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?

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

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.

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.)

How to read values from Property file into BPEL process local variable?

I would like to use a Property file with some parameters e.g.
<myparm1>12345</myparm1>
How can I read from a BPEL process such a Property file and assign it into e.g. local variable "intparm1"?
Where (in which directory) should I put this XML Property file to have it always available for reading?
Peter

Hi,
You can also use
ora:readFile( ) function as follow :
ora:readFile(xml file location (ex. "file:///D:\\SOA\\FileAdapters\\readFile\\test\\test.xml"),xsd file location (ex."file:///D:\\SOA\\FileAdapters\\readFile\\test\\test.xsd"))
inside the assign activity and assign this to the variable you want.
regards
arababah
Edited by: arababah on Aug 10, 2009 12:55 AM

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)

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 read values from Property XMLfile into BPEL process local variable?

I would like to use a Property file with some parameters e.g.
<myparm1>
12345
</myparm1>
How can I read from a BPEL process such a Property XML text file and assign it into e.g. local variable "intparm1"?
Where (in which directory) should I put this XML Property file to have it always available for reading?
Peter

Hi,
You can also use
ora:readFile( ) function as follow :
ora:readFile(xml file location (ex. "file:///D:\\SOA\\FileAdapters\\readFile\\test\\test.xml"),xsd file location (ex."file:///D:\\SOA\\FileAdapters\\readFile\\test\\test.xsd"))
inside the assign activity and assign this to the variable you want.
regards
arababah
Edited by: arababah on Aug 10, 2009 12:55 AM

How to pass local variables between different sequence files?

Actually i want to pass the data (local variable) from my process model file to a client file. The client file only has the callbacks and those callbacks require some parameters as input which is available in local variables of my process model sequence file. I do not want to use Station Globals.
Please tell me any other way by which i can pass that data.

Which Locals do you want from the model. Every sequence has it's own Locals and there are a bunch of sequences in every process model. Do you want the entry point's Locals? A callback's Locals? Just one of the sequence's Locals? Some Models have way more entry points than others. What if your sequence file is ran with a different entry point?
One option is to create your own callback in the model and pass the data to it as parameters. Then add that callback to your client sequence file and get it out of the parameters.
If you simply want the entry point's locals and you are in your Main Sequence then you could use RunState.Caller.Locals.VariableName. This assumes you will use the same entry point every time you run that sequence file. Or assumes that every entry point you run has the same Local variable name.
Maybe there is an API method that exposes what you are looking for. What is your goal?
Regards,
jigg
CTA, CLA
teststandhelp.com
~Will work for kudos and/or BBQ~

Can TestStand 2.0.1 store/compare strings (local variables, strings in *.ini files) as unicode strings?

Can TestStand 2.0.1 store/compare strings (local variables, e.t.c) as unicode strings? If so, how can I tune TS to do it? Is there built-in support for such strings in newer versions of TS? I've not found sufficient information on the matter at the DevZone Forums.

Hi Paul,
Try this example, I'm sure I downloaded this from NI website.
This just reads keys from an INI file but you can also write to an ini file by using the appropiate functions in the dll.
Hope this helps
Regards
Ray Farmer
Regards
Ray Farmer
Attachments:
ReadIniFile.seq ‏17 KB
IOWrite.ini ‏1 KB

How do I pass a local variable as a parameter to a JSP Tag File?

I wrote a custom JSP tag file, and I want to pass a local variable to it through a parameter, like this:
<% Integer someValue = new Integer(-5); %>
<my:TestTag value="someValue"/>
This doesn't work though - the result is the string someValue. Trying to do this doesn't work either:
<% Integer someValue = new Integer(-5); %>
<my:TestTag value="someValue"/>
the value attribute ends up being null.
I know I can work arount by putting the local variable in the request attributes then using ${}, but that seems like a lot of unecessary work. Does anyone know I can just pass a local variable to the custom tag through the custom tags parameter list?

I'm far from beeing an expert, but this may be a clue (?)
Basically, the rule is: everything you want to be considerred as Java must be in a
JSP tag.
As an example, think of how you would do to pass the litteral string "someValue" otherwise. Then you may imagine other related issues...

Event ID 1012 - There was an error while attempting to read the local hosts file

When I start my Computer after it has been turned off overnight (switched off at the Power supply) I get a Blue screen and have to reboot the PC. in the Event log it has this error: Event ID 1012 - DNS client events - There was an error while attempting
to read the local hosts file.
Once the PC has booted evrything is O.K. I can restart the PC with no problems, it only seems to happen if the PC has been switched off for a while.
I am connected to the net via an Netgear dg834v4 Modem/Router
Windows 7 Ultimate
Intel Q8200 CPU
2 x 360 Gb HDD
ATI 4680 !Gb Video Card
Digital HDA X-Mystique 7.1 Sound Card
Aver media 777 TV Tuner card.
Thank you
jeepers01
After further Investigation it seems that this error is Not responsible for my Blue screening......I started my PC after leaving it off all night, and it started normally, but i still have this error in the Event Log - System.....I have searched the Technet
forums (and there is a lot of ID 1012 errors) but non relating to my problem....If anyone knows what is causing this error and how to fix it, i'd be Grateful....although it does not seem to affect the PC in any way that i can see.
thanks
jeepers01

Since Windows system uses separated user mode and kernel mode memory space, stop errors are always caused by kernel portion components, such as a third-party device drivers, backup software or anti-virus services (buggy services).
The system goes to a BSOD because there is some exceptions happened in the kernel (either the device driver errors or the service errors), and Windows implements this mechanism: When it detects some errors occur in the kernel, it will kill the box in case
some more severe damage happens. Then we get a blue screen or the system reboots (it depends on what the system settings are).
To troubleshoot this kind of kernel crash issue, we need to debug the crashed system dump. Unfortunately, debugging is beyond what we can do in the forum. A suggestion would be to contact Microsoft Customer Service and Support (CSS) via telephone so that
a dedicated Support Professional can assist with your request. Please be advised that contacting phone support will be a charged call.
To obtain the phone numbers for specific technology request please take a look at the web site listed below:
Microsoft - Help and Support
If you are outside the US please see
Microsoft Worldwide Home for regional support phone numbers.
Meantime we can try some available steps as a general troubleshoot.
1. Please remove the antivirus and run the system with a period. If the issue does not occur, mainly focus on antivirus settings and compatibility.
2. Disable Automatic Restart and see detail information on the blue screen.
1).Click Start, in the Start Search box enter sysdm.cpl.
2).Click the tab Advanced. Under Startup and Recovery, click the Settings button.
3). Uncheck “Automatically restart”.
4). On the drop-down menu “Write debugging information”, choose “Small memory dump”.
5). Click OK.
When Blue Screen displays, you may find some useful information.
Arthur Xie - MSFT

How can i read local excel file into internal table in webdynpro for abap a

Could someone tell me how How can i read local excel file into an internal table in webdynpro for abap application.
thank u for your reply

Deep,
File manuplations...............................
1. At the presentation level:
->GUI_UPLOAD
->GUI_DOWNLOAD
->CL_GUI_FRONTEND
2. At the application server level:
->OPEN DATASET : open a file in the application server for reading or writing.
->READ DATASET : used to read from a file on the application server that has been opened for reading
-> TRANSFER DATASET : writing data to a file.
-> CLOSE DATASET : closes the file
-> DELETE DATASET : delete file
If file is on the local PC,use the function module GUI_UPLOAD to upload it into an internal table by passing the given parameters......
call function 'GUI_UPLOAD'
exporting
filename = p_file
filetype = 'ASC'
has_field_separator = '#'
tables
data_tab = t_data
p_file : excel file path.
t_data : internal table
<b>reward points if useful.</b>
regards,
Vinod Samuel.

Local variable files is never read

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