Initialization of a local Variable (variable uninitialized perhaps, but it is initialized?)
I have behaviors very weird with my code. Some error messages complaining about reference uninitialized variables has led me to search around and found out that the shareware I use has very little initialization of local variables. CVI gives warning of the compiler on these variables, and I don't think he has caught even near each other. I went through the whole file and initialized everything myself.
Even after that I booted my variables, however, the compiler always indicates they are unitialized, and my code still does not work. I've attached a screen of warnings from the compiler as well as one of the problem functions. Note that in the first warning (36, 9 WARNING: variable '(*tw1).i' maybe is not initialized when used here) there two notes under it, the one who told me where the variable is declared and who says "1, 1 Note: Add initialization to silence this warning. When I double-click on that note, he points to the top of the file, as if he says me to initialize the variable outside the function.
I also found a very similar post about this but the user has said they were defining the structure twice.
In addition, I understand that the screenshot I've not yet initialized the members of the struct, which I intend to do once that I get rid of these warnings.
What should I do to remove this error? Any help is greatly appreciated, I've been messing around with this for too long. Thank you!
I think that the strange warning is due to a bug in the analysis of the variables uninitialized in the compiler. The inaccurate diagnostic tests is issued at the line where you set a variable of local pointer to structure kiss_fft_cpx. It seems that the warning is caused during the pointer variable declaration is immediately followed by a local declaration of a structure of the same type:
kiss_fft_cpx * tw1 = NULL;
Basically, the incorrect diagnosis will happen:
- If a local pointer to a typedef struct variable is followed by a statement of the same variable type.
- If the second local variable declaration is not initialized.
- It doesn't matter if the pointer variable is initialized or not.
The bug can come because the compiler can guess that the region of memory in the data segment continues from the pointer variable through the definition of the second variable, because they are of the same base type. A possible workaround in your case would be to go to the declaration of the variables of the same type (in your case, the declaration of the variable t) before the declaration of the pointer:
kiss_fft_cpx * tw1 = NULL;
Fortunately, this problem is fixed in the latest version of 2015 LabWindows/CVI.
I hope this helps. I would like to know if the workaround works for you.
Tags: NI Software
I'm upgrading some software LabVIEW RT I inherited LabVIEW 2011 to 2015 LabVIEW (32-bit) on a host Windows 7 Professional PC. The target is an SMU-8135. The software ran well when it is compiled under LabVIEW 2011.
I modified the code to enable the monitoring of what is happening by looking at screen on the target outputs. The initial error that brought me here is that a local cluster variable initialized in the first window of the flat sequence described below have been appearing as the in windows later.
The code begins with the initialization of local variables in the first window of a flat sequence and provides a quick line of text output to the display of the target (call this text #1) (using RT Debug String.vi) I send two lines of text so that a new row is created and later text does not replace it. . It then writes to the next window in the sequence flat screen two groups of text output to the target. Second text in the window 2 (#3 text) output is equipped with a wire entry from the error from the first text output in the second window (text #2). That is the second exit must wait for the first exit to complete before being sent to the screen.
I see now some weird symptoms:
1. when I connect to the target under a remote debugging session I see expected display outputs. Not remotely connected, text #2 is displayed. The code passes to the third window in the flat sequence, so everything in the two window should have executed.
2. the text #1 appears on the target screen * before * I get the message "Welcome to LabVIEW Real-time 15.0." Is this normal? Whence this message? I searched my screws and subvis to this text and it is not there then it mucst come LabVIEW screws somehow.
This all started with local variables no initialization in the first window, so apparently, I have a problem of data flow. Given that the problem disappears under the remote debugging, I'm a bit of a loss.
Thanks in advance for any help,
Text 2 appears only when remotely connected it does not appear when running at startup.
Your "text 2" seems to be powered by a collection of nodes comments to "initialize on compile or load. This will return once the empty string the first and therefore should not be display nothing until the code I run a second time. That is the crux of feedback for?
I would like to get the opinion of the people. This thought just happened for me while I was reading some materials the other day.
And I have not found any topic which talks specifically about speed after searching the forum.
It is faster to initialize your controls/indicators using Invoke node OR write directly to the initial value of your local variables?
From my experience (not large), I have always used the invoke node to initialize controls or indicators.
But when I but this question, I did a simple reference point and it seems the local variable approach is faster, especially
If you have the large number of orders/lights to initialize.
Am I missing something here? The invoke node running something that writing a value of local variable would not do?
I thought since you need to set the initial state by default for the node to invoke anyway, why not just write the desired initial value
your local variables?
I would appreciate if someone can express his own opinion based on their experience and knowledge.
Thank you ~ ~
I may need another Cup of coffee this morning, you are in fact callling the reset by default on each individual control. My last despises, it is that you use the default method Vals.Reinitialize VI all failing. It will probably be a bit faster than the method on individual controls. Still not instant, if.
Are a few msec is worth to you? If so and you consider the local path, my advice is to group as many controls as possible into clusters for minimize you headaches.
Just a quick question for out me of a hole... I use a local variable to control while loops, and based on a counter value, he makes it or not. When I probe the effective Boolean value, it can't be exectuted, but the value of the local flag is true? is it possible to change this? I need to stay wrong, until it is true!
See you soon
Any quick way to write code to initialize variables, withour reset the entire program?
I'm looking for a way to make a marquee on a Boolean LED. Currently, I use a local variable to make the scrolling action (see the code, the loop For on the right). However, this method requires CPU more power and also prone to several other error. Therefore, can someone help me to replace local variables with shift register? If possible, do not change the other loop. Thank you.
-l' scrolling action must be continuous
-use the attached config. file
-allows to test with any text message
Why do you think that you need so many loops?
Try this, perhaps this may give you some ideas...
(Look at buffer allocations. My table of Boolean 2D works at constant size and completely in place. Not only were constantly read and write to and from the local variables, you were also constantly growing and reducing the size of the table. It's very ineffiicient. I don't see the purpose of your outside while loop or FOR your first loop. None of your shift registers makes a lot of sense. You probably want to close the file of configuration (not shown in my modification)).
I use a control structure and the table event to detect changes in the value of table.
At the beginning, I have made changes in the table (for execution) and structure of the detected event.
The next step was adding a parallel while loop in which I write for the control array (using the local variable).
During execution the layout of the table changed indeed, but the structure of the event is a not detect it.
I have attached 2 digits: 1) loop of the structure of the event 2) the parallel loop.
It is possible works in such a way?
How can I make the structure of the event to detect changes in the software in the control array?
Changes made via a local variable are not the user events, so the structure of the event will not detect by definition. You must write to the command by using the property node "Value (follow the signs).
That said, your small watch of your code starts to raise red flags in my mind with the use of variable and global variable local. While it's not bad, their abuse can lead to the poor programming architecture and race conditions. Perhaps you should consider downloading your VI any kind can someone take a look and offer suggestions on improving it.
I am instantiating a .net (c# 2005) of Teststand assembly.
I want to get all the local variables of Teststand in my c# application and also to be able to define Teststand inhabitants of c#.
Does anyone have a solution for this?
Thanks in advance.
Here is an example of the CVI that perhaps you can use as a guide.
I'm a newbie in the use of TestStand, databases and SQL, and now I've met difficulties. I use TestStand 2014 (32 bit).
I have a need to know the number of rows in a database and save that number in a local variable. I tried to practice using the database of the Types of step provided with TS. I tried to use the following in a SQL statement:
Locals.NumberOfRows = ("SELECT COUNT (*) FROM TEST_TABLE")
It returns an error: specified value is not the expected type. My goal is possible in this way, or I'm doing this completely wrong?
Thank you for your response, Norbert. I have a database of who wins new values at random, and sometimes I need the exact number of rows in this table.
I managed to achieve my goal by using the SQL statement: "SELECT COUNT (*) as Rowcount OF TEST_TABLE", followed by a data GET operation, which records that number of lines in a local variable.
The program below is used to control a motor with the NI 9401. However, it has been designed to work in two ways, when you push the buttom "adelante" or "ago" he turns in one direction or another, but if you press 'Start' it begin to move in a particular way (which I mentioned) and if you press again the same ('Start'), we need to stop (this way you can push the door "adelante" or "ago" If you want to). The problem I have is with the "local variables", because when the 'Start' button is the I three while loop and I Don t know how said it stops when the 'Start' button has been pushed and the same when the 'Start' button is pushed, and I press the 'Start' button to stop it. I have a mess with the function of local variables.
I know it's a little complicated to understand by Word, I tried to explain more clearly. I hope you can help me.
Yes, I think that the problem was trying to use local variables in parallel loops. I use this property at the time of the node and it works!.
How can I copy Step.Result.Error.Code to a stage in particulat to a local variable.
I want to print the value of Step.Result.Error.Code in my test report.
Help, please. Thanks in advance.
Yes of course!
This is better handled by the recall of SequenceFilePostStepRuntimeError:
(1) StepResultCode (number) is added FileGlobals
(2) add SequenceFilePostStepRuntimeError callback to your movie file
(3) the next stage of the declaration adds the recall of SequenceFilePostStepRuntimeError :
FileGlobals.StepErrorCode = Parameters.Step.Result.Error.Code
Here is an overview of the sequence:
I hope this helps.
Sub AppMgr_UserMessage (UIMessage uiMsg)
switch ((int) uiMsg.Event)
10200-case: //update the UI to reflect the current status
progressBar.Value = (int) uiMsg.NumericData;
label. Text = uiMsg.StringData;
10201-case: //Close form, cleaning of the AppMgr reference
AppMgr = null; This. Close();
10202-case: / / send the text to the caller App test bench
label. Text = "10202."
uiMsg.AsPropertyObject (). SetValString ("Locals.opText", 0, "Something");
It is a code in your example of Panel floating .net
In the last case above trying to change one of the local variables of the test bench. I think that it is probably not wise to cast as a how PropertyObject uiMsg which I have here.
I think it is more likely that I'll have to pass the variable I want to change benchmark to the DLL.
Don't know how to do this, any ideas?
To do this, you need the coresponding SequenceContext!
Try uiMsg.Thread.GetSequenceContext(0,frameId). AsPropertyObject()
Maybe this thread could be interresting:
I tried to go around a series of data in TestStand as a string using "flattened chain" of LabVIEW. When I create a local variable in TestStand of type 'string' and try to write the cluster flattened at this that he simply not transmitted. If I convert the string flat binary table and then pass it around, I can recover all the data very well.
Is there something I'm missing here?
I've attached an example Teststand sequence that illustrates this problem. If you run this sequence that the 1st test will fail, which is the attempt to simply pass the flattened string data structure and the 2nd test will pass as it is the binary table that I generated from the flattened string.
crossrulz is correct. The Null character affects how TestStand handles the string. You will need to specify the string to a binary string in the list of settings both the VI. TestStand then encodes the stringso it can prevent the loss of data.
If you need work on the binary string in TestStand, you will need to convert it to an array of raw data with PropertyObject.GetValBinary.
In a sequence, we have to write or read from a local variable. Is it possible (for example right-click the variable) to find out related measures?
Are you talking about discover what steps use the local variable. Because the measures are not really "related" variables. Either they are or they aren't.
You can use the search/replace tool. Edit > find/replace
In the look for:, enter inhabitants.
You can check her search for: box, and then select the order in which you want to search. This should show you a list of all instances of the local variable.
Hope this helps,
I inherited code which has a cluster of CTL control nested inside another group of control CTL. If I drag the control nested outside the border of the other, I can right-click to create a local variable, I need to connect to the bundle name. However, as soon as I drag the inside the limits of external control, it breaks the local variable.
How can I create a local variable in a cluster THAT CTL nested in a second group CTL?
Is there some kind of reference OuterCluster.InnerCluster, that I can use if I do a local variable of the external group?
It turns that I need a local variable for the cluster internal.
JPG attached shows that I created a local variable for the external cluster (ParametersCluster), used a Unbundle based on the name to access cluster internal (EmptyParmeters) and can access one of the elements through an another Unbundle by name.
Why should I use a local variable in a loop of simulation, but not in a Subvi simulation?
Local variables will only work in a Subvi are those that relate to controls or indicators located in the Sub - VI. If you need to pass data between different from the Subvi, so you have several choices.
1. common variables, as you said.
2. global variables, as you said.
3. pass the data in or out through the pane of the connector of the Subvi.
4. functional Motors Global Variables/Action.
5 lines of
6. the references to the controls in the VI main so that they be used with nodes of property in the Sub - VI
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