Pass by reference

Similar Questions

• Passing a reference to queue as a sequence with LabVIew API parameter

  Hello

  I'm running a sequence of Labview with the entryPoint.Run method.

  Now, I want to pass a reference to queue to TS for use as the parameter for a stage of the action (the action must information sent through this queue). I tried to move the queue as a parameter for the valVariant parameter of the object of Subproperty seuqence.

  LabVIEW throughs 1 error when I try to setValVariant.

  The reason why I want to do it is because I want to integrate the execution of the sequence in my draft framework for an actor.

  Is it better to move the refs to the queue as a reference to be able to send data to an application running?

  Thanks in advance

  Michael

  Hi Michael,

  It is not possible to use references of LabVIEW in TestStand queue, since they do not share the same instance of the application. You can pass a reference to queue as an integer (U32 or I32), but you can not use in TestStand.

  I found 2 ways for you to use:

  You can use the Action engines in LabVIEW to encapsulate the queue. There is some information about this option in this thread:

  Solved: queues of LabVIEW and TestStand - Forums of Discussion - National Instruments
  http://forums.NI.com/T5/LabVIEW/LabVIEW-queues-and-TestStand/TD-p/2554231

  However, with this option, you must make sure that the motor Action shift register leaves no memory

  .

  The recommended practice is to create the queue in TestStand using Synchronization Manager and then open this queue in LabVIEW. An example is available for this option:

  Using queues in LabVIEW - National Instruments TestStand
  http://www.NI.com/example/30108/en/

  I hope this information is useful for you!

  Alex

• Pass a reference to the shared variable

  I use two shared variables in a loop where I write one and read each other.  I need to repeat this loop 5 times, but each loop uses a different pair of shared variables.  These variables are shared between a vi on the computer and a cRio.

  It would be ideal to incorporate this loop into a Subvi where I can pass a reference to the two shared variables in and then read and write in threw these references.  Then I could just call this Subvi 5 times, instead of copying and pasting the loop 5 times.

  Is it possible that I can accomplish this?  I can't find an example that would achieve this.

  Thank you

  If I understand correctly, you can use the mode programmatic access to shared Variables and it would work.

  http://zone.NI.com/reference/en-XX/help/371361H-01/lvconcepts/sv_usingdynvarapi/

  http://zone.NI.com/reference/en-XX/help/371361G-01/lvconcepts/usingdynvarapi/

• Passing a reference to a type definition for a Subvi

  I created a type definition that I would use in my application. This definition of particular type is also the control of front panel to my top level VI. I wanted to pass a reference to this control to my sub - VI so that they could dereference as needed and in very rare cases, update the values on the front panel. However, as I created the application I noticed that I was breaking the control reference that I have updated the type definition. This implies that they type changes the reference that I change the type definition.

  How can I do to build the reference I need or there at - it another way to proceed that works as well. Even if I can't make a reference to the control that is bound to the type definition, I'm ready to move to a Variant that can accommodate the reference until I can build the type of data (reference) inside my SubVis.

  Hello

  You must simply pass a reference of generic control to the Sub.vi and then cast to the specific typedef. You will need to place a control dummy of this typdef on your Sub.vis Frontpanel and hide.

  Christian

• I can't pass a reference of function to another function?

  Hello
  
  Reminder of basic:
  I am trying to create a custom preloader class that uses a table to store a URLRequest objects queue, to load in the order. I have no problem with the queue or get the loader to load the URLRequests in order.
  
  I can't seem to pass a reference to a function (address think of c) in my preloader class. I want to convey the function reference to serve the event listener for the given URLRequest.
  
  Signature of the function:
  public function addItemToLoad (item: URLRequest, notify: FUNCTION_REFERENCE)
  
  Anyone know what the syntax is to pass the address of a function to be called at a later date?
  
  Think that
  FunctionName
  vs
  Nomfonction()
  
  Thank you
  Nomadic design

  Thank you

  I missed the caps. I tried the function, but the compiler received errors.

  I've actually taken a step further. I'm now pushing the function references in an array and passing the array in the function.

  public function addItemToLoad (item: URLRequest, notify: Array)

  I realized that I might need to notify several objects of full charge.

  Thanks for your help.

• Passing a reference MovieClip of Parenthood to button event?

  I try to refer to a movieclip which was adopted through the first class (Builder/instance, tried both) but failed to get an instance of key event to recognize. Because the button based around an event, I'm not sure of how to reference. I've stripped a lot of the code, but has left the classiquee function as button events are related to a structure of dynamic loop, the main reasons why I can't move the buttons to a different class.

  The example looks like this:

  package {}
  
  import flash.display. *;
  import flash.text. *;
  import flash.utils. *;
  import flash.events. *;
  import flash.net.URLLoader;
  import flash.net.URLRequest;
  import com.greensock;
  com.greensock.easing import. *;
  com.greensock.plugins import. *;
  
  Thumbnails/public class extends {Gallery
  
  public void Thumbnails()
  {
  trace ("LOCATION: thumbnails");
  }
  
  public void initThumbs (root_mc:MovieClip, site_mc:MovieClip)
  {
  
  trace ("THIS, PARENT:" + this, parent, site_mc);     WORK
  
  }
  
  private function _onDataReady (evt: Event): void
  {
  
  function overThumb(evt:MouseEvent):void {}
  TweenLite.to (site_mc.gallery_mc.title_mc.txtTitle_mc,.5, {alpha: 100});
  TweenLite.to (site_mc.gallery_mc.title_mc.txtRollover_mc,.25, {alpha: 0});
  }
  function outThumb(evt:MouseEvent):void {}
  TweenLite.to (site_mc.gallery_mc.title_mc.txtRollover_mc,.5, {alpha: 100});

  / / Only trace site_mc
  TweenLite.to (site_mc.gallery_mc.title_mc.txtTitle_mc,.25, {alpha: 0});
  }
  function upThumb(evt:MouseEvent):void {}
  
  } / / END OF upThumb()
  
  } / / END of onReadyData
  
  } / / END OF class
  } / / END OF packet

  I'm trying to figure out how to get the reference site_mc to the key event so it can trigger others clips nested inside (gallery_mc, etc.). If it's AS2 it would be a piece of cake, but now I have all these invisible walls for the passage of variable.

  If someone can tell me where my logic is wrong with that, so I can connect the dots, I would love.

  you don't need to redefine something nested clips.  you just need to get a reference to site_mc outside your Builder.  When a parameter (such as site_mc) is passed to a function (constuctor, another method of the class or only a function defined on a movieclip timeline simple vanilla), the parameter is only available in this function for this particular function call.  If you want available elsewhere, you must define a variable that is available elsewhere.

• passing a reference structure in a dll (cvi) of EEG, a mistake-17502; System-level exception.

  Creates a container that matches parameter in cvi dll.  I have the container facility by checking the death of struct C using packaging of 8 bytes.  With the help of the adapter of the CVI has created an action.  When the step is executed, I get this error (17502; Except for system-level).

  Have you created a type of data customized to represent the struct (you say that you have created a container)? You specify the field for each variable type structure in the custom data type? You must configure each field to say TestStand what data type to use, for example, a number can be a double, int, short, or char, and TestStand needs to know that in order to create a corresponding structure correctly. Did you create an instance of this type to pass into the dll function? Thanks for posting the definition of structure, you use c if possible, also, please describe exactly how you configured each variable in the definition of type (custom data type), that you have created. If you are able to provide more information, we can try to see if there is a problem with the custom data type configuration.

  You can also take a look at what makes your function, the function code could lead to a breach of access or another exception of system level. You can launch the editor of sequence of CVI process debugging to debug your code module, or change the setting of the ICB card adapter configuration run the code a an external instance of the CVI.

  Hope this helps,

  -Doug

• Creating and passing the reference to an object in j2me

  Hi, I'm new to Blackberry JDE, I want to know how to create, transmit and receive refernce for an object in Blackberry JDE.

  Exactly as its operation in j2se and Java everywhere else. Each reference to objects in Java is in function, that is to say, saying 'ButtonField f = new ButtonField()', f is a reference to a ButtonField object.

  It's all standard Java.

• Pass the string of subsequence reference to appellant

  Hi, I'm unable to pass a string parameter on the basis of a subsequence to its caller. Is there something by doing this, or is not possible?

  Thank you

  Chris

  Right click on the parameter in the subsequence.

  Make sure you only pass by reference is verified.

• How can I pass a string reference in java?

  Hello!
  
  My question is how to pass a string reference in java.
  I tried to declare my variable, instead of using 'string xxx = 'f';', I used 'string xxx = new String ("f");':
  
  Public Shared Sub main (String [] args)
  {
  String xxx = new String ("f");
  StatusEnum result2 = getErrorPointStr (xxx);
  }
  
  
  public StatusEnum getErrorPointStr (String text)
  {
  StatusEnum testStatus = StatusEnum.PASS;
  StringBuffer buffer = new StringBuffer();
  buffer. Append ("123");
  text = buffer.toString ();
  Return testStatus;
  }
  
  After the call to getErrorPointStr (String text) function, xxx = 'f'
  If it does not work.
  
  How can I solve this? It is very important, the function will receive String and nothing else.
  Thank you!

  800512 wrote:
  Therefore, there is no way to do it? I mean, the way, as I've just described:

  To return to StatusEnum and pass by reference String?

  This question has already been answered.

  It is very important for me to know this.

  And already know you, 'cause I told you in the first answer here.

  Perhaps if you explain what you're trying to accomplishand why you think that need pass a reference string - in other words, why you think that a reference string is a solution to your problem - in fact we could be able to move forward with help you to solve this problem.

  And No, despite what you think, your problem isn't that you 'need to pass a string reference. It's your solution to the real problem of attempted (and failed). So let's get down to that, shall we?

• Passing variables by reference

  Hello

  Is it possible to pass variables by reference as the arguments of a function?

  Thank you.

  All scalar values are passed by value. Anything else is passed by reference. There is no language syntax to control this behavior in AS3.

• How can I determine if a reference is null

  If all goes well, there is a simple answer to this question, but I have a vi where I'm passing in references to the input parameters, and I would like to make a comparison to see if they are null. How can I do this?

  

  "Not a path number refnum" will do it.

  Ben

• Call a DLL in TestStand by reference

  All,

  I developed a DLL that control a USB based power. The call of the dll works from TestStand 4.1 most of the time. What I think is happening, is that whenever I call the dll in my main sequence of the file as well as other files in sequence, as several instances of the dll is loaded.

  Part of the init of food must pass back a SESSION number that is used in subsequent calls to the dll. I store as a global variable in TestStand and pass around sequence that never he needs.

  How can I load the DLL at the beginning of the sequence and PASS a reference (handle) to all other calls to the dll?

  Thanks in advance

  Carmine

  Doug,

  Thanks for your help. I found a UnLoadModules() in one of the child seq that I missed. Unless I missed all the others, I think this should be resolved.

  Carmine

• Open FPGA references change to no. target when compiled with executable in time real start

  Hello again you useful forum fans!  I have a problem that I hope someone can give me a hand with.

  I have a project that has a Windows component and a component of the target in real time, that are running on a hypervisor type NI PXI-8110 system.  Communication both sides between them using shared variables.

  On the real-time side, I have four FPGA targets who are reading and writing various analog and discrete inputs and outputs.  I several periods loops which opens a reference to one of the FPGA targets during the first call, then pass this reference in several subVIs that read and write to panels prior to the FPGA.  The loops the FPGA reference thus made available and reuse it in the next iteration through the shift registers.  Each FPGA target has only a single reference open to him.  One of the loops is using the FPGA reference directly and does not pass it in any subVIs.

  It all works very well in the development environment, I can read and control inputs and outputs FPGAS via the front panel of the application of the side Windows.  It also works very well if I start the game real time in the development environment, and run the code of windows as a stand-alone executable file.

  However, when I compile the code in real-time in an executable startup and deploy it to the target, it does not work.  I enabled debugging on the executable, and when I connect to it via the operation-> debug executable in the menu, I see an arrow broken at execution.  Further investigation shows that each of the four open screw reference FPGA is now empty, the text under them is "no target" and the thread for reference on their part to my first Subvi is broken.  I need your help to understand how to operate as it does in the development environment.

  I followed the instructions of these two knowledge base articles to compile and download the bitfiles FPGA on the FPGA target and execute on start or restart:

  http://digital.NI.com/public.nsf/allkb/39795847AC67296D862575FB0046944F

  http://digital.NI.com/public.nsf/allkb/BC513C2A0DC29C89862574BF0002B0B9?OpenDocument

  Open FPGA reference screw are configured for the FPGA to build specifications that I created for each target in the LabVIEW FPGA project.

  I called technical support, NO phone, and yet were able to determine this one out, so additional "brownie" points if you do!  I would offer you the same no detailed screenshot that I have (I can't give more detailed code out because its owner, unfortunately), but apparently the forum doesn't like my image file, as I can't seem to load.

  Please let me know if you have any ideas regarding what is happening!  I appreciate it.

  Jon,

  I'm always up for the challenge.  Have you tryied recompile the FPGA VI that accesses the RT VI?  I also suggest to try and open the bitfile instead of the FPGA VI.  You run in dynamic mode (this is not a suggestion, it's just a question)? There is no difference if you try to open the FPGA VI reference outside the while loop, then past the reference to use inside the while loop without shift registers, then close the reference to the FPGA VI outside the while loop?

  Let me know if these suggestions makes no difference.

• Properties through control reference

  I have a group of digital controls. I would like to control properties of these individual controls (persons with disabilities, Visible, value, NumText.Format, and NumText.Precision) by passing a reference to the cluster on the main vi, to one under vi.

  Breast of my Subvi I wire my reference to the Controls property of [] cluster to get an array of references to elements within the cluster following the order of the items in cluster.

  Using this table of references I find properties available for the disabled, Visible properties and value options, among others. However, there are no options, to control NumText.Format and NumText.Precision.

  Suggestions, or perhaps another way to address the issue?

  Thank you!

  Table of control references will be a generic class and therefore cannot be defined specific propertiies. To access the specific control properties, you must cast to a more specific class first. If all controls are of the same type, you can simply throw all, using the "most specific type", for numeric types. This should make the NumText available properties for the parameter.