Can strictly type refnum control do type coercion?

Hi all,
Can strictly type refnum control do type coercion? NI says yes:
A control refnum terminal that is strictly typed can only accept control references that are strictly typed to a compatible type. For example, if a subVI expects a control refnum of type Slide(Int32), you can wire a control reference of type Slide(Int32), Slide(Int8), or Slide(DBL), but not of type Slide(Cluster of DBLs). Wiring in the Slide(Int8) or Slide(DBL) will result in type coercion (no error) and thus a coercion dot as these representations are being coerced to Int32. Wiring the Slide(Cluster of DBLs) will result in a type conflict (error) and thus a broken wire. This is because the Int8 and DBL are numerics like the Int32 and can thus be coerced to be of Int32 representation. The Cluster of DBLs however, is not a numeric, but a totally different data type. Therefore, a cluster being of different data type than the numeric will result in a type conflict if wired together. Strictly typed references are most beneficial when you know exactly what type of data you will be using.
http://zone.ni.com/devzone/cda/tut/p/id/3159
I have seen this help file for long time, and been confused by it for long time. I don't think strictly type refnum control can do type coercion. If I put a U8 Enum refnum control on subvi's front panel, I can't connect it with a U16 Enum refnum control.
I don't know if I am right.

What is an "enum refum control"? Can you attach a small VI containing the various controls?
steady wrote:
Besides, I don't know what Slide(Cluster of DBLs) is. I can't generate such data type.
A slide control with multiple sliders is a cluster datatype. One cluster element per slider.
Just place a slide, right-click it...add slider. Voila!
LabVIEW Champion . Do more with less code and in less time .

Similar Messages

How to create a strictly typed refnum control using LabVIEW scripting

I wish to use LabVIEW scripting to create a strictly-typed refnum control that is bound to my custom control (a type-defined cluster), but I'm unfamiliar with scripting and can't see how to do it.
If I create a New VI Object, using Control Refnum as the Style, how do I provide my custom control to the VI Object Class terminal? When I try using a reference to my custom control.ctl file (using Open VI reference) I get an error: "Error 1057 occurred... Type mismatch: Object cannot be cast to the specified type."
Or, if I create a new Control Refnum as above, using a standard Cluster as the VI Object Class, how do I then convert this refnum control to a strictly typed refnum that is bound to my custom cluster control type?
Thanks in advance for any advice,
Thoric (CLA, CLED, CTD and LabVIEW Champion)
Solved!
Go to Solution.

Here we go...
You have to create a new Control VI and then specify the VI Type as Typedef.
Regards,
Da Helmut
Attachments:
example.vi ‏22 KB

Control Value:Set [Variant] Method - how can i use this with strict type definitions?

I want to pass default values to a strict type definition from a mainVI to a subVI, but I'm not allowed to use the "Control Valueet [Variant] Method" invoke node to do it. How else can I achieve this?
thanks,
Z

Hi Z,
If you use strict type defintion references you can use Call by reference Node. Depending on the connector pane for the subvi which is referenced you just wire your data to the corresponding terminals. I attach an easy example which dynamically opens and writes to an arbitary number of a template.
Hope it helps
Pelle S
District Sales Manager
National Instruments Sweden
Attachments:
Call by reference node.zip ‏20 KB

Coercion dot and strict type definition

Hello,
I seem t be having some problems learning how to use strict type defined controls, would someone please help?
Will you please tell me why the coercion dot is on the subVI's?
Will you please tell me how to link the 'CtlsToWLp Cluster' from Main.vi and the 'Clust Refnum' from the WLp2.vi to the same .ctl?
Thanks,

This is a duplicate post, being answered on
http://forums.ni.com/ni/board/message?board.id=170&message.id=191715

Setting control to default value when it is a strict type def

If my subVI has a control that happens to be a strict type defined cluster and I have saved the values in the control as the default values, how can I change them back to the default values of the type def (which are empty). Because it is a strict type definition, i cannot click on the elements inside the cluster and modify them (e.g. click on an array inside the cluster and do an empty array operation.)
In the attached screenshot, the control "BLE Meters To Test" is just an array of clusters and I was able to empty the array. The control "Capture Data" is a strict type def. I would like to clear the contents of this control without having to delete the control and add it back with a new instance of the same strict type def.
Solved!
Go to Solution.
Attachments:
screenshot.PNG ‏33 KB

are you talking about edit mode or run mode?
You could temporarily add a second instance of the typedef (all empty), then change it to a constant. Whenver you need to reset at run time, write the new digram constant to a local variable of the control.
glstill wrote:
Because it is a strict type definition, i cannot click on the elements inside the cluster and modify them (e.g. click on an array inside the cluster and do an empty array operation.)
Make sure to click on the array container, not on the array elements.
LabVIEW Champion . Do more with less code and in less time .

Determine if a control reference is a strict type definition

If a VI is passed a control reference it can determine the VI Server Class using the ClassName property but how can it determine if the control reference is from a control which is based on a strict type definition?

That a pretty neat little VI you've found, Darren. Kudos!
The solution that Darren presents, however, will not tell the difference between a typedef and a strict typedef (unless I'm missing something). If you have VI Scripting enabled (see attachment for where to enable this in the Options menu), you can expose the Is Typedef? property.
This returns an enum with the following values (as pictured)
not a typedef
typedef
strict typedef
class private data
Although this property is not settable in a VI at run-time, it should be readable.
Below is a picture of the Options menu where you can enable VI scripting
Mitch
Attachments:
VIScripting.PNG ‏33 KB

Change strings of (strict type def) refnum

mitulatbati wrote in http://forums.ni.com/ni/board/message?board.id=170&thread.id=233257&view=by_date_ascending&page=5:
Hi,
I have made a strict type def, which is a text ring. I open the VI reference -> get Panel property node -> Controls[] -> Index first element (there is only one, the ring) -> change Strings and values, and then close reference.
If I call this subvi from a VI, which includes this strict type ring, it will be only updated, when I restart the VI. And not in runtime. I don´t get any error, everything looks fine, but the strings and values are not updated :-(
Is there a way not to restart the VI, but to modify the ring programatically?
regards
MB
Message Edited by shb on 07-29-2008 11:52 AM

Hello mitulatbati,
I do something similar with a Combo Box. The reference to each box is stored in an unitinialised shift register of a VI. When I want to change the selectable text, I do it in a for loop for every stored control.
A VI doeing this for Rings is attached (LV8.2.1).
Greetings,
shb
Attachments:
Demo - Update Ring synchron.vi ‏21 KB
Update Ring synchron1.vi ‏14 KB

How can I change the numeric and enum default values in a Strict Type Def Cluster?

I have a Strict Type Def cluster that contains 10 Numerical controls and a number of enums. I have edited default values of the numerical controls in the Strict Type Def, in customize mode, performed a "Make Current Values Default" and have done a "Apply Changes" and saved.
This cluster is used in various locations throughout the project and have not found a way to make the cluster default values change downstream. The Strict Type Def (STD) Control appears to have the right values on the front panel. But if I place an instance of this on a blank front panel, and run a wire from it in the block diagram with a probe and indicator, I still get the old default values being passed from the STD.
Solved!
Go to Solution.

There Are No Strict Type Definition Constants
"Even though typedefs only update when types change, instances get cosmetic changes from the definition whenever they update. So one trick to "push" changes to typedef instances is to change the data type, apply changes, and then change the data type back. [edit, March 26 - Note that the typedef instances need to be in memory when you use this trick]."
From Eyes on VIs, here.
http://blog.eyesonvis.com/
I love this article.
Jim
You're entirely bonkers. But I'll tell you a secret. All the best people are. ~ Alice

How to change the font color in a strict type def programatically

Could someone suggest a way to change the font color of a string indicator in a strict type def cluster programmatically? The cluster contains a label that is color-coded to match the function of the data channel represented by that cluster. The function of each channel is not predetermined, so the font color needs to be changed programmatically. To represent all channels, I have arranged a large cluster that contains 100 instances of the control. This makes it essential that the control be strictly type defined in order to change the layout of the clusters uniformly.
Can anyone suggest either a method by which I can let the control remain a strict type def and change the font color, or a method by which I can programmatically change the control from a strict type def to a type def? Currently, I am saving the control as a strict type def every time I make a change and then saving it again as a type def when I am ready to run the program. This works fine, but just seems inelegant. This color-coding is used throughout the program in various indicators, so a neat solution would be greatly appreciated.

As mentioned in my Nugget on Type definitions you can create strict type-defs that contain type-defs.
If you make your data definition a type and put that definition in a strict type-def (one of each flavor) you can use the appropraite strict type where each is required.
Yes the data structure will have another level of nesting so if you are "too far gone" you may not like this idea.
Otherwise you can write a VI that opens the typed-def and do a "save as..." and use it everytime you edit the type-def.
I hope something helps!
Ben
Message Edited by Ben on 10-06-2008 10:26 AM
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
Attachments:
Strict_of_Typedefs.PNG ‏30 KB

Array of strings strict type def not updating

I have defined an Array of Strings (ctrl) as a strict type def. When I update this array (add another string to it) the values don't update where this control is used. Can someone please explain why this is occuring.

Only the size of the array _shell_ is locked, not the size of the array data. The array shell is a window into the data of the array control. If you change the value of the index display you will change the indices visible inside the array shell.
-Jim

About Strict Type def

Hii
i have created a cluster of ring control as a strict type def.Also i have used a constant of that cluster in my program where i need.Now am changing the items in that ring control by opening the strict type def.I am giving Apply changes , save and all.Now the cluster in my program is changed.But my constant remains unchanged.;..How can i update a constant...

The wonders of searching (and that's just one of the results for my simple search).
Try to take over the world!

Error #1034 Type Coercion fail with registerClassAlias and nested Vectors

I'm attempting to use flash.net.registerClassAlias and ByteArray.writeObject in order to serialize/deserialize data with static type information. It works as you'd expect in the general case but I've run into problems with some nested Vectors that I don't understand. Hopefully someone can point out if I'm just missing something.
For what I understand, we must register both the scalar types and a one-deep specification of a Vector for that scalar type in order to use nested Vectors. For example:
            flash.net.registerClassAlias("TestStructureInner", TestStructureInner);
            flash.net.registerClassAlias("VectorTestInner", Vector.<TestStructureInner> as Class);
This should allow us to read/write objects of type TestStructureInner, Vector.<TestStructureInner>, and Vector.<Vector.<TestStructureInner>> into ByteArrays. And in general it seems to work.
Attached though is a simplified test case that fails, however. The first time we deserialize the data it works. The subsequent time, however, we encounter the following runtime error #1034.
    TypeError: Error #1034: Type Coercion failed: cannot convert __AS3__.vec::Vector.<Object>@304fcb9 to __AS3__.vec.Vector.<__AS3__.vec::Vector.<Test0.as$30::TestStructureInner>>.
    TypeError: Error #1034: Type Coercion failed: cannot convert __AS3__.vec::Vector.<Object>@304fbc9 to __AS3__.vec.Vector.<__AS3__.vec::Vector.<Test0.as$30::TestStructureInner>>.
    TypeError: Error #1034: Type Coercion failed: cannot convert __AS3__.vec::Vector.<Object>@304fdd1 to __AS3__.vec.Vector.<__AS3__.vec::Vector.<Test0.as$30::TestStructureInner>>.
    TypeError: Error #1034: Type Coercion failed: cannot convert __AS3__.vec::Vector.<Object>@304fce1 to __AS3__.vec.Vector.<__AS3__.vec::Vector.<Test0.as$30::TestStructureInner>>.
    TypeError: Error #1034: Type Coercion failed: cannot convert __AS3__.vec::Vector.<Object>@304fbf1 to __AS3__.vec.Vector.<__AS3__.vec::Vector.<Test0.as$30::TestStructureInner>>.
    TypeError: Error #1034: Type Coercion failed: cannot convert __AS3__.vec::Vector.<Object>@304fec1 to __AS3__.vec.Vector.<__AS3__.vec::Vector.<Test0.as$30::TestStructureInner>>.
    TypeError: Error #1034: Type Coercion failed: cannot convert __AS3__.vec::Vector.<Object>@304fad9 to __AS3__.vec.Vector.<__AS3__.vec::Vector.<Test0.as$30::TestStructureInner>>.
    TypeError: Error #1034: Type Coercion failed: cannot convert __AS3__.vec::Vector.<Object>@304fa61 to __AS3__.vec.Vector.<__AS3__.vec::Vector.<Test0.as$30::TestStructureInner>>.
    TypeError: Error #1034: Type Coercion failed: cannot convert __AS3__.vec::Vector.<Object>@304f9e9 to __AS3__.vec.Vector.<__AS3__.vec::Vector.<Test0.as$30::TestStructureInner>>.
    TypeError: Error #1034: Type Coercion failed: cannot convert __AS3__.vec::Vector.<Object>@304f971 to __AS3__.vec.Vector.<__AS3__.vec::Vector.<Test0.as$30::TestStructureInner>>.
Re-registering the class aliases again via flash.net.registerClassAlias works in this test case but isn't 100% for our actual application (I'm reticent to even mention it but it seems relevant). Is there a step I'm missing here? Any light shed would be appreciated.
// mxmlc -debug Test0.as
package
    import Base64; // http://code.google.com/p/jpauclair-blog/source/browse/trunk/Experiment/Base64/src/Base64.a s
    import flash.net.registerClassAlias;
    import flash.events.Event;
    import flash.utils.ByteArray;
    import flash.display.Sprite;
    import flash.display.Stage;
    import flash.system.System;
    public class Test0 extends Sprite
        static private const OPERATION_SERIALIZE:uint = 0;
        static private const OPERATION_DESERIALIZE_AND_FAIL:uint = 1;
        static private const OPERATION_DESERIALIZE_AND_SUCCEED:uint = 2;
        static private var staticStage:Stage;
        private var bar:Vector.<TestStructure>;
* common functions
        static private function registerClassAliases():void
            flash.net.registerClassAlias("TestStructureInner", TestStructureInner);
            flash.net.registerClassAlias("VectorTestInner", Vector.<TestStructureInner> as Class);
            flash.net.registerClassAlias("TestStructure", TestStructure);
        static public function staticDeserialize():Object
            var byteArray:ByteArray = Base64.decode("EBUAG1Rlc3RTdHJ1Y3R1cmUKEwAHZm9vEAEAH1ZlY3RvclRlc3RJbm5lcgoBEAEABAoBEAEABA oBEAEABAoBEAEABAoBEAEABAoBEAEABAoBEAEABAoBEAEABAoBEAEABA==");
            byteArray.position = 0;
            return byteArray.readObject();
        public function Test0():void
            registerClassAliases();
            // Switching operation between the constants demonstrates failure/success in a couple of different ways.
            // SERIALIZE is just used to prepare the base64 string for subsequent tests.
            var operation:int = OPERATION_SERIALIZE_AND_FAIL;
            if (operation == OPERATION_SERIALIZE)
                trace("Serializing");
                // outputs base64 string for subsequent tests
                serialize();
            else if (operation == OPERATION_DESERIALIZE_AND_FAIL)
                trace("Fail case");
                // perform successful one deserialization, then one failing one.
                deserializeOnceThenFail();
            else if (operation == OPERATION_DESERIALIZE_AND_SUCCEED)
                trace("Success via re-registration");
                // perform successful one deserialization, then another successful one.
                deserializeOnceThenSucceed();
* serialize
        // outputs base64 string we use for subsequent tests.
        private function serialize():void
            var baz:Vector.<TestStructure> = new Vector.<TestStructure>;
            for (var i:int=0; i<10; ++i)
                baz.push(new TestStructure);
            var byteArray:ByteArray = new ByteArray;
            byteArray.writeObject(baz);
            trace(Base64.encode(byteArray));
* deserializeOnceThenFail
        // perform successful one deserialization, then one failing one.
        public function deserializeOnceThenFail():void
            // save stage
            staticStage = stage;
            // the first deserialize will proceed without error.
            staticDeserialize();
            trace("Successful deserialize");
            // add an event listener in order to invoke error on subsequent frame
            stage.addEventListener(Event.ENTER_FRAME, doEnterFrameOnceThenFail);
        // remove event listener and invoke again.
        static private function doEnterFrameOnceThenFail(e:Event):void
            staticStage.removeEventListener(Event.ENTER_FRAME, doEnterFrameOnceThenFail);
            staticDeserialize();
            trace("unsuccessful deserialize2");
* deserializeOnceThenSucceed
* Here, we re-call flash.net.registerClassAlias on all our class types when running.
        // perform successful one deserialization, then one failing one.
        public function deserializeOnceThenSucceed():void
            // save stage
            staticStage = stage;
            // the first deserialize will proceed without error.
            staticDeserialize();
            trace("Successful deserialize");
            // add an event listener in order to invoke error on subsequent frame
            stage.addEventListener(Event.ENTER_FRAME, doEnterFrameOnceThenSucceed);
        // remove event listener and invoke again.
        static private function doEnterFrameOnceThenSucceed(e:Event):void
            staticStage.removeEventListener(Event.ENTER_FRAME, doEnterFrameOnceThenSucceed);
            registerClassAliases();
            staticDeserialize();
            trace("successful deserialize2");
internal class TestStructureInner
          public var value:int;
internal class TestStructure
          public var foo:Vector.<Vector.<TestStructureInner>> = new Vector.<Vector.<TestStructureInner>>;

The error would imply that ImageAssetEvent does not inherit
DisplayEvent. Either modify the inheritance chain or listen for a
basic Event object (flash.events.Event) and cast inside the
function.

Data is not updating in calss & Convert vi reference to strictly type reference vi

Hi,
In the attached project file there is a Class called 'ClassSample.lvclass' having 3 different data types Boolean, Numeric and Variant(not really sure, Variant can be use for strict data type reference). From this three we careated the 'VIs for data member access' you can see them in project file
My questions are,(Please refer attached screenshot)
1. Though member of same class, why value is not updating at probe 16 ?
2. How to convert vi reference to strictly type reference vi ?
Thank you.
Attachments:
Capture.JPG ‏426 KB
ClassSample Project.zip ‏116 KB

It depends a bit on your final intention. Bascially you have a shared state that you want to access asynchronously from different places. If you know that the actual object is only created once (terminilogie here is a bit shaky as every wire split would create a copy of the LVOOP object but I hope you know what I mean), you could use a global or Action Engine to store the state. Using a DVR for this state and adding the DVR to your object class data is however a more scalable approach as it will allow you to instantiate more than one object of that class and each one will contain its own DVR that will reference the same value for the specific object instance even if you split the object wire, creating actually two copies of that object (but for the purpose of this discussion they would be still the same object instance).
Queues could work if you create a single element queue but you would always need to use Preview Queue rather than Dequeue in order to maintain the value in there.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

How in CF8 I can identify type of cfinput/input???

Hello to all!!!
How in CF8 I can identify type of cfinput/input??? For
instance, I want to make some code for <input type="text"> or
I want to get all form fieldnames with exception "submit"
Thanks for your answers!!!!

vovasvv wrote:
> Hello to all!!!
> How in CF8 I can identify type of cfinput/input???
Where do you want to identify the form control types?
In the Client Browser you would use normal JavaScript to
examine the DOM
of the controls and look at the type properties.
On the server after a form is posted it does not matter. Form
data is
all name-value pairs and HTTP makes no distinction on what
type of from
control generated the name-value pair in the post|get data.
On the server while a template is building HTML content
containing a
form to be delivered to the Client. Then just examine the
page content
as it is being built or just before delivery.
Some help with the later functionality will be building your
HTML into
variables before delivery, accessing the underlining Java
pageContext
object and|or using onRequest() or onRequestEnd()
functionality of an
Application.cfc component to intercept the content before
delivery to
the web server.

Error #1034: Type Coercion failed: Error in FocusManager

Hi,
I am using ActionScript 3.0.
Here I want to setFocus on a DisplayObject(flash.display.DisplayObject).
I tried :
                    //var dispObject:DisplayObject;
                    //dispObject = code here to get displayObject;//valid DisplayObject got
                    var focusManager1:FocusManager = dispObject["focusManager"];
                    var component:IFocusManagerComponent = dispObject as IFocusManagerComponent;
                    if(focusManager1 != null && component != null)
                        focusManager1.setFocus(component);
But I am getting : Error #1034: Type Coercion failed: cannot convert mx.managers::FocusManager@3881e41 to mx.managers.FocusManager.
This is at line : var focusManager1:FocusManager = dispObject["focusManager"];
The same code would work if I use mx.core.UIComponent instead of DisplayObject, I guess.
But I am not able to convert DisplayObject to UIComponent (invalid cast).
Can someone please help me.
Thanks,
Pradeep.

mx.managers.FocusManager is for Flex Components and does not work with any other objects.
In order to set focus on an InteractiveObject (you cannot set focus on a DisplayObject which is not an InteractiveObject) use stage.focus.

Can strictly type refnum control do type coercion?

Similar Messages

Maybe you are looking for