Positioning string indicator scrollbar using a control reference?

How can I control the position of the scrollbar of a string indicator from within a subVI?

Pass a ref of the indicator to the sub-VI and then use property node where you have selected;
Text.ScrollPosition
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Similar Messages

Can you use a control reference for a graph with two channels of data?

when i try to wire a 2-D array of data to the value property of a graph(strict control reference), it shows a conflict. The value data type only shows up as accepting a 1-D array input. I want to use control references to pass the chart data to my main vi. Will I have to change the waveform graph control reference into an array control reference to make this work?? This would require adding a while loop in the main vi to read the array data and update the graph data??

> when i try to wire a 2-D array of data to the value property of a
> graph(strict control reference), it shows a conflict. The value data
> type only shows up as accepting a 1-D array input. I want to use
> control references to pass the chart data to my main vi. Will I have
> to change the waveform graph control reference into an array control
> reference to make this work?? This would require adding a while loop
> in the main vi to read the array data and update the graph data??
I think the problem is that your waveform graph is set to take one type,
a 1D array of doubles, and you are wiring a different type. While
charts adapt to type when the data is wired to their terminal, they do
not adapt to data wired to their value property. If you change the
datatype of the graph from its terminal, then you should see the value
property change type also and you are set.
Greg McKaskle

Using control reference with a Sub-vi over a TCP VI Server connection

I tried to use a Call by Reference Node to run a sub-vi on a remote PC through a TCP VI Server. An output of the sub-vi is connected to an indicator in the main vi using a control reference.
The sub-vi started on the remote PC, but the information from the sub-vi was not passed to the control reference in the main vi. However, if I change the client name to the host PC, ie. running the server and client vi on the same machine, the code works as planned. I wonder if control reference is not suppose to work over a TCP VI Server connection?
Any suggestion would be very much appreciated.
Regards,
Calvin Tsang
Attachments:
main_vi.vi ‏29 KB
sub_vi.vi ‏20 KB

Thank Jean-Pierre for pointing out that Refnums are local to an application and so control reference doesn't work between different applications on separate machines.
In addition to the method shown in Jean-Pierre's example vi, I found that the use of "invoke method: GET control value" and "invoke method: SET control value" can produce similar results. See the attached files for an example. In this example, the indicator on the local vi is used to monitor the progress of the remote vi and the local control is used to stop the remote vi. So the data synchronisation between the two vi is not important here.
However, you may notice the indicator "current counter" in main1_vi.vi doesn't properly interpret the binary string from "invoke method: GET control
value", can someone shed some light on this, please?
Calv
Attachments:
main1_vi.vi ‏48 KB
sub1_vi.vi ‏13 KB

How can I export formatted text from a string indicator?

Does someone know how I can export formatted text (i.e., parts of the text have different formatting, such as color, fontsize, etc.) from a string indicator? Using copy/paste does not work, as it only exports unformatted plain text.

Hello Sparti,
Thank you for your suggestions, they are all very useful, and I plan to use the HTML feature under Report Generation to export the formatted text from Labview. However, I am still not sure how I can extract the formatted text from a *string indicator* and transfer it to one of those VIs, so that it can be exported to other applications. Let me give some more specific info on what I am trying to achieve: I am monitoring the communication between two pieces of equipment. A string indicator shows all the data flow, with different colors for data coming from different instruments. I managed to do that by using a property node and playing with the selection and font color properties. Now, if you just wire the output of the string indicator, the formatting is gone and all you get is just plain black text (for instance, try to programmatically transfer the formatted text from one string indicator to a different string indicator and you will see that the formatting is not preserved). Even if you try the "brute force" method of manually selecting and copying the text in the indicator and pasting it to Word, LV does not export the formatting. But, if you paste *within* LV (for example, paste it to a string constant in your diagram), then it works. To extract the formatted string from the indicator, I also tried to use a property node, but without success. I am trying to avoid duplicating part of my code to generate the same color-coding scheme on a report. It would be way easier to be able to transfer the formatted text from the string indicator. This is particularly annoying, because the information is there, stored in the data structure associated with the string indicator. But how can I put my hands on it? Any ideas?

Difference control refnum and control reference

Hi guys.
I am new on labview reference, can you explain difference between control refnum and control reference.
Gary Wang

Are you sure you don't mean "refnum control"? That is a front panel control that can be selected as a reference to any one of several data types such as application, VI (including strictly typed), control or indicator. Whereas the "control reference" is a block diagram object that points to a specific control on your front panel (it can also be "linked" to other objects so it is similar to a "refnum control" in that respect).
“A child of five could understand this. Send someone to fetch a child of five.”
― Groucho Marx

Advanced ?? Control Reference Update - Too slow.

I have a main VI which controls a bunch of SubVIs. Each of these subVIs
get data from the DAq and generate the plots and intensity graphs. I
use a control reference to display these plots and graphs on my main
VI. This is really slow. When I compare the speed at which the main VI
is updated and the subVI is updated, there is a significant difference.
Is this usually the case or am i missing something ?
Thx
Kudos always welcome for helpful posts

I agree with tst, your PP VI runs at unlimited speed for no good reason. You should pace it with a small delay so it will release the control to other processes after each iteration.
Also your DAQ part seems inefficient. Why do you configure the DAQ task from scratch, acquire, and close at every iteration? This is way too much work. You should flatten this out to the PP vi. Configure outside the loop on the left and close outside the loop on the right. Place only the ACQ part inside the loop.
Also, place the real terminal of the graph inside the loop and clear it once at the beginning using a local variable. A local variable is always more expensive and less efficient.
I don't understand why you need a timeout event in the main VI, it does not do anything except spin the loop, right? Just delete the timeout event.
LabVIEW Champion . Do more with less code and in less time .

How do get an indicator to appear when using control references

Hi, can anyone help with the following?
I've just managed to resolve the problem of getting indicators of a sub VI to appear on the front panel of my main VI and remain active. This was done by using control references. Basically, I created a reference for the control on the front panel of the main VI. I then dragged the reference in the block diagram of the main VI to the front panel of the subVI to obtain a Control Refnum. Then in the block diagram of the subVI I created a property node and linked the indicator and control refnum to it. Then I wired the subVI's connector pane to the control refnums in the subVi front panel. Finally, I copied the subVI icon into the mainVI block diagram
and wired the references to the relevent renum terminals of the subVI connector pane. However, I'm still having a problem with one of the indicators, which I've called 'time limit reached?'. When the VI has reached the end of the run this indicator in the subVI changes from the word 'No' (surrounded by a red box) to 'Yes' (surrounded by a green box). In the sub VI this was done by using a comparison function and linking the visible property node to the 'time limit reached?' true/false boolean. I would like the same to happen on the front panel of my main VI. In this case where should I put my property node and control refnum? I'm unable to link a control refnum to the current visible property node. When I create a visible property node which can be joined to a control refnum then I don't have the option to link it to the true/false boolean. Any suggestions? I have written a small VI which demonstrates the problem if need be.
Thanks, Adrian
[email protected]

I would suggest to use a customized boolean instead of making it visible/invisible, just take a boolean, change boolean text from TRUE/FALSE to YES/NO and change also diferent cases colors, this way, you don't need to play with property nodes. If this can't be done for any reason, using a local / global variable is the only solution that comes to my mind.
Hope this helps

I would like to do a program that have one string control and one string indicator, any character that I type in the string control in the same time it will be appear in another string (indicator). How can help me?

I would like to do a program that have one string control and one string indicator, any character that I type in the string control in the same time it will be appear in another string (indicator). How can help me?

Why not use an event
Add a While Loop, inside the loop add the Event Sructure.
Now in the event structure selecd the String Controls.value change event to
react
and the new value inside the event that you get,( connect to the String
indicator box.
On Sun, 10 Aug 2003 15:58:47 -0500 (CDT), WiltonFilho wrote:
> I would like to do a program that have one string control and one
> string indicator, any character that I type in the string control in
> the same time it will be appear in another string (indicator). How can
> help me?
>
> I would like to do a program that have one string control and one
> string indicator, any character that I type in the string control in
> the same time it will be appear in another string (indicator). How can
> help me?
>
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

Using a control as both an indicator and control

Hello,
I have been search and reading for a few hours now and have finally decided to post. I fear I am not using the correct terms because I am fairly new at LabView.
I currently trying to build a user interface that uses 9 different tabs [I am using the same tab structure as in the labview example code]. There is a set of variables that will need to be on 3 of these tabs in similar form. These variables include:
2 boolean controls
1 boolean indicator
1 string indicator
12 numeric indicators
I would like to have all of these values be the same on the separate tabs at the same time.
For example if I press one of the boolean controls, that same boolean control should now be activated on the other tabs as well.
If it would be possible, please do point me in the right direction of how to go about doing this. (Also the proper terminology)
Many Thanks,
Buffalo960

tbob wrote:
I don't think you can have the same instance of controls and indicators on separate tabs. Two options:
1. Create separate controls on each tab. Put code such that if any control or indicator in the list is changed on any tab, the other similar ones get changed programatically. You can do this with an event structure and local variables or property nodes. Lots of programming.
I don't think that it will be a lot of programming. For example: if he has 5 controls and want to keep all of them synchronized, with only one Case of the Event Structure he can do the job, setting the 5 controls to trigger that Case when "Value Change" and use the Event Node "NewVal" to write the same value for all controls (including the control that triggered the event, but with a code this size it will not be a big deal to write the information a again to the same control).
Thanks
Dan07
Attachments:
Multiple Controls.vi ‏39 KB

Performance issues using control references in Analog control loop?

My main vi of a tensile tester control application calls a number of sub-vi's, including a analog control loop which controls the test. The control loop must update some boolean and digital indicators and respond to user input on the front panel of the main vi during a test.
To simplify my main vi, I moved the control loop code into a sub-vi, and used control references to access the controls and indicators on the front panel. However, this has dramatically affected my loop performance, and the loop can no longer keep up with the acquisition speed.
Do control references always cause such a slowdown? Is there anything that I can do besides moving the code back into the main vi?
Thank You,
David Creech

I have had the same problem. I have discovered other funny things about references also; some kind of memory management (or mismamagement?) is taking place behind the scenes.
Regardless, you can often do away with the references by passing the initial state of a control or indicator into the subvi, changing it inside, and passing the altered state back to the caller. Once back in the caller you update the front panel control or indicator by using a local variable.
One thing to watch out for if using this scenario is the dreaded race condition; this can be avoided using a state machine. Check out
http://www.advmeas.com/goodies/statemachine.html
for a good example. It is a shame that references behave in this way; it limits thier usefulness.
Perhaps someo
ne else will point out a way to utilize them more sucessfully?

Using "Set Control Value" to pass a reference

Hi,
every time I tried to passe a Control Reference using "Set Control Value" I have the Error 1 (invalid input parameter at invoke node). Why is it not possible to pass a control reference using the invoke node??
Thanks
Golzio

Hi,
This is possible. Trick is, the type of the control reference needs to be
the same as the input. E.g. a string control reference is a different type
as a numeric control reference (, or a control reference).
To avoid this conflic, make sure the input of the vi is a control reference
(and not a e.g. string control reference). Also make sure the to convert the
reference you pass to a control reference (using Application Control>To More
Generic Class).
Regards,
Wiebe.
"Golzio" wrote in message
news:506500000008000000C1F00000-1079395200000@exchange.ni.com...
> Hi,
> every time I tried to passe a Control Reference using "Set Control
> Value" I have the Error 1 (invalid input parameter at invoke node).
> Why is it not possible to pass a control re
ference using the invoke
> node??
>
> Thanks
> Golzio

Listbox as string indicator and control

Hi,
Me and my group at school for a project are trying to find a sloution to the following problem:
what we want to do is be able to send strings to a display like a sting indicator but also be able to change the color of the strings on the fly and not change the entire display. Also we want the display to act like a control so that when one string is selected one can press a button to get more information on the selected string.
We have tried using sting controls but we can not select individual stings and can not change just one line's color (they all change)
A listbox would be perfect but we can not figure out how send strings to it to be displayed.
Or is there an other way to do this??
Any help would be greatly appriciated.
Thanks!

I know about the property node for Itemname, but will we be able to send a string to it so it can be displayed in realtime?
The project is a client server architecture in which the client sends commands via TCP/IP to a remot PC to diagnose the connected devices and send back to the client in the form of strings the status of the devices to be displayed. The status(s) can be selected and then another button is pressed to give further information on the selected device.
So, I guess what we are asking is whether the server can send to the client strings to the list box to be displayed for the currently connected devices such as: mouse, network card, video card, keyboard, and so on.... (the dll to do the devices dtection is working and integrated into labview.)
Thanks,
SUNY Binghamton University Senior Project group 33

I want to take a series of hex characters in a string control and produce an HDLC string indicator for example if the data string control is 3F27 then the HDLC string indicator is 7E003F2700B57E

I want to take a series of hex characters in a string control and produce an HDLC string indicator for example if the data string control is 3F27 then the HDLC string indicator is 7E003F2700B57E

"thanks for your help "
Does that mean you figured it out already?
If not, see this thread for some HDLC related code.
http://forums.ni.com/ni/board/message?board.id=170&message.id=146859&query.id=3388#M146859
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Using same string indicator in different stacked sequences

Hi guys, I want to use the same string indicator in different stacked sequences. I tried to wire the output of every string constant through the sequence to my string indicator outside the sequence block but then I get an 'Wire connected to an undirected tunnel' error. What is the best way to use the same indicator for all the sequences?
Solved!
Go to Solution.

GerdW wrote:
GerdW wrote:
@TiTou:
Problems with copy&paste?
not even :-o
GerdW wrote:
@TiTou:
Problems with copy&paste?
not even :-o
see : http://forums.ni.com/t5/Feedback-on-NI-Discussion-Forums/Text-lines-and-images-get-duplicated-when-I...
When my feet touch the ground each morning the devil thinks "bloody hell... He's up again!"

Text output using string indicator from subVI to mainVI

Hi,
I think I asked similar question before, but since then my program got more complicated.
Here is my issue.
I have a program with nested loops to print out the stream of strings in subVI
and it needs to be updated in a string indicator in mainVI.
When I say "update", it needs to be updated as it comes out line by line, not by
the block when the loop is finished.
I was not successful doing this by both shift register or RefNum.
Maybe I do not know the advance usage these two.
So can someone show me how?
I have attached simplified version of my labview program.
Thank you in advance!!!
Solved!
Go to Solution.
Attachments:
MainSubStrIndicator.zip ‏12 KB

Hi horanyee,
use some standard shift registers to achieve your goal... They will keep the previous valu so you can ad the new line!
Message Edited by GerdW on 09-11-2009 08:43 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome
Attachments:
subVI.vi ‏8 KB

Positioning string indicator scrollbar using a control reference?

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