Error 1055 on Graph cursors.

I am using LabView 2010, expanding on one of the example vis for data acquisition. I want to use graph cursors to allow someone to zoom in on a particular part of a graph. To do so, I have been trying to use property nodes. When a graph has more than one cursor, the property nodes seem to access only the highest indexed cursor. So, I tried to apply a property node to a graph with just one cursor. In particular, I tried to access the x-value of the cursor. When I then run the vi, I get error 1055 "Object reference is invalid". I had hoped to construct the property nodes for one cursor, then add another cursor, and attach property nodes to it. There does not seem to be a way to use property nodes to specify which cursor I am accessing. I have tried a property node with two properties: select cursor as an input, and x-value as an output. The "select cursor" property input seem to have no effect at all.
Is there an example vi for programmatically extracting information from graph cursors?
Joe Rudmin
Solved!
Go to Solution.

Joe,
Please take a look at my screen shot as a reference for getting the x position for a cursor on a graph object. I hope this helps.
Right clicking on the graph and hover over create then property node, cursor, cursor position then cursor x. This should create a property node that gives the position of the cursor on the graph. I understand you are trying to use multiple cursors but this will get you started.
Kyle Hartley
RIO Product Support Engineer
National Instruments
Attachments:
cursor position.JPG ‏42 KB

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XY Graph cursor Error

Hello
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Just run it and while moving yellow cursor (press+hold+move), after 1-2 seconds of holding something happens.
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Cursor Test.vi ‏84 KB

Hello Karik.
I experience the exact same problem in the application I'm programming.
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Solved!
Go to Solution.
Attachments:
err vi.png ‏71 KB

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Visit the Request Support page at ni.com/ask to learn more about resolving this problem. Use the following information as a reference:
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Hi Karla,
Sorry if that wasn't as obvious as I thought! :-) Hopefully the attached image makes it clear. On the front panel, 'Cursor Channel' is inputted. This is directly wired to Histogram.Cursor.PosX. Immediately following, Histogram.Cursor.PosX is read and wired to the front panel indicator 'Cursor.Cursor Position:Cursor X'. There is always a difference of 15 or 16 between the two values. If there was no bug, these two values should be identical! I can only conclude that Labview is doing something funny...
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Message Edited by fjharris on 01-25-2008 11:34 AM
Message Edited by fjharris on 01-25-2008 11:36 AM
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XY Graph Cursor Problem in Labview 7.1.1?

Hallo,
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XY Graph Cursor Problem.vi ‏101 KB

It's a curious effect. Probably the floating point coordinate is sensitive to the exact pixel alignment (I mean that this would not happen if we had for example 1 pixel per point in the X direction).
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Jeanius,
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Application builder error 1055

ed. cross-post: http://lavag.org/topic/18047-application-builder-error-1055/
Hello everyone
I have a big problem with building applications lately. The build is running fine until the end, when it throws:
Error 1055 occurred at Property Node in VISL_findDependentVISvr.vi->VISL_findAndProcessVISvrList.vi->VISL_detectAndCopyVISvr.vi->AB_Engine_Copy_CustomIOServer_Files.vi->AB_EXE.lvclass:Copy_Files.vi->AB_Build.lvclass:Build.vi->AB_Application.lvclass:Build.vi->AB_EXE.lvclass:Build.vi->AB_Engine_Build.vi->AB_Build_Invoke.vi->AB_Build_Invoke.vi.ProxyCaller
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Lennard, Valko
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The project is pretty big (~1500 VIs) and highly object-oriented (~300 classes). It has RT (PXI) and PC part. Some of the classes are shared between PC and RT. The problem with build was present only on PC - build for RT was ok.
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Qucik Graph Cursor Legend Questions

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I have a couple of quick questions regarding my graph cursor legend:
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Hi please check Using Cursor Legend in this link if it is helpful
http://zone.ni.com/reference/en-XX/help/371361J-01/lvconcepts/customizing_graphs_and_charts/
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uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13

Error 1055 on Graph cursors.

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