The local variable abc is never read...!!!!!!!!!

Hi ..pardon me for this stupid and amateur question...
but like when we want certain variables to be declared and somehow we dont use them...what is the standard way of suppressing this warning...is there one prescribed in specifications..???

well thats what i cant do....i mean i have to declare
the variable ....it could be one of those reqts like
you have to get all the values returned by a
resultset in the proper order.....though you may not
use one of them.....so you have to do something like
int temp=rs.getInt("val");
and you would not be using this temp anywhere but you
have to get it from the resultSetdo
rs.getInt("val");instead of
int temp = rs.getInt("val");Edit: Although nothing requires you to read the column. If you don't need it don't read it, or better yet leave it out of the query altogether.

Similar Messages

How to avoid "The local variable ___ is never read" warnings

If you create an instance of a class using something like:
MyClass myClassInstance = new MyClass(param1, param2, ...);
And everything you require this class to do is done from within it's constructor then you always get a warning saying "The local variable myClassInstance is never read" with the class you're making this initialization from.
Is there a good practice technique to avoid these warnings?
On a large project this type of warning can become numerous and it would be cleaner to avoid them.
Thanks

TimThe.., I disagree about the result of a bad design
comment. In simple cases it can be beneficial to
only require an object's constructor, then that
object's actions are self contained and its methods
can then be called from its own constructor. In the
right situations this can help to loosen coupling
between classes and increase encapsulation.I disagree with that. If your code depends on behaviour that is carried out by a constructor, you have a dependency on a concrete class, which is a nice quick way to tightly couple classes. You'd achieve looser coupling if the desired behaviour was inside a method, which was in turn declared on an interface

Local variable files is never read

How do i fix an error that reads "The local variable files is never read"?

It's a warning, not an error. Your code will still compile.
You fix it by either getting rid of that variable, or using it. What's the point of having a variable if you never read its value?

Can you sort the "local variable" pick list?

My program has a lot of local variables. If I right click on a variable and click on "select item", a loooong list of all my local variables appears. They appear to be in the order in which they were created in my program.
Is there any way to modify the display to where the local variables appear in alphabetical order?
Amateur programmer for over 10 years!

The best solution is to not use a lot of local variables . Here is a neat trick to use local variables without having to use local variables . If you are using a state machine (case structure inside a while loop), create a cluster constant on the block diagram inside a state or case called "Local Defs". Inside the cluster, put constants for every local variable you will use. Label the constants like you would a local variable. Put a shift register on the loop border. Wire the cluster to the shift register on the right side. Do not initialize the shift register on the left side. In any case frame, you can wire from the left shift register into an unbundle or bundle to read or write to the Local. You never have to call the Local Defs state, the cluster will be defined because of the wiring. If using controls at many places, make a local constant for each control and have a state where the control is written to the local. Then you can read the local to use the value at any time. See attached vi for an example.
- tbob
Inventor of the WORM Global
Attachments:
StateMachineWithLocals.vi ‏45 KB

Log the local variables (string type) to the database (SQL Server)

i have a customized PreUUT callback so that my own VI gets the information from barcode. it contains serial number as well as other information. i am collecting the information into local variables of the PreUUT callback.
Now i want to log the local variables (string type) to the database (SQL Server).
i have a successful connection to the database and i am using a generic recordset schema.
can anyone help me how to do it?
also shall i have to create the corrosponding fields (columns) in the database? or is there any option in TestStand4.0 to do it?

Hello i like original,
After re-reading your original message, I think I might have a better understanding of what you would like to do. I have included a few links to Knowledge Base and Developer Zone articles that should be very useful for you. I have included these links below:
Logging a New UUT Property to a Database in TestStand
Logging a New Step Property to a Database in TestStand
Creating a TestStand Database Schema from Scratch
Thanks,
Jonathan C
Staff Application Engineering Specialist | CTD | CLA
National Instruments

Get all the local variables

Hi,
I found several API calls to get/set the local variables, if i know the name of the variable. However, if i want to get the list of variables from locals, parameters etc., how should i be able to get this from "ThisContext".
Thanks,
Regards,
Aparna

Hi,
This example may help
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=BCB5C685D37F104AE034080020E74861&p_...
Regards
Ray Farmer
Regards
Ray Farmer

What is the difference between using the command "dsmgmt" and the "Managed By" tab when adding users to the local administrators Account on a Read-Only Domain Controller?

When I use the
"dsmgmt" command to add a user to the local administrators account of a RODC I can actually see the user when I use the "Show Role Administrators" parameter. However, I can't see the members of the
group added to the "Managed By" tab of the RODC object in AD. Even though, the users added using
"dsmgmt" and by the "Managed By" tab can all log in locally and have admin rights to the RODC. Are there any differences between these two ways of adding users to the local administrators account?

Hi,
For groups, managedBy is an administrative convenience to designate “group admins”. Whatever principal listed in
managedBy gets permission to update a group’s membership (the actual security is updated on the group’s AD object to allow this).
In Win2008 and later managedBy also became the way you delegated local administration on an RODC, allowing branch admins to install patches, manage shares, etc. (http://technet.microsoft.com/en-us/library/cc755310(WS.10).aspx).
On the RODC, this is updating the RepairAdmin registry value within RODCRoles.
So the difference between them should be only the way they do the same thing.
For more details, please refer to the below article:
http://blogs.technet.com/b/askds/archive/2011/06/24/friday-mail-sack-wahoo-edition.aspx
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Variable never read

I have the following code in my editor:
<jsp:useBean id="now" class="java.util.Date"/>
<fmt:formatDate value="${now}" type="DATE" pattern="yyyy/MM/dd"/>
<p>The time/date is now <c:out value="${now}" /></p>I am using Rational Application Developer and get an error for the useBean tag above:
The local variable now is never read.
Any thing else I need to do to fix this?

The attribute scope is irrelevant.
The error message is coming from the local scriptlet variable declared by the jsp:useBean tag.
This:
<jsp:useBean id="now" class="java.util.Date" scope="page"/>
<fmt:formatDate value="${now}" type="DATE" pattern="yyyy/MM/dd"/>Would translate into code approximately equivalent to the following
java.util.Date now = new java.util.Date();
pageContext.setAttribute("now", now);
SImpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
out.println(sdf.format((java.util.Date)pageContext.findAttribute("now")));Note that it declares a scriptlet variable - which is what the compiler is complaining about.
You could shut the compiler up by including a line such as
<% now.getTime(); %>
But thats just nasty.
Much better to just the compiler to ignore this issue in JSPs

Local variable is never used

I have some code like this:
String s = null;
if (<some test>)
s = "whatever";
}Eclipse tells warns that the local variable s is never used, which is somewhat understandable since the assignment of s is nested. Still, it's annoying. I don't want to turn off the warnings because I like to be notified of them in order to keep the code clean. Is there a reasonable way around this?

It has nothing to do with it being "nested". Even without the if, the variable is not used. It's only assigned to. But you never use it. You never pass it to a method, or assign it to any other variable.
You can
* Get rid of the variable, since you're not using it for anything.
* Use it.
* Ignore the warning.
* Turn off that warning in eclipse's settings. (Not recommended, IMHO.)

Inserting in the UUT_Results table a value that we read from our data base from a local variable

We would like to include in the UUT_Results table a value that we read from our data base into a local variable during the execution of our sequence file. We found that by modifying the configure database options we were able to add a column for this variable, but the local variable was not available to be placed into an expression for that column from the local variables or parameters. Is it possible to do this, and if so, how? Station Globals were available to be included in the expression, however the sequence file may be executed on more than one system which makes the Global unavailable on systems other than the one where the sequence file originated.

You can use the TestStand API to programmatically create global variables at runtime, thus ensuring their existence. For example, you could call Engine.Globals.SetValString("GlobalStringVariableName", PropOption_InsertIfMissing, "variable value")
Of course, if you need to test multiple UUTs in parallel, a single global is not sufficient. In that case you might consider adding the field you need to the UUT datatype in the process model. You could then access the field in your sequence via RunState.Root.Locals.UUT.YourNewField = YourNewValue.
If you also want your sequence to run without using a process model, you must check for the existence of the UUT before accessing it. You could use the expression function: PropertyExists("RunState.Root.Locals.UUT.YourNewFi
eld")

How many ways to read and write a local variable in a called VI?

Ciao!
I'm producing my first TestStand sequence. It is called "FirstAttempt" and it is made by a single step which calls a VI. One of the first dilemmas i encountered realizing this sequence is how to read and write a local variable (created going in Variables -> Locals ('FirstAttempt') -> <right click to insert local>) in the called VI.
The first way (the only one i tried) is to create a control and an indicator on the VI front panel, connect them to their respective terminals in the connector pane and then specify (going in Step Settings -> Module) that these connectors (shown in the Parameter Name column) are linked to the local variable (selected in the Value column).
The second way (not tried) consists in using TestStand API: create a Sequence Context reference on the VI front panel, link it to a property node in the block diagram, select the property "Locals" and extract from this the local variable name and value which, i think, can be readable and writable.
So...
Are the shown ways correct?
Are there other ways?
Knowing that a "local" variable can be considered "global" within the whole sequence, is there the possibility to simply create a reference to the local variable and use the reference in the called VI block diagram in order to save space in the connector pane (if using method 1) or in the block diagram (if using method 2)?
Thanks!
Message Edited by aRCo on 09-17-2009 05:09 AM

Hi,
Before TestStand 3 you would use the second way you quoted as its the only way.
But now you would use the first way you quoted. You may still what to pass the SequenceContext if you were going to use the TestStand API. For TestStand 3.x and above you would use this way as the first chose. (Personnelly, I would not pass the SequenceContext into a VI if I know it was never going to be used in that VI.)
Not sure I understand your final comment, maybe you are liking it to passing the reference of a control to a subVI so that the control can be updated from within the subVI.
If this is the case and you had a situation where you had a step that was running in parallel with the rest of the steps in the sequence either as a separate thread or execution and were dependent on the contents of the local variable changing from that parallel running step, then you would have to use the API SetVal method to change the local.
Hope this is clear.
Regards
Ray Farmer
Regards
Ray Farmer

How to use local variables declared in b/t the methods in other views

Hi
i need to use the value of the local variables declared in b/w the views in one other view,as i have manipulated the value based on some condition & want to use it in 1 more view for my req.,but that variable is not global one just for once i need to use it,and i can't again write the whole for its conditions,as its there in initialization view,which if coded again,can hit the functionality there,so is it possible to use the value of such local variables thereafter or not,if yes pls let me know,or i need to declare the global variable for this.

hi,
1.Declare an Attribute in Component controller.
2. Pass the value to this Attribute in View V1.
using :
wd_comp_controller->Att = 'Saurav'.
3. Now in view2 , you can access this Attribute using:
data lv type string.
lv = wd_comp_controller->Att .
Here Att is my attribute of type string declared in component controller.

How do I mark an recently copied email to the local folders as read?

I have a message filter for a local imap account setup to copy messages to the Local Folders. I do this because the imap account is actually an exchange account with a ton of email and I can't keep all of my email in the main exchange account so I use an exchange online archive which is hidden to thunderbird due to compatibility. Copying to local folders allows archiving and full searching all while keeping keeps thunderbird very fast. Alternatively if I have more than lets say 50,000 emails synced over imap from exchange compatibility things become horrendously slow.
Currently I have a message filter that copies messages from my imap to Local Folders. If I try to mark it read after the move, as in while in Local Folders it does it afterwards and I then miss the message. My goal is to only mark it read in Local Folders.
The problem is if I try to mark the copied message as read it must do it prior to the copy, which ruins my ability to keep track of what I have and have not read yet.
I tried to put another filter under Local Folders that just marks all messages that come into local folders marked as read but it doesn't take unless I run it manually on the folder. My understanding is that this occurs because the copy doesn't happen at the same time messages are synced.
How can I have it so the messages in the local folder are marked as read?

Done some searching and located an addon which is not auto run, but is quicker than writing filters etc. It creates a button/icon to use to mark all emails in selected folder as read.
* https://addons.mozilla.org/en-US/thunderbird/addon/mark-all-read-button/
'''How to install addon:'''
Download to desktop.
In thunderbird
Tools > Addons
Click on gear wheel icon and select; Install addon from file'
locate the file you downloaded and click on Open
You may need to restart Thunderbird at prompt.
'''Second option:'''
If you do not want another icon to add to toolbar - it does get messy if you keep adding icons :) then there is another method of adding it to the right click drop down context list of folders.
Make hidden files and folders visible;
* http://kb.mozillazine.org/Show_hidden_files_and_folders
In thunderbird
* Help >Troubleshooting Information
* click on 'Show folder' button
* '''Close Thunderbird now - this is important.'''
It will open showing Profile folder name contents.
You will see a 'Mail' and an 'ImapMail' folder plus other stuff.
* Create a new folder called '''chrome''' Note the spelling. It should be in same location as 'Mail' folder.
* Open Notepad
* Copy paste all the section between the two lines below
* save the file as '''userChrome.css''' in the '''chrome '''folder - note all spellings.
then restart thunderbird.
Right click on eg: Local Folder Inbox
you should see an option 'Mark folder read'
<pre>
* Do not remove the @namespace line -- it's required for correct functioning
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
#folderPaneContext-markMailFolderAllRead {
list-style-image: none !important;
</pre>
----------------------------------------------

Create Local Variable in Custom.pll

Hi,
I want to create and calling local variable in custom.pll. As i know, we can create local variable with personalization form. but i didn't find the way to create local variable in custom.pll.
Is there any way to create local variable in custom.pll and calling that variable ?
Thanks

I think what you want is to create a GLOBAL variable, a LOCAL variable would be available to the Procedure/Function being executed. But to create the local variable, you add it between the Function/Procedure declaration and the begin
PROCEDURE abc(p_input VARCHAR2);
v_count NUMBER := 0;
BEGIN
END;
A GLOBAL reaches out past the execution of the proc defined in CUSTOM.pll. You can simply type GLOBAL.<var_name> := <value>.
BEGIN
GLOBAL.xx_count := 0;
END;
Though I like the ability Personalizations give you of using Init Value vs. Value, Init Value will assign a value if the variable does not exist ... and creates it. Value just assigns a value.
Some say you have do a COPY(value, NAME_IN('variable name')) instad of GLOBAL.<variable_name>, I have never had to use this.

Data Acquisition - using local variables to write data to a file

Hello,
I am running a Data Acquisition vi (currently in LabVIEW 7.1 but soon to be updated to 8.2) that collects ~100 parameters of data from several sources contained in a while loop. The current configuration (which I did not write) uses very few subVIs and writes to ~100 local variables to store each parameter. It then reads all the local variables and builds an array of all the strings, converts then to a spreadsheet string, then uses the write characters to file function to append to a datafile. I am trying to clean things up and have came up with subVIs to collect the data from the following sources:
8 serial port sources collecting btwn 8 and 20 parameters each
~15 thermocouple readings
~10 analog inputs
~20 parameters read off an ARINC 429 bus.
I have come up with a subVI to read each of the sources and have placed the subVIs in the while loop. Each subVI outputs the data that it collects in array or cluster form. I was wondering how best to write each parameter to a CSV file at between 1 and 10 Hz. Should I write each subVI output to a LV and then read them off as was done before (the difference being that I have reduced the # of LVs to ~10 vs >100?
I should add that precise timing is not that important, so if all the subVIs are not collecting simultaneously (which I understand that they won't be), it does not really matter.
Thanks.

Hi jilla,
jilla wrote:
What I think that you are saying is to turn the outputs of the 4 subVIs into inputs of a 5th subVI that writes to the data file. Correct?
Yes. It may sound like a fine-point, but I beileve it's better to create a VI specifically for formatting data - in your example, 4 arrays IN, a single string OUT. Then write the string to file as a seperate operation. GUI-displayed data can go through a similar transformation, the four arrays wired to a subVI which builds output-structures specifically for display. It's a beginner's mistake to put lots of individual controls and indicators on the screen when groups of them are naturally related (in an object-oriented sense.) Use clusters to group related controls - this will keep the diagram much cleaner.
One more question: at what point (either # of data points or frequency of data collection) does it become necessary to use queues? Thanks.
Well, there's not really a clearly definable "point". I'd say if your update-rate climbs above 100Hz, or you witness poor program or system performance, then it's time. The scenario you've described is a fairly simple acquire/display&log loop - and simple is good. Then-again people can't see/react-to updates faster than about 10Hz - so it doesn't make sense to sacrifice performance - if performance becomes an issue.
Re: queues: Queues are sometimes used to buffer data that's "produced" in one place and "consumed" in another.
Here, if/when logging data, you're logging with every DAQ. I wouldn't recommend using a queue to transport data from a "DAQ loop" to a "Logging-loop" - those functions can be in the same loop. Should/could a queue be used to get data from a "DAQ loop" to update the GUI at a lower frequency? Sure, but a Notifier might be a better choice. Further, in the (simple?) program you've described, you might use a case structure (True/False) to only update FP indicators every "X" iterations - a simple solution that doesn't require Queues or Notifiers.
Cheers!
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)

The local variable abc is never read...!!!!!!!!!

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