Tracking value change in Label control

Hi,
Is there any way to determine the bindable value change in a
Label control automatically and fire any function upon that?
Thanks!
ASB.

Don't know if this is what you are looking for, but it might
be useful:

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Problem updating a control on one panel based on a value change in another control on a different panel

Hi,
I am trying to update the value of a control on one panel when the value of another control on a different panel is changed. The two panels are saved in two different .uir files, so there are two associated .h files generated by CVI. The problem is that, inside the callback function for the control that is being modified (Ctrl_Id_A on Panel_A), when I call SetCtrlVal(Panel_B, Ctrl_Id_B, Value); 'Panel_B' and 'Ctrl_Id_B' (which have the same numeric values as Panel_A = 1 and Ctrl_Id_A = 2 in their respective .h files) are being interpreted as Panel_A and Ctrl_Id_A. I never understood how CVI makes this distinction, eg. knowing which of PANEL_A = 1 and PANEL_B = 1 is being referred to, but didn't worry about it since I never needed cross-communication between panels until now. Any help on how to implement this would be greatly appreciated. Thanks!
Solved!
Go to Solution.

This is a basic issue on which you can find tons of forum posts
The online help for the function recitates:
int SetCtrlVal (int panelHandle, int controlID, ...);
Parameters
Input
Name
Type
Description
panelHandle
int
Specifier for a particular panel that is currently in memory. You obtain this
handle from LoadPanel, NewPanel, or DuplicatePanel.
controlID
int
The defined constant, located in the .uir header file, that you assigned to the control in the User Interface Editor, or the ID returned by NewCtrl or DuplicateCtrl.
value
New value of the control. The data type of value must match the data type of the control.
That is, you must not use the panel constant name in the first parameter of SetCtrlVal, use the panel handle instead. The system guarantees that all panel handles are unique throughout the whole application whichever is the number of panels used in every moment.
int SetCtrlVal (int panelHandle, int controlID, ...);
Purpose
Sets the value of a control to a value you specify.
When you call SetCtrlVal on a list box or a ring control, SetCtrlVal
sets the current list item to the first item that has the value you
specify. To set the current list item through a zero-based index, use SetCtrlIndex.
When you call SetCtrlVal on a text box, SetCtrlVal appends value to the contents of the text box and scrolls the text box to display value. Use ResetTextBox to replace the contents of the text box with value.
Note This function updates the displayed value immediately. Use SetCtrlAttribute with ATTR_CTRL_VAL to set the control value without immediately updating the displayed value. For this reason, SetCtrlAttribute with ATTR_CTRL_VAL is generally faster than SetCtrlVal. However, if the control in which you are setting the value is the active control in the panel, SetCtrlAttribute with ATTR_CTRL_VAL displays the value immediately.
Note This function is not valid for graph and strip chart controls.
Parameters
Input
Name
Type
Description
panelHandle
int
Specifier for a particular panel that is currently in memory. You obtain this
handle from LoadPanel, NewPanel, or DuplicatePanel.
controlID
int
The defined constant, located in the .uir header file, that you assigned to the control in the User Interface Editor, or the ID returned by NewCtrl or DuplicateCtrl.
value
New value of the control. The data type of value must match the data type of the control.
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
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Event structure to detect value change of a control within a cluster in an array

I have 1D array that contains a cluster. The cluster contains a numeric and a boolean control.
If the user starts to edit the numeric control value i would like to call one subVI, and if the boolean control value is changed, call a different subVI.
The array control on the front panel allows the user to edit a number of the array elements.
I would like to use an event structure to detect a value change in the cluster. When editing the Events, in the Event Sources panel i get the option to select only the array, not the cluster within the array or the controls within the cluster. Can the Event structure be opened up to show controls within clusters and arrays?
The solution i am using is to detect a mouse up event on the array and then use property nodes to determine if the key focus is on the numeric, and a case structure to determine which subVI to call. This works, but is there a better (simpler) way?
Thanks, Blue.

Thanks for the responses guys.
The tricky bit was that i wanted the numeric control values to flag they were going to be edited, so i could call a subVI, before their values were changed by the user. This is done by using the key focus property node, - i need to detect changes on the fly rather than post the event. Probably didn't make this clear enough in my original post.
The array is of variable size depending on if the user decides to insert or delete elements. The user also has the option to click and edit the array without having to do to much scrolling through the array index, as the FP shows several elements at a time. The Event Structure does a good job of automatically determining which element in the array is being edited, and returning those values to the property nodes. Turned out simpler than i thought it might be at one point!
Cheers, Blue.
Message Edited by BlueTwo on 01-15-2009 06:52 AM
Attachments:
evstrct1.jpg ‏63 KB

PDA build error when using a 'value change' event on two controls

I get a build error when I use a 'value change' event on controls of a different type or even a different numeric representation. I'm using LV 7.1 PDA with no other modules installed. Attached is a picture of the entire code and the error message.
Try to take over the world!
Attachments:
PDA Error.jpg ‏48 KB

Hi,
I verified the error that you are seeing. It appears to be a bug hence I have reported it to our developers. Hopefully this bug would be fixed in the next relaese of the PDA module.
Thank you for pointing this to us. It is through feedback that we can make LabVIEW PDA module even better.
Regards,
Ankita A.
National Instruments

How to Track the changes made to the custom table field value

I want to track the changes made to the custom table field value in table maintenance generator.please help me it is very urgent
Thanks & Regards,
Kranti

Hi Satya,
These are the steps you've to do.
1. Enable the change document flag in the data element level for the fields of the tables you want to monitor.
2. Go to transaction SCDO. Create a new change object, and add your table to this object. After generation, you'll get a function module.
3. Call this function module in the table maintainence generator screen, after the data is saved to the database table. This function module automaticallly writes the changes, with the old and new values, and the fields that were changed to the tables CDHDR and CDPOS.
4. You can keep track of the changes made to the table by monitoring these tables.
Regards
Anil Madhavan

Tracking the changes made to the custom table field value

Hi all,
can we track the changes made to the custom table field values. if yes..plz specify how it can be done.
Example: if i changed the value of field 'NAME' of table 'YYHCUSTOMER'. i would like to know the old value and the new value of the field. For this, I set the flag 'LOG DATA CHANGES' in the technical settings of the table 'YYHCUSTOMER'.

-> try TA: SCU3
regards Andreas

How to change the value from one input control to another input control?

Hi Experts,
I want to change the value from one input control to another input control. For Example if i change month in first tab. it should reflect in second tab also. How should we acheive through input control or some other option.
Here I attached screen shot.Please help me for this

Hi,
It is not possible to have Input controll in all tabs that will be set from another .
But There is one workaround .
Follow the link below .
http://davidlai101.com/blog/2013/08/13/web-intelligence-input-control-that-affects-all-tabs/

How can I make a global change so all controls and indicators labels on the front panel change to another colour?

How can I make a global change so all controls and indicators labels on the front panel change to another colour?
I need to change the front panel so that it can be used in a dark environment.

Hi
The only way I see, is to use the "Controls[]" property and iterate through all of them. But don't forget about nested elements (i.e. clusters, tab-controls, ...).
Thomas
Using LV8.0
Don't be afraid to rate a good answer...

Tracking changes to LPK2 (Control Cycle)transaction

Hi,
We would like to track the changes made to the existing control cycle data.
The changes to the control cycle are performed through LPK2 transaction.
The transaction takes material, plant and supply area as inputs.
We would like to know for particular material, plant and supply area who,when and what data has been changed.
I appreciate your quick help in this regard.
Thanks in advance..

Transfer requirement
 LTBK Transfer requirement - header
 LTBP Transfer requirement - item
Transfer order
 LTAK Transfer order - header
 LTAP Transfer order - item
Master data - stock positions
 LQUA Quants
Inventory documents in WM
 LINK Inventory document header
 LINP Inventory document item
 LINV Inventory data per quant
These are the tables which are affected when you make the modifications.
Hope this helps you
Regards,
Pavan

Intensive slider control use may lead to LabVIEW hang and system instability when coupled to event loop "Value Change"

Occasionally, over the past year or two, I have noticed on different machines and versions of LabVIEW (8.0 and 8.5) that intensive operation of the LabVIEW slider control (holding down the left mouse button and shaking the mouse quickly back and forth to move the slider for several seconds) may cause LabVIEW to hang with high CPU usage (50% on my current test machine, which has a Pentium IV "hyperthreaded" processor, so 50% is the max that a single thread can take up). In some instances, after the LabVIEW process is forced to quit, the system itself becomes unstable (more high CPU usage) or hangs, up to and including the need for a hard restart. I have seen this behavior both when handling slider change events the "old fashioned" way with a while loop and a case structure; and also when using a while loop with an event structure handling the "Value Change" event for the slider.
Attached is an .rtf file dump of the front panel and block diagram of a simple test VI that replicates this problem in my hands (using an event structure). The loop count runs to at least several hundred iterations before the crash occurs.
At least for the "old fashioned" loop handling method, adding a forced wait of a few dozen msec per loop didn't seem to be a workaround. I haven't tried this idea with the event structure, but don't expect joy to follow. The possibility of a system hang discourages aggressive experimentation.
Is this a known issue? Can anyone else replicate it (carefully)? In any case, I'd welcome other suggestions for workarounds.
Thanks,
Darin Nelson
Attachments:
Hang Slider.rtf ‏683 KB

Thanks for all your responses, and especially to those who are waggling their mice around trying to reproduce this. I'll respond to (most aspects of) the last several posts in one message.
LabViewGuruWannabe:
I'll see if I can get the original code to post in a separate message, I posted the .rtf originally because I thought there might be filtering on forum posts (I'm sort of new here). But I doubt you re-created it wrong.
The "more modern" test hardware was an Intel Core2 , 2.4 GHz, 2Gb RAM, on an Intel 965 family motherboard. As I said, it took me two tries to trigger the error on this hardware; in the case where it triggered, I was at almost 12000 iterations before things went south. 10000 iterations, therefore, might not be enough--or you might never get it, for all I know. My Pentium 4 Hyperthreaded machine (3.2 GHz, 2 Gb RAM) triggers the hang much more easily (always within 2500 iterations, usually within 1000), so there seems to be some hardware dependence here. Maybe the workaround is just to use hardware recent enough that no one not under the influence of strange compulsions will accidentally trigger the hang.
TonP:
After reading your suggestion, I tried something even more radical -- getting rid of the handling code altogether. I took the slider node out of the while loop, and removed all code inside the "Slide" case of the event structure.
On my Pentium 4 machine, the hang triggered after 677 iterations.
Brian Beal:

Huh, I never even noticed that checkbox existed. Anyway, yes, I
kept the default to lock out the front panel while the event process. If I
disable it… I still get the hang.
Message Edited by dman on 02-04-2008 06:36 AM

Tracking the change of value/ New insert within a table

Hi!
Can you please suggest any way to track the change/s we are making in the Table. I tried the following:
1. Activated the Log option for the table in Technical Setting
2. Through SCU3 we are able to see the changes that has occurred in the table.
3. I checked the option of tracking of change for a data element in further characteristic of the data element, say for matnr this is active.
Now problem lies:
1. The output available shows only the key field/s of the created/deleted record.
2. No track for the changes of any non-key field(:>(
Objective is to track any change in any field of any record of the table.
Please can you suggest on this.
Best wishes,
Atanu

Hi Atanu,
Change Documents might be what you are looking for. SAP uses these to track changes in all important documents (Material Master, PO, SO..), and these changes can be viewed using CDHDR and CDPOS. For more information on how to enable the same, pls see the following link:
http://help.sap.com/saphelp_47x200/helpdata/en/2a/fa0b1a493111d182b70000e829fbfe/frameset.htm
Sudha

Tracking Table value changes

Hi all,
currently we are in the process of tracking the data changes in the following table
/sapsll/adrcon (GTS specific) but it has been checked for the log data changes in its technical settings
but still we are unable to track the changes in
cdpos table
please provide your valuable inputs
so that we can track the changes
cheers
balu

Hi,
The place where we find Transaction Table history is SCU3.
===================================================================================================
The logging flag defines whether changes to the data records of a table should be logged. If logging is activated, every change (with UPDATE, DELETE) to an existing data record by a user or an application program is recorded in a log table in the database.
Note: Activating logging slows down accesses that change the table. First of all, a record must be written in the log table for each change. Secondly, many users access this log table in parallel. This could cause lock situations even though the users are working with different application tables.
Dependencies
Logging only takes place if parameter rec/client in the system profile is set correctly. Setting the flag on its own does not cause the table changes to be logged.
The existing logs can be displayed with Transaction Table history (SCU3).
Regards,
Bhargava

Using an event structure to reset a boolean control with ring menu value change

I am trying to get two boolean buttons to reset when the value of a ring menu changes. For this I am using an event structure set to execute with a ring value change. However I have other code that needs to be executing while the event structure waits for the value change. I place my event structure inside the while loop the buttons reset as expected but my other code does not run (except at the moment of value change). If I place it outside the loop the rest of the code functions as expected but the buttons do not reset. Any help you can offer is much appreciated.
Solved!
Go to Solution.
Attachments:
event structure reset.vi ‏11 KB

try this
Attachments:
event structure reset_edit.vi ‏14 KB

How to change property of control inside a cluster?

Hello,
1)
I have cluster with dozen controls (booleans and slides).
I want to change the slides control scale property in runtime.
Im doing UnbundleByName to the cluster to pick the right slide, but how i continue from here? how i access to that slide property?
2)
The main problem is that i have vi with lot of controls, and i want to find a way to save the control values to file, so i decide to insert all those controls to cluster, and to use datalog...Is there any other elegant way?
Tnx,
HaD
Message Edited by HaD on 08-06-2007 03:43 AM

Hi HaD,
controls usually have properties for Caption and Label. You can check one or both for the name of your control...
The array of control references should contain the references in the tabbing order, but it's always a good idea to cross-check that you use thoe correct reference
Message Edited by GerdW on 08-06-2007 11:21 AM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Display the Current Running Files in the Label Control

I have a label control in Windows Form Application, and i have the application to display the building and progress of the projects in the label control using C# code. Along with the update of the label, the progress bar should also show progress simultaneously,
according to the building of the project. How should i do this ??
Thanks.
Tanmay

Hello All;
I want to know how can i display the current running project in the label control along side the same, i want to display the progress of the files that are build successfully through a progress bar.
What i need to do is when i click the button named as "Build" in the GUI it will display the selected projects to build from the CheckedListbox into the label control placed in the GUI.
Please, provide me some hint regarding the same.
Thanks.
Tanmay
Hello,
It depends on what your application is and how you build these files, if possible you could share them with us.
The most common way to display the progress, is to set the text for that label before or after we execute the line building these files.
You could place the lines setting the text or change the progressbar.value before or after the building lines.
Here is a simple sample using progressbar with a backgroundworker.
http://stackoverflow.com/questions/12126889/how-to-use-winforms-progress-bar
Regards,
Carl
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Tracking value change in Label control

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