Touch Panel Shared variable binding does not work.

Hi,
Is there any reason why shared variable binding is not working under Touch Panel Target?
Is there any plan for implementing or there is some trick I should know?
Andras

RebeccaFo wrote:
Hello Andras,
which version of LabVIEW are you using? As yu can see in:
http://digital.ni.com/public.nsf/websearch/04AAA6903A9456F08625715A0026BC57?OpenDocument
it should work. So what for problems do you have?
Thanks,
Just FYI, the KnowledgeBase article linked above has been revised and moved to a new location. See the new KnowledgeBase 58JFBGD2: Are Shared Variables Available For LabVIEW Mobile Module (Formerly PDA Modul...

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****************** THE FOLLOWING DOES NOT PRODUCE THE RIGHT EFFECTS ******************
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     * WARNING: Do NOT modify this code. The content of this method is
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    @SuppressWarnings("unchecked")
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****************** THE FOLLOWING WORKS ******************
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I think I figured out the general reason for the problem based on a quick trace through of the GridBadLayout code in a simple example, and I wanted to share my findings in case they may be useful to anyone else. I felt there were some concepts gleaned from the source code that don't appear reinforced with documentation or, more importantly, in tutorials or books I checked. That's why I wanted to share my findings with this simple yet perplexing example.
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11x
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In the above simple example, JLabel1 ends up giving gridx 1 (0 being first) its full weight of 1.0. The gridx 0 column receive zero weight from JLabel1. What happens is the code in GridBagLayout sees that there are no presently assigned weights to column 0 and it simply assigns all remaining unassigned weight of JLabel1 to JLabel1's last, right-most in this case, gridx column. This means that gridx 1 gets the full 1.0.
By contrast, though, when processing JLabel2, the GridBagLayout sees the previously assigned 1.0 to gridx 1 (JLabel1's right-most grid column) and it ends up assigning all of JLabel2's weight to that same grid location, gridx 1. In this case, even though JLabel2 supposedly spans through to gridx 2, the actual gridx 2 column gets 0 weight from JLabel2 and therefore gets no width.
The result is that both JLabel1 and JLabel2 give 100% of their weight to gridx column 1 (what I called above a "weight pool" rather than a grid location), and both gridx 0 and gridx 2 receive 0 weight and I'm guessing appear without any size. What's odd about this is that even though JLabel1 starts at gridx=0, it really doesn't draw itself anywhere but starting at gridx=1. Likewise, even though JLabel2 draws itself supposedly from gridx=1 through to gridx=2, it doesn't really go into gridx=2 because gridx=2 doesn't get any width.
In fact, given the code in GridBagLayout, it doesn't matter how much weight I give to either JLabel, all 100% of the weight will end up in gridx 1, the "center" grid location. The only way to get columnar distribution is to create other components to force the GridBagLayout to see individual columns which match the "grid." When I do this, the columns allow me to create the JLabels in a fashion where they intent/stagger, where a JLabel can start at a "column" location that is in the middle of another JLabel.
Given this, I've come to the conclusion that it's not worthwhile to look at the GBL "grid" as a grid that propagates grid-like visual locations. It's more like the grid exists during the computation of weights which end up determining the true columns and rows that will visually exist, which may well not be anything like the grid locations one might visualize when looking at the constraints used.
I think it's unfortunate that many examples and tutorials don't reinforce this concept with simple examples that help one grasp this easily. Most examples I see actually can fool a user into thinking a grid is a true grid in that positions represent visual locations, or that a control spanning into a grid column means that weight will be (at least) partially distributed there.
You very often won't see the problem I'm describing above when you have dialogbox-like alignment of components which most tutorials and examples utilize. For example, if I take the same example as above, but intent JLabel so that it's gridx is 2, not 1, then both JLabels will not be sharing a single grid column so their weights won't collide. In such a case, one might be misled into thinking that a GridBagLayout's grid is truly providing row/col locations when it's not really doing that. Instead, in this latter case, one is really gaining that effect because certain unintuitive weight collisions. which would produce unexpected results, are being avoided.
I thought weightx values would give a weight equally to all gridx columns that a component spans but that doesn't seem to be the case here. In fact, it's not even a components first column in my simple example above. GBL causes JLabel1 to given all its weight to gridx=1 (and nothing to gridx=0) while GBL causes JLabel2 to give all its weight to gridx=1 (and nothing to gridx=2). In one case, JLabel1, all weight goes to its right-most spanned-to column, while with JLabel2, it goes to JLabel2's entire first gridx location.
I guess this is what makes GridBagLayout (GBL) unintuitive. But I don't think it's so much unintuitive as it is probably not well documented. When you look at the source code, it explains stuff which should be in the docs. In fact, not one single book I saw gave any help in solving this problem. I'm guessing this is largely because folks use GBL through trial and error until they get what they want, and perhaps they don't often need to indent halfway as I'm trying to do with GBL in the above example. If a lot of components are aligned, the results are not as unexpected. I'd say, though, that even in those not-so-confusing cases, GBL can troublesome without knowing its grid is all about a grid of weight pools which may or may not produce a visual grid depending on all components' constraint settings.

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For example, I want to change "p_0=p_1+p_2;" into "x0=x1+x2;". However the VI does not do it and returns just the same formula. Is this the specification? I enclosed a sample VI to show it.
Attachments:
SubTest.vi ‏44 KB

You problem is in "Find String Identifier" (a subVI of "Substitue Variables") - it searches your variables and tries to split any other characters out of it (it only accepts alphanumeric and spaces as variable names, not special characters - hence your "p_0" becomes "p", and then "p" is not found in your substitution rules, so the original is piped through instead.
Copyright © 2004-2015 Christopher G. Relf. Some Rights Reserved. This posting is licensed under a Creative Commons Attribution 2.5 License.

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