. I also used the 1d Image.ctl file as a constant on my block diagram and it did not
show the coercion dot as you mentioned.
There does seem to be some strange behavior going on here
with the coercion dot and the shared variable.
I will have to look further into it and report this to R&D.
But for now, we need to address your application. What is the goal of your application? How does using a shared variable with IMAQ
Images help you get there? You may be
aware of this already, but when an Image wire is passed around LabVIEW, it is
not actually passing a copy of the data in a dataflow manner. The large size of IMAQ Images necessitates
that LabVIEW pass around a pointer to the IMAQ Image. Therefore, when an array of Image controls is
made and used as a shared variable, the controls do not contain the actual
image data. Instead, they contain
pointers to the IMAQ Images. When they
are passed into a shared variable, unexpected results may occur. If the shared variable is network published,
for example, another computer on the network would receive a pointer to an
image that it would not be able to find or access.
There may be a much better way than shared variables to
achieve the same functionality you are currently looking for. If you do in fact require shared variables,
you could use IMAQ ImageToArray.vi
to create an array that can be used in the shared variable like any other data
type, and then use IMAQ ArrayToImage.vi
on the other end to be able to view the array as an image.
Please post back with more information about your
application and we should be able to find the best solution for you.
Regards,
Luke H

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