Errors with Global Variables

Similar Questions

• Digital control system, using limits of entry of data with global variables

  Hello!

  I have a Subvi with several digital control sliders. These control framerate, the pixel clock and exposure of a camera and their change in max/min/increment whenever one of them is changed - they are interdependent and get their information from the camera continuously during execution.

  I'm trying to remote control this VI, but during the passage of a value using global variables, it doesn't "stick".

  Example:

  The value for exposure is 237,48 Ms. different values are constrained to the nearest value. So if I pick 240,00 ms at the Subvi, he should know that this is not a valid value and change to Mrs. 237,48.

  But it is not do and I don't know why. When I enter the values manually, it works fine.

  Any suggestions?

  The limits on the controls that apply when their control from the front and is not passing values via the connector pane.

  You should use something like "line and force" within the VI to validate the values are within the range (maybe constrain data or return an error).

• If... Else if statements with global variables

  Hi people!

  I have a picture of a stove that I want to pass on the right sliding just behind the scene and swipe left left off the stage.

  The stove, at the beginning, is at the center of the stage.

  So, I have created 3 intial global variables (I ' ve introduced in the right position in... edgeAction.JS as described in this topic):

  Var Center = true;

  var left = false;

  var right = false;

  And in the stage-> Composition ready, I created 2 functions related to the SwipeRight and SwipeLeft events. I used if... If... statemens to check what position my photo's.

  swipeRight = function() {}

  If (on the left)

  {

  sym.playReverse (1000);

  Var Center = true;

  var left = false;

  var right = false;

  }

  ElseIf (Center)

  {

  SYM. Play ("Right");

  var right = true;

  var left = false;

  Centre var = false;

  }

  else {}

  SYM. Stop();

  }

  }

  swipeLeft = function() {}

  If (in the Center)

  {

  SYM. Play ("left");

  var left = true;

  var right = false;

  Centre var = false;

  }

  ElseIf (right)

  {

  sym.playReverse (3000);

  Var Center = true;

  var left = false;

  var right = false;

  }

  }

  I think I did everything correct, but it does not work!

  Any suggestion?

  You can find the Web release and the project herefile.

  Thank you VERY MUCH in advance for your help!

  Davide

  I think that your statement of global variable is correct, but when you reset the values of the variables by using the var keyword, you are in a different scope.

  So, instead of this:

  swipeRight = function() {}

  If (on the left)

  {

  sym.playReverse (1000);

  Var Center = true;

  var left = false;

  var right = false;

  }

  ...

  Try this:

  swipeRight = function() {}

  If (on the left)

  {

  sym.playReverse (1000);

  Center = true;

  left = false;

  right = false;

  }

  ...

  HTH,

  Joe

• Help with Global Variables (RoboHelp HTML 6)

  I have created several global variables (more than 300) and began to use them in the HTML pages. I managed to locate the source file where all global variables are stored. Anyone know? I need to add this file into the source control software used by our company. I checked the file list source Adobe indicating in the RoboHelp help system, but none of them said nothing to the global variables in a source file. There is also another person who will help me add global variables to more than 300 HTML pages, so we need to make sure that she can get global variables on his computer by getting the file of our source control software.
  
  Also, there are the output files that I need to also add?

  See rhvariable.apj in the source. I guess there is nothing on the side of the exit, just the contents of the variable residing everywhere where you put in the subject.

  See you soon,.
  G

• formula with the global variable node

  Hello

  I'm tring using node formula with global variables as an entry and exit.

  but this is where I see the SW hangs forever.

  Either way, I am a novice to the labview.

  Can some give me advice why this is happening?

  Thank you in advance,

  Do

  As smercurio mentioned, if you described what you wanted to do, we could show you things that can be done using LabVIEW.

  For example, loops For may not be not necessary if you are trying to extract or manipulate data in tables.

  It is good that you have a job, but it would be better to learn the power behind LabVIEW.  Who knows, you can actually walk away from C code...

• Global Variables are preferable to the Globals functional - so there! :-)

  I feel a little controversial today so forgive the brutal title of this post

  I've never used global variables because I was under the misconception that they are somehow 'bad '. That's all I've heard since I started learning the LabVIEW. Review the code in the nets upconvert and downconvert. The ugliest code uses globals and some of the most beautiful code does not work. This means that bad programmers use global variables and globals are so bad programming practice. This is not true. Globals are just easy to use for newbies to use them. ' Not initialized what? I can't find those on the pallette? »

  I think I always wondered unconsciously that globals are bad. They are not bad, it is their use that may be bad. This is true for anything in life.

  The first and the most obvious problem with global variables is racing conditions. But this is not strictly the overall causing the race condition. This is the data stream is not defined.

  

  But the same is true if functional a global being misused. In the example below there is nothing to enforce data streams.

  

  You must run the data flow with a thread of error for example.

  

  Globals do not have a thread of error but not fear - the man of the sequence is here!

  

  You only need the sequence if the global is directly on your drawing. These two structures of single image sequence could be replaced by a NumericWrite.vi and a NumericRead.vi containing nothing but overall, a command or the indicator respectively and the terminals of the error. Put it online and it is good as gold. Or you might have a Subvi containing nothing but a frame two cases selected by an enumeration containing the elements 'Get' and 'Set '. Now, it looks like a duck and quacks like a duck. Don't you worry by the overhead of the structure of the case either. If the enum is a constant, it will be unfolded.

  Another problem with globals, it's that they are, well, global. Is not different from a functional overall, so it isn't really a problem anyway. Globals and globals functional it is easily taken by placing them in a library and define the scope of the access. Not to mention that libraries give you namespaces and "namespaces are one honking great idea - do several of these!" *

  The real reason to use a global rather than a functional overall is that they are about twice as fast.

  Until this morning I would have recommended to use a more functional global overall. But I changed my mind. Someone can it change back?

  * The Zen of Python

  
  

• Is it possible to replace occurrences of a global variable massively while also setting up the components of connector?

  I work through some of my old code now, looking to increase the performance where I can. Here's my situation:

  1. I used Global Variables to spread a few constants in my screws, instead of a proper typedefed cluster.

  2. execution does not have an extension, but no matter when I save the project, I would say 50 to 60 percent of the economy/compling time is spent on the screw of 300 or more with global variables. I suspect it has to do with the link between the overhead associated with the global.

  3. Ideally, I would like to replace this:

  

  With something like this:

  

  While also putting the connector of this pane:

  

  To do this:

  

  What is the VI server is capable of? You can assume that the VI in question have very predictable names, matching the regular expression:

  subname[0-9]^3
  

  Is it still worth it to replace?

  I don't know what you mean by compile time.  One of my big projects LabVIEW RT, which has about a thousand of screws, a lot of VIGs (FGVs), engines of the Action, even a few Globals and variable shared.  In my case, the thing that seems to "slow down" the compilation the most is the links to the report generation tool (I use Excel workbooks for 'drive' of experience and also save the data a bit).  If I do a building together, to build this routine and about 6 'support' routines (data analysis, utility Configuration, etc.), it may take a minute, but I can't find this excessive nor a charge (compared to the facility to isolate/encapsulate features in screws as FGVs).  So I guess I don't understand the "real problem"...

  Bob Schor

• Replacement of a URL with a Global Variable - syntax error

  I had a link URL address as following 30 places for printing the reports. That's why I decided to replace this URL with a global variable.
  
  The code was like this:
  
  Select ' < a href = "http://oasdev.oh.gov/reports/rwservlet?GDMS_ACR & Y ='|" : P106_YEAR | "& B =' | : P100_BUSINESS_UNIT_ID | "& C =' | : P106_COMMISSION_ID | "& d =('||) To_char(sysdate,'MMDDYYYYhhMISS') |') ...
  
  When I replaced it with the global variable like this:
  Select ' < a href = "GLOBAL_URL/reports/rwservlet. GDMS_ACR & Y =' | : P106_YEAR | "& B =' | : P100_BUSINESS_UNIT_ID | "& C =' | : P106_COMMISSION_ID | "& d =('||) To_char(sysdate,'MMDDYYYYhhMISS') |') ...
  
  It does not provide the value of the global variable. It shows that Web page not found error. Can anyone help?
  
  Thanks in advance
  Gouri

  Hello Kawa,

  When you say variable overall, do you mean to say the element of application level? If Yes, then you need to refer to that element, the same way that you reference level page elements using the: syntax.

  Change your query to something like this...

  Select '

  Thanks,
  Machaan

  href=" "="">

• Functional global variables with polymorphic VI

  Hello

  I am keen to build a functional global variable in a polymorphic VI. So, for example in a functional global variable, we have case structure. I want to build separate VI for the structure of the case and make a polymorphic VI.

  Is it possible that I could use a polymorphic VI rather than business structures?

  Thank you!

  You could create a polymorphic VI that serves as a wrapper for the FGV.  The idea is that each instance of the polymorphic VI called FGV with selected appropriate case-sensitive.  Then your API is the polymorphic VI instead of FGV.

• static reference with the global variable

  Hi, I used a static reference to a Subvi where I change a global variable before (3-4 years ago) and do not remember how I did it.

  It was something like these attachments, but now I'm using LabView 2013 instead of LV 8.6.

  The change in the overall operating system sees only not in the main vi (looks like the invoke node run vi does not work with globals).

  In addition the vi close with the invoke node close vi but not if I put the custom in the Subvi properties to automatically close.

  dkfire wrote:

  Why not call the sub vi as usual, just with the setting to display the front panel, when it is called?

  Use the connector pane to transfer the value of the sub vi Ok button when done.

  That's what I recommend.  If this is not possible for some reason, then you will need to use a flat Structure of the sequence to force the reading of the global variable after the Subvi is complete.

• Run-time error '91'; Variable object or with block variable not set "

  Help, please... I had "run-time error '91'; Variable object or with block variable not set "for kawai2004 game.  Please help how to fix this error.  Thank you very much.

  Hello

  See the following article
  http://support.Microsoft.com/default.aspx/KB/822521

• With the help of semaphore with a Global Variable - correct use?

  Hi all

  I looked in the use of global variables and in my case, it seemed with the help of a semaphore is the appropriate solution.

  In my case, I use a global variable to store the State of the system. Asynchronous two with screw environment (same VI) will follow two COM ports to see if they get a ' login:' command prompt. If the COM port is associated with Alpha, Charlie, or Echo, it increments by 1, and if it is associated with the Bravo, Delta, or Foxtrot, is incremented by 2 GV. If the GV is 3, the rest of the code will run. In this case, it must be a port COM A, C or E; the other should be B, D or F.

  A VI parent is called inside a loop. He works for the first loop. He never adds up to 3 on the second loop, however. I can't understand why. Please let me know if my code is a poor use of semaphores, or if there is debugging I can try.

  I'm still relatively new to LV, so I'm sorry if my screws are difficult to read. I created this in LV2011.

  Thanks for any help!

  CelerityEDS wrote:

  The output of my time looping (wait GV = 3) goes to the structure of the case on the bottom right (clear SGS, PasswordEntry, etc.), so the GV get indeed consulted by the upper case structure right.

  ??

  Your right upper case structure does not run until your time ends in a loop.  The while loop does not stop until the total is equal to 3.  Where can increment you the world besides structures case you cannot yet?

  Have you tried in your point culminating execution of the VI in order to see how they are actually running?

  Another problem that I see.  Assuming that your first while the loop is going to end.  In the structures of your case, you lock the semaphore.  But you can never unlock the semaphore unless you have the right combination of conditions that allow you to get to the case that unlocks the semaphore.  The conditions are based on data that are read before the start of the case of structure, which means that data will not be read and changed until it all ends.  You have the timeout of your lock semaphore connected on one of the cases, but your semaphore lock can never timeout because you do not have a value on his entry time-out.  I think you have a situation where you can lock a semaphore, then arrive at a situation where you can not unlock, then wind locking up of your cold code.

  I don't really think that you need a semaphore at all.  I think you can protect reading and writing functional your overall using a global variable, i.e. the motor action.  Overall, I think you need to rethink the architecture of your code.

• Global variable to capture the username with Form 6i

  Hello world
  I have a menu created with Forms 6i and the shortcut that I use to call the menu in its target the following: C:\orant\BIN\ifrun60. EXE userid = name of user and password MYFORM. FMX
  When I remove the user name and password of the target of the shortcut he asks me the user name and password so when I typed, I am authorized to enter the application, but I want to be able to store the username on a global variable and set the value on an item when the user selects the program that he or she wants to use , so they're not going to see the other users information.
  Can someone please help me to do this step by step?
  
  Thanks in advance!

  Try: SOULEYMANE. VARIABLE: = USER;

  The USER is a function that returns the user name, as SYSDATE returns the date.

• How to declare global variables with the help of another global variable in ODI

  I declare a variable gloabal using another global variable.
  Suppose for example that:
  
  I have a global variable empid.
  I'm decalaring an another global variable empname refreshing the global variables tab and select statement is
  
  Select empname emp where empno = #GLOBAL .empid - if I write like this I get the error message like character not valid.
  
  Select empname emp where empno = ' #GLOBAL.empid '-if I write like this I get the error message in the number not valid.
  
  I kept the datatype as digital and non-persistent action
  
  Help, please
  
  Thank you in advance.

  Hello

  You must perform this operation from a package.

  V1 (COOLING MODE) - OK---> V2 (REFRESH MODE)

  Thank you
  Fati

• How to extract file with LabVIEW Teststand global variables

  Hello

  My goal here is to extract all the contents of the global variables for file (names and the value of any types) in a sequence of my LabVIEW UI file.

  For now, I can only open a file of sequence of LabVIEW and get the number and the names of the variables (cf. vi) attached.

  But if my variable is a container, I would like to know all the contents of this container (and so on) and I don't know how to do it.

  In addition, I have to extract the value of variables that I don't know the type in advance...

  Can you help me?

  Thank you.

  Well I finally used the method "GetNthSubProperty" to work on each variable and I use the property 'Type' to know if it's a number, string, boolean, or a container. If it is a container, I repeat the process at a lower level... (see attached vi)