How do I load a vi of global variables whenever LabView opens?

I want to be able to load a VI with Global Variables whenever I open Labview, and not have it open dynamically. So in short, how do I bind or attach a VI to open every time LabView opens and starts up.

Look at this KnowledgeBase article:
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/44e99cc41aa39f538625694b005679c0?OpenDocument

Similar Messages

How to get the value of the global variable of test stand in labview User interface?

Hi.
Can anyone Please share examples and tell me to how access the test stand global variable using labview user interface.
Solved!
Go to Solution.

I'm not surprised that what you are doing doesn't work. The Start Execution UI Message is triggered when the user clicks a button to start an execution. Realize that most executions go through a process model. So you could be looking at the sequence context of the process model and not your client sequence file.
I recommend reading that link I posted above. UI Messages are your best bet but you cannot just piggy back on an existing UI Message like this. They may not be getting sent at the time you need them to be. The only way to ensure you get what you want is to trigger one yourself at the right time.
Regards,
jigg
CTA, CLA
teststandhelp.com
~Will work for kudos and/or BBQ~

How do i create and pass a global variable from one vi to several sub-vi's?

Hi Guys,
I am trying to create a program that opens several front panels (sub-VI's) in sequence. in each front panel, the user would open a file that the name is obtained from the previous sub-VI. I would like to know how i could pass the filename and refnum of the file thorough from one sub-vi to another. A global variable would do it in VB, but how do we do global vars in LABWIEW. thanks
Papish

I put together a sample VI and Sub VI that illustrates how to pass a Refnum and access a data file while in a Sub VI.
For multiple VIs just repeat the sub VI process.
You probably don't wanna use a Global Variable if not needed (can add to the mess down the road haha).
Let me know if it helps you out! Or if I can clarify anything else!
Chances are if you have seen VI in the forest it hasn't fallen.
Attachments:
Passing Refnum.zip ‏21 KB

How can i notice the name of global variable ?

When the customizing.fmx calls the standard.fmx, I came accross an error "FRM-41067 Can not find menu Item".
customizing.fmx --> call --> standard.fmx
So, I want to assign a global variable to standard.fmx in the customizing.fmx.
How can i find out the name of global variable ???
Can I catch the name of global variable??
For expamle..
:global.menu_id was not the answer.
:global.mn_id was not the answer.
:global.mnid was not the answer.
HOW!!!!!!!!!!!!!!!!!!!!
Please HELP ME!!!

Hi
Can I catch the name of global variable?? yes u can , if u use a message after each type like...
:global.menu_id
MESSAGE (' global.menu_id = ' || global.menu_id );
SYNCHRONIZE; Hope this helps...
Regards,
Abdetu...

How do I store VI References in global variables and access them later

From what I know, Labview automatically deletes VI references when they go out of use. Is there a way for me to override this so that I can access a set of preloaded references in a separate VI? Essentially I would like to open the VI's dynamically into the memory, store the references in global variables and access them at a later time. The VI's I'm referencing won't be known until runtime. I know its not the safest way to do it, but it would be the most productive on my end.
Thank you
Clay Upton

I'm not sure what you mean by "a later time", but a VI reference will remain valid as long as the VI is in memory. If you don't unload the VIs, the references will remain valid.
If you do need to unload the VIs, for whatever reason, I would suggest the following:
Create a functional global as your interface for obtaining the references.
Feed the paths to the VIs into the VI when initializing it (since you don't know which VIs in advance).
When calling the VI to obtain the references, have the VI check them first (using the Not a Number... primitive). If it sees that they're invalid, it can open a new reference and return that.
You should note that when a VI is removed from memory, the data space is used is released, so if those VIs are expected to hold data (using shift registers, etc.) this will be a problem.
The description I've given will only be usable in certain instances (and it has its intricacies), but you didn't really give any details about what you're actually trying to accomplish.
Try to take over the world!

Example on how to set an array as a Global Variable (LV2?).

Hi,
I am new to Labview and recently I have been given the task to evaluate labview as our new data acquisition software.
Let me briefly describe what we currently have set-up and what I need to accomplish.
We have developed several dll's (created in C) to access the shared memory where the data is located and I have imported these dll's in labview and read them in as one big 1-d array. (There are several 1-d array's that I import but I will try to keep things simple by starting out with one)
Now I want to share this array to several sub-vi�s, which will I am planning to call from the run-time menu. How can I assign this array globally so that I can access it from any sub-vi?
For example, lets say
that my array name that I imported is called ARRAY1 (name created using the local variable option). ARRAY1 is a 1-d array with 10000 elements.
I would like to access only a few elements of this array on another sub-vi by its name and index number i.e. ARRAY1[10], ARRAY1[20].
Please let me know if you need any more information.
I would really appreciate it if someone can help me out.
Thanks
Nish
My E-mail: [email protected]

Attached is the VIs in LV 6i format...The advantage of those VIs is that they allow you to read and write subsets of the array, not just one element at a time.
MTO
Attachments:
Example.vi ‏27 KB
ArrayGlobal.vi ‏27 KB

How to build labview global variable into dll?And how to use it in vc++ program?

Hi!
   I want to build labview application into dll and use vc++ to call it.The labview program is a little complex,for it has many interface to vc++ and has while loop in it.When I use vc++ to call it,I must use vc++ to do other things.That is to say,vc++ creates a new thread to provide for the labview dll to run.the vc main thread goes on to other things.But the vc++ main thread must communicate with the labview dll by setting its inputs' parameters and get the results of running labview dll.Can you advise me how to realize it?
   I think global variable of labview could be useful when realizing the communication betweeb vc thread and labview dll.So I want to ask whether the labview global variable could also be built into dll and use it.Could you please tell me how to realize my idea?
   Thank you!

[email protected] wrote:
Hi!
I want to build labview application into dll and use vc++ to call
it.The labview program is a little complex,for it has many interface to
vc++ and has while loop in it.When I use vc++ to call it,I must use
vc++ to do other things.That is to say,vc++ creates a new thread to
provide for the labview dll to run.the vc main thread goes on to other
things.But the vc++ main thread must communicate with the labview dll
by setting its inputs' parameters and get the results of running
labview dll.Can you advise me how to realize it?
   I
think global variable of labview could be useful when realizing the
communication betweeb vc thread and labview dll.So I want to ask
whether the labview global variable could also be built into dll and
use it.Could you please tell me how to realize my idea?
   Thank you!
You
can't access LabVIEW globals directly from a caller to the LabVIEW DLL.
However there is no problem in providing specific accessor VI functions
to that global and export them as additional functions from the DLL.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Global Variables Question

How do I access varibles from within another function. For
instance, I load some variables from a txt file and once loading is
complete I assign some variables. The variables from the oncomplete
function is the variables I want to use in another function.
here is an example using a variable that is declared outside
the function
Example:
var variable1:Number = 5;
var myTimer:Timer=new Timer(1000);
myTimer.start();
myTimer.addEventListener(TimerEvent.TIMER, show_variable);
function show_variable(myevent:Event) {
trace(variable1);
The above code works as expected. It traces the variable 5 to
the output window every second.
What I want to do is to get the variable from a txt file. The
example below gets the variable1 from a text file named
Variables.txt.
Example:
var myURLLoader:URLLoader= new URLLoader();
var myURLRequest:URLRequest = new
URLRequest("Variables.txt");
myURLLoader.dataFormat=URLLoaderDataFormat.VARIABLES;
myURLLoader.load(myURLRequest);
myURLLoader.addEventListener(Event.COMPLETE, dataOK);
function dataOK(myevent1:Event):void{
var variable1:Number=myURLLoader.data.variable1;
The above code works as expected. But now I want to use
variable1 in the function below.
var myTimer:Timer=new Timer(1000);
myTimer.start();
myTimer.addEventListener(TimerEvent.TIMER, show_variable);
function show_variable(myevent:Event) {
trace(variable1);
How do I declare it as a global variable or reference it from
the dataOK function. I tried to declare it as root.variable1 but
that throws an error. Thanks.

Thanks. It was just a matter of defining the variable first
outside the function. Then in the dataOK function changing the
variables. The changed variables are available for the other
functions.
Example:
var myURLLoader:URLLoader= new URLLoader();
var myURLRequest:URLRequest = new
URLRequest("Variables.txt");
myURLLoader.dataFormat=URLLoaderDataFormat.VARIABLES;
myURLLoader.load(myURLRequest);
//Declaring the variables here and setting them to 0
var variable1:Number=0;
var variable2:Number=0;
myURLLoader.addEventListener(Event.COMPLETE, dataOK);
function dataOK(myevent1:Event):void{
variable1=myURLLoader.data.variable1;
variable2=myURLLoader.data.variable2;
test();
function test(){
trace("variable1="+variable1);
trace("variable2="+variable2);
I know there is always a simple solution. Just had to wrap my
head around it the right way. lol! Thanks for the help.

Call function in LabView from a DLL, then access global variable from DLL

I have created a DLL in LabWindows with a function and a structure. I want to call the function from within LabView and then access the global structure. I am able to call the function from the DLL with a "Call Library Function Node" and can access the return value, but I cannot figure out how to access the global structure. The structure is declared in the DLL header file with __declspec(dllimport) struct parameters.
Is there any way of accessing this structure without using the Network Variable Library?
Solved!
Go to Solution.

dblok wrote:
When you say "access to" or "the address of" the global variable, do you mean to pass the variable as an argument to the function call in the DLL? If so, then I was not really sure how to pass a cluster from LabView by using the "Call Library Function Node".
Yes, that's exactly right. I would include a pair of helper functions in the DLL to read and write the global variable. Alternatively you might write separate helper functions for each field inside the global structure, depending on the number of fields and whether you want to do any validation on the values.
You can pass a cluster by reference to a function that expects a struct by setting the parameter to Adapt to Type, so long as the cluster does not contain any variable-length elements (strings or arrays). The cluster needs to match the struct exactly, and sometimes that involves adding extra padding bytes to make the alignment work. Variable-length elements in LabVIEW need to be converted to clusters containing the same number of elements as the struct definition (for example, if your struct contains char name[12], you would create a cluster of 8 U8 values, and you could use String to Array of Bytes followed by Array to Cluster to convert a LabVIEW string into that format). If the struct contains pointers it gets more complicated, and it may be easier to write functions in the DLL to access those specific elements individually.
If you can't get this working or need help, post your code and an explanation of the error or problem you're seeing.
EDIT: it is also possible to include a single function in the DLL that returns the address of the global variable, which LabVIEW can then use to access and modify the data, but that's more complicated and likely to lead to crashes if you don't get the memory addressing exactly right.

Global Variable as an array

Hi All,
Culd you please tell me where I can declare a global variable as an array in PI 7.1.
In PI 7.O we used to store global variables in java sections and it was recognized across mapping in message mapping
In PI 7.1 I have declared a variable in init function in functions tab in message mapping but its not recognized in my mapping.
Could you please help me with this?
Where I have to declare a global variable so that I can use it anywhere in mapping?
Thanks in advance
Best Regards,
Harleen Kaur Chadha

Please refer to the below link about how to use global variables in PI 7.1.
/people/william.li/blog/2008/02/13/sap-pi-71-mapping-enhancements-series-using-graphical-variable
This link will help you understand how to use graphical valiable as a global variable.
Thanks,
Hetal

Set global variable in FOX formula

Hi all,
Does anybody know how to change the value of a global variable inside a FOX formula?.
I can get its value and assign to a local variable but I would like to set the global value after reading a keyfigure and make some calculations.
is it possible? maybe with some ABAP function call?
Thanks for your help!

Include characteristic HIRE in your 'fields to be changed' of planning function and in FOX write:
DATA L_HIRE TYPE HIRE.
DATA EXISTBPSID TYPE ZTA_BPSID.
DATA BPSIDNO TYPE ZTA_BPSID.
BPSIDNO = VARV(BPSTAS2).
FOREACH L_HIRE.
IF EXISTBPSID = '#'.
{L_HIRE,BPSIDNO} = {L_HIRE,EXISTBPSID}.
BPSIDNO = BPSIDNO + 0000000001.
ENDIF.
ENDFOR.

Build stand-alone application with Global variable

Question:
how to build a VI access a global variable into a standalone EXE file?
there are multiple VIs access to one Global variable, one of the VIs need to run in background to update the Global variable, whick i built into EXE file.
the rest VI will be called in from Teststand to retrieve the Global variable.
the global variable is updated if i run the background VI in labview, but after i build it into EXE file, it seems the global is not updated even the EXE running OK.

Hi,
Do you actually need to have an executable.
If you can call your global variable updater VI as a VI form, then your other VI's will still beable to see the Global variable.
You can launch you global variable updater VI in a new thread or execution so that it runs in the background and returns back to TestStand sequence so you can continue on with the rest of your tests.
Remember to close your global updater VI before you complete your test sequence run.
Regards
Ray Farmer

Global variable readonly

I chose to try/use a global variable to resolve a complex situation I was having. I followed the "Creating Global Variables" from LabVIEW help and everything seemed to work fine. The global stopped working, however, when I checked my files into CM and the xxxGlobal.vi (created by the global variable process) was readonly. I didn't see a runtime error, but the global always returned the default. Then, when I changed the file's attributes (enchecked readonly), I could exercise the other functionality.
Is this a known issue - do I have to make this global.vi read/write for all users, or is there another solution?

I don't think my conclusion (above) is correct. I had a case statement error that made it appear that the readonly was the issue, when it was not. I'm not sure what the deal is now. Here is what I did.
I placed a global variable(gv) in the block diagram of one VI, then double clicked on the gv and got a blank vi. I dropped a text control onto the front panel and named it ReportFormat. I then did a "save as" to save the new (global) VI. I then added some logic (where I originally dropped the gv) to populate the global variable with the user's selection from a drop down (two possible choices) . I then went to another VI and in its block diagram I did a "Select VI", found/selected this global.vi I just created. Since I only have one item on the front panel (in the global.vi), I received an association to ReportFormat. I did a "Change to Read" so I can use the string output to drive a case statement. The default case is always selected, though.

How can I access global variables in a loaded Applescript?

How can I access global variables in a loaded script, in Xcode, ApplescriptObjC? Basically, I have a global variable defined in my parent script using "property", and I need to modify objects connected to those variables inside of a loaded script.
Example:
Parent script:
script AppDelegate
property myTextField : missing value
//linked to a text field object
tell myScript to myAwesomeHandler_()
end script
Loaded script:
on myAwesomeHandler_()
myTextField's setStringValue_("The new Xcode is so glitchy ugh")
//changes value of linked text field of parent script
end myAwesomeHandler_
The problem is, the variable is undefined in the Loaded script, and I need it to have the same value as the parent script, and I don't want to pass the variable through the Handler. Any ideas?

I think want you are looking to do will need to be done in two steps. Because myTextField needs to be a property for the ObjectiveC part of the code you cannot turn it into a global.
However if you make a temporary variable global assign the string to it in the handler then set myTextField off of it.
global myTextFieldGlobal
script AppDelegate
property myTextField : missing value
//linked to a text field object
tell myScript to myAwesomeHandler_()
myTextField's setStringValue_(myTextFieldGlobal)
end script
on myAwesomeHandler_()
set myTextFieldGlobal to "The new Xcode is so glitchy ugh"
//changes value of linked text field of parent script
end myAwesomeHandler_
I know you stated you did not want the handler to return a value but I have to ask why? Global's, imo, are not a good idea and really should be used as a last resort.
One other possibility is to pass a reference to the property to the handler. Not sure if that works in AS of if that would satisfy our requirement of not passing the variable through the handler
<edit>
Another though have you tried to define the property outside the script? That is
property myTextField : missing value
script AppDelegate
Not sure if that will work.
You might also want to have a look at Scope of Properties and Variables Declared in a Script Object

Loading a text file into a global variable issue - really a global var?

From all the documentation and examples I can find, it appears that it would be
correct to create a global array variable [outside of any functions] to load image names into,
then use these images for a slideshow. I want to make the app dynamic, in that changing the text file gives a new set of images.
The global variable goes null [no values] after the load event listener. Why is that?
Isn't global, well global, and alive for the duration of the SWF?
PARAMS.TXT:
monthNames=January,February,March,April,May,June,July,August,September,October,November,De cember&dayNames=Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday
CODE:
var dNames:Array = new Array();
var mNames:Array = new Array();
var request:URLRequest = new URLRequest("images/params.txt");
var variables:URLLoader = new URLLoader();
variables.dataFormat = URLLoaderDataFormat.VARIABLES;
variables.addEventListener(Event.COMPLETE, completeHandler);
try
variables.load(request);
catch (error:Error)
trace("Unable to load URL: " + error);
trace("2 mNames 2: " + mNames[2]);
trace("2 dNames 3: " + dNames[3]);
stop();
function completeHandler(event:Event):void
var loader:URLLoader = URLLoader(event.target);
dNames = loader.data.dayNames.split(",");
mNames = loader.data.monthNames.split(",");
trace(loader.data.dayNames);
trace("1 mNames 2: " + mNames[2]);
trace("1 dNames 3: " + dNames[3]);
OUTPUT:
2 mNames 2: undefined
2 dNames 3: undefined
Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday
1 mNames 2: March
1 dNames 3: Wednesday
How do I access these values after loading from the external file, after the load?
Thanks in advance.

The statement you quoted from whatever Adobe documentation is correct.
If you want to load the data into the arrays before anything else happens, then have anything else that happens execute via the completeHandler function... after the data is loaded and processed into the arrays.
the command: loadFile() executes before the trace("2:" +images[4]); command. The loadFile function is processed and the loading process BEGINS... but starting the loading does not delay the main processing from continuing down the line--the loading itself becomes a secondary/background task. The command was to execute the loadFile function and the processing of that function was completed. If you don't believe so, then add a trace...
function loadFile():void
     vars.dataFormat = URLLoaderDataFormat.VARIABLES;
     vars.addEventListener(Event.COMPLETE, onComplete, false, 0, true);
     vars.load(new URLRequest("images/fnames.txt"));
     trace("started loading");
If you add that trace, you should see that the loadFile function execution is completed and the next line in your code is then processed... trace(2....)
The addEventlistener does not stop anything. The addEventListener code is assigning a monitor, not a traffic controller... it is telling the monitor to indicate when the data has finished loading. It is not telling anything to stop program execution.
So if you want to wait until the data is loaded before you do anything else... it goes....
function onComplete(evt:Event):void
     var urlVars:URLVariables = evt.target.data;
     images = vars.data.images.split(",");
     tnails = vars.data.thumbnails.split(",");
     ................HERE.................

How do I load a vi of global variables whenever LabView opens?

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