Get FrontPanel Control references via ActiveX

Hi,
I've tried to get references to frontpanel controls via LabVIEW ActiveX server, equivalent to this LabVIEW code:
but I cant find the ActiveX methods / propertis to use. Is there a way to do this?
/LeifS
Solved!
Go to Solution.

The ActiveX Automation Server interface to the LabVIEW VI server only exposes a very small subset to the actual LabVIEW VI server. Basically it is enough to load and execute particular VIs and pass values to front panel controls by their label name, but that is it.
The reason is twofold. When VI Server was introduced in LabVIEW around LabVIEW 5.0 this was mostly the functionality that VI server exposed altogether. There was no scripting at all, and only limited access to the object hierarchy of the frontpanel controls. Even then the ActiveX interface did not expose all methds and properties of the VI server, partly because exposure of LabVIEW internas would have required an extensive ActiveX typelibrary, partly because it was not considered a main concern to be able to do more than launching VIs through it. It was better than the DDE interface already by a long stretch.
VI server was then extended enormously in later releases, but the ActiveX interface was not really changed much, also because Microsoft had announced .Net and declared the ActiveX hype of a few years earlier to be deprecated anyways.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Get All Controls References

Hi all
If somebody know how can i get all controls references of VI (including controls that founds in Tabs and Clusters). I need generic method, because i haven't information about VI (reference to VI i get only at run-time).
Thanks, Nadav

To include the controls on Tabs, pass the array from my previous answer into a for loop, use auto-indexing. Place a Class Specifier Constant in the loop, right click on it and set it's type to a Tab Control. Place a "To More Specific Class" function below the constant, and wire the constant into the top.
If the control from the array that you pass in is a Tab Control, "To More Specific Class" will NOT return an error. Use a case statement and use the No Error case to expose the Tab Control properties. Return the "Pages" property (an array) and pass this into a for loop. Connect a property node to the indexed pages, then select Controls On Page to return an array of controls ON EACH PAGE. You need to set up a shift register and use build array to return all of the controls from all of the pages. Make sure you close the Page Reference. You can concatenate the array of Tab Control Page items with your original FP Controls.
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How to get any control reference?

Hi everyone,
I want to get any control's reference when click the mouse button on any control.(Front Panel includes hundreds of different types of control.) Actually, I found method using "register for event:mouse down value source". This solution is fine working.
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Himmet GENCER
Software Development Coordinator at Teknik Destek Grubu
[email protected]
Attachments:
getControlReference.vi ‏12 KB

Using a couple of property nodes, you can get an array of references for all of the controls on a front panel. From there, just register the array.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
Attachments:
All Controls Mouse Down.png ‏8 KB

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Hello, I have made a lot of efforts to create and print an HTML Report.
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Did you look in the LabVIEW Help? http://zone.ni.com/reference/en-XX/help/371361G-01/lvhowto/reg_hndl_ax_evnts/
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Navigate Callback Example.vi ‏24 KB
Navigate Callback.vi ‏15 KB
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Gpib GET command using the GPIB ActiveX Control

Is there a way to trigger multiple instruments via the gpib 'GET' command using the GPIB activeX control for Visual Basic?

Hello,
I'm a bit confused as to what GET command you are trying to use. Where is this command located? Also, what are you trying to accomplish through use of this function?
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Getting control references which are in tabs

Hello,
In a labview vi, we can successfully get all the control references, including references to tab controls. We would also like to get at the control references of controls which are contained within the tabs. We've been hunting around the methods/properties of the vi pane references (where we found the controls[]) reference, and can't seem to find how to access the control references within tabs. Does anyone know the method/property to do this?
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The Pages property will return a 1D array of references to each page. Then you can autoindex this to get the controls for each page reference:

Controlling Properties via Reference

I have a cluster of numeric controls. I would like to control the properties (Disabled, Visible, Value, NumText.Format and NumText.Precision) of these individual controls by passing one reference from the cluster on the main vi, to a sub vi.
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Using this array of references I find property options available for Disabled, Visible and Value properties, among others. There are no options, however, for controlling NumText.Format and NumText.Precision.
Any suggestions, or perhaps there another way to approach this?
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Jim Haas
Solved!
Go to Solution.

The array of control references will be of a generic class, and therefore cannot have specific propertiies set. To gain access to the specific control properties you must cast to a more specific class first. If all the controls are of the same type, you can simply cast them all, using the "to more specific type", to numeric types. This should make the NumText properties available for setting.
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How to get the menu reference of a control while runtime

Hello...
i want to disable the control's short-cut menu programmatically. i could do it by using the event structure and 'shortcut menu activation' event.
this is why i am asking about getting the menu reference if individual control.
is there any other way out without using event structure?

"Share_Good" <[email protected]> wrote in message
news:[email protected]..
> Hello... i want to disable the control's short-cut menu
programmatically. i could do it by using the event structure and 'shortcut
menu activation' event. this is why i am asking about getting the menu
reference if individual control.  is there any other way out without
using event structure?  
No. You have to use the event. But if you simply disgard the activation, you
don't need to change it's run time menu. You'll need the event structure
anyway to catch the selected menu item.
Regards,
Wiebe.

How do get an indicator to appear when using control references

Hi, can anyone help with the following?
I've just managed to resolve the problem of getting indicators of a sub VI to appear on the front panel of my main VI and remain active. This was done by using control references. Basically, I created a reference for the control on the front panel of the main VI. I then dragged the reference in the block diagram of the main VI to the front panel of the subVI to obtain a Control Refnum. Then in the block diagram of the subVI I created a property node and linked the indicator and control refnum to it. Then I wired the subVI's connector pane to the control refnums in the subVi front panel. Finally, I copied the subVI icon into the mainVI block diagram
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[email protected]

I would suggest to use a customized boolean instead of making it visible/invisible, just take a boolean, change boolean text from TRUE/FALSE to YES/NO and change also diferent cases colors, this way, you don't need to play with property nodes. If this can't be done for any reason, using a local / global variable is the only solution that comes to my mind.
Hope this helps

Recupérer les valeur d'un Control via un .obj appelé depuis une DLL- Getting a Control value from an .obj file called from a dll

Bonjour,
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Autrement, il m'est impossible de faire parvenir à la dll les valeur des control ( dll qui appelle le .obj).
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Merci
Hi,
When using the LoadExternalModule function in CVI 2013, we can no longer use a .c file. Instead we have to use an .obj file.
My issue is that' impossible for me to get a control value from an .iur managed by the .obj witchi is called by a dll.
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For people who could be interested in, here the code I provided to the customer. This code demonstrates that calling a function defined in a .obj file from a DLL which is called itself by a program can be realized without throwing any error.
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3) Build the DLL (CTRL+M)
4) Define "Main" as Active Project
5) Click on "Debug Project" in order to build the executable and run it
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National Instruments France
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Attachments:
main.zip ‏70 KB

Problem calling java from vb via activex bridge

I am trying to call java from vb via ActiveX Bridge and I am running into problems. I would appreciate any help.
I am using Visual Basic 2010 express, and Java JDK 1.6.0_16. I have used the http://download.oracle.com/javase/1.4.2/docs/guide/beans/axbridge/developerguide/index.html page as a guideline. To try to make it work I took the following steps:
1. Wrote a very simple java class (below):
package xxx;
import java.io.Serializable;
public class axb implements Serializable {
public int get_axb_Handle() {
int Address = 12345678;
return Address;
2. After I compiled, and created the jar file. I built the dll using the following command:
"C:\Program Files\Java\jdk1.6.0_16\bin\packager" -out "C:\Program Files\Java\jdk1.6.0_16\jre\axbridge\bin" E:\axb\dist\axb.jar xxx.axb
3. I then registered using: regsvr32 axb.dll
4. In Visual Basic Express IDE I use Project -> Add Reference to add Iterop.axb (dump below), and axb namespace
5. In my basic code I use the following lines
Dim axb1 As axb.axb
axb1 = New axb.axb <== Crash here with AccessViolationException ( full exception below)
What am I missing? Any help would be greatly appreciated
Thanks
Iterop.axb partial dump
___[MOD] C:\Documents and Settings\Elie A. Cohen.USINC022\My Documents\Visual Studio 2010\Projects\Repo API Example\Repo API Example\obj\x86\Release\Interop.axb.dll
| M A N I F E S T
|___[NSP] axb
| |___[INT] axb.axb
| | | .class interface public abstract auto ansi import /*02000006*/
| | | implements axb.axbDispatch/*02000003*/
| | | implements axb.axbSource_Event/*02000005*/
| | | .custom /*0C000018:0A000001*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.GuidAttribute/*01000002*/::.ctor(string) /* 0A000001 */ = ( 01 00 24 34 45 36 44 30 44 41 38 2D 36 41 45 44 // ..$4E6D0DA8-6AED ...
| | | .custom /*0C000019:0A000007*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.CoClassAttribute/*01000009*/::.ctor(class [mscorlib/*23000001*/]System.Type/*01000007*/) /* 0A000007 */ = ( 01 00 0C 61 78 62 2E 61 78 62 43 6C 61 73 73 00 // ...axb.axbClass. ...
| |
| |___[CLS] axb.axbClass
| | | .class public auto ansi import /*02000004*/
| | | implements axb.axbDispatch/*02000003*/
| | | implements axb.axb/*02000006*/
| | | implements axb.axbSource_Event/*02000005*/
| | | .custom /*0C00000F:0A000008*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.ClassInterfaceAttribute/*0100000A*/::.ctor(int16) /* 0A000008 */ = ( 01 00 00 00 00 00 ) ...
| | | .custom /*0C000010:0A000009*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.ComSourceInterfacesAttribute/*0100000B*/::.ctor(string) /* 0A000009 */ = ( 01 00 0F 61 78 62 2E 61 78 62 53 6F 75 72 63 65 // ...axb.axbSource ...
| | | .custom /*0C000011:0A000001*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.GuidAttribute/*01000002*/::.ctor(string) /* 0A000001 */ = ( 01 00 24 43 44 42 46 36 42 33 33 2D 45 32 33 46 // ..$CDBF6B33-E23F ...
| | | .custom /*0C000012:0A000002*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.TypeLibTypeAttribute/*01000003*/::.ctor(int16) /* 0A000002 */ = ( 01 00 02 00 00 00 ) ...
| | |___[MET] method .ctor : void()
| | |___[MET] method equals : bool(object)
| | |___[MET] method getClass : object()
| | |___[MET] method get_axb_Handle : int32()
| | |___[MET] method hashCode : int32()
| | |___[MET] method notify : void()
| | |___[MET] method notifyAll : void()
| | |___[MET] method toString : string()
| | |___[MET] method wait : object(object,object)
AccessViolationException exception
System.AccessViolationException was unhandled
Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Source=mscorlib
StackTrace:
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache)
at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache)
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.Activator.CreateInstance(Type type)
at WindowsApplication1.Form1.getPatientHandle_Click(Object sender, EventArgs e) in C:\Documents and Settings\Elie A. Cohen.USINC022\my documents\visual studio 2010\Projects\Repo API Example\Repo API Example\Repo API Example.vb:line 13
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationContext context)
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
at WindowsApplication1.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:

In case you haven't figured it out already... Or if anyone else is curious... Or for myself when I get old and forgetful...
h2. Object Creation
For starters, when you create an ActiveX object from within VB, use:
Set myObject = CreateObject("JavaObject.Bean")When I refer to JavaObject.Bean, I'm meaning the full object name + ".Bean". So, in your case, you should use:
Set myObject = CreateObject("xxx.axb.Bean")h2. Location
The .dll file must be located in the JRE that is used at the time of calling. Meaning, the .dll file must be placed under <jre_home>\axbridge\bin and registered there.
In your case:
DLL:
C:\Program Files\Java\jre6\axbridge\bin
Jar:
C:\Program Files\Java\jre6\axbridge\libh4. A Note:
The only supported JRE is a 32bit version as far as I know with regards to the ActiveX bridge. Just like the packager.exe can only be found in the 32bit JDK.
h2. Methods
h3. Object Types
ActiveX Bridge does not support passing literals or arrays. However, it does support passing java's primitive data types as Objects.
Simply meaning:
h4. Invalid:
public int get_axb_Handle() {
     int Address = 12345678;
     return Address;
}h4. Valid:
public Integer get_axb_Handle() {
     int Address = 12345678;
     return Address;
}On a normal circumstance, there's little difference between the two methods. However, in the second example, the JVM does a typecast from a literal data type to a object data type, resulting in a valid object to pass through to Visual Basic. Now, obviously there are multiple ways to do a proper change, new Integer(int) for example. It doesn't matter to me. At the end of the day, you have to pass an object.
As a side note, the same idea applies when receiving data from Visual Basic.
h4. Invalid:
public void set_axb_Handle(int newHandle) {
     int Address = newHandle;
}h4. Valid:
public void set_axb_Handle(Integer newHandle) {
     int Address =newHandle;

How to call a LV.exe from LV via ActiveX?

Hi all,
I need some kind of atomic task, e.g. some (short) instructions that cannot be aborted. Calling a DLL, wait some ms, calling it again... And even an Abort via VI server shall not abort this atomic task but finish it.
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Hi Lul
I create a small example to run an LV application an run it via ActiveX in LV 7.1.
To build the application I change:
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Attachments:
example.zip ‏45 KB

Controlling Matlab via TestStand COM Objects

I am attempting to control MATLAB via teststand activex com objects. I set up my module to use the matlab 7 automation server, and when I try to run the sequence, I get this error:
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No such interface supported
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It turns out this issue was a bug within Matlab itself. The correct registry keys were not being added for the Matlab ActiveX server with version 7.2. The bug report is located here. Once the correct registry keys were added there was no problem calling the Matlab ActiveX interface.
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Obtaining activex reference from activex container

I have a VI with an embedded MediaPlayer activex object inside an activex container. Additionally, I have a seperately run VI which I want to be able to control the MediaPlayer obejct in the first VI. These VIs are opened seperately, so I cannot pass information directly from one to another (i.e., I can't directly pass the MediaPlayer activex reference to the second VI directly). Therefore, the second VI obtains a reference to the activex container object by searching the first VI's controls and filtering by label. I can typecast the control reference to the level of activex container, but from there I have no way of obtaining a reference to the object embedded in it. Is there are way to do this? The "To more specific class" function does not accept activex references for typecasting, and the automation open does not accept activex container references. I've searched through the forums, and while there is plenty on activex references and containers, there doesn't seem to be anything that addresses my issue.

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Generating LabVIEW events via ActiveX

I have a Labview 2010 Vi compiled to an EXE with ActiveX server enabled.
The VI has a single control that is a latched boolean control that is used in an Event Handler.
When I toggle this control, remotely, via an ActiveX client, the control changes state, but does not generate an event. (non-signaled).
I can understand this behavior if the control was not a latched control, but I would have thought that the latched control would automatically generate an event, since it doesn't make a distinction between "value" and "value (signaled)".
Other than monitoring/polling the control status and when it changes using a Value (Signal) local variable, is there a way to generate an Event, in a LabVIEW EXE, via ActiveX? Or is there another, more appropriate way to accomplish this. I'm trying to remotely run an program from another program through an activeX interface. I suppose if every control had a unique message and I had a message handler loop, then I could just use the ActiveX control to insert the appropriate message into the Queue, but this is an existing application and would take a fair effort to set that up.

What if you tried dynamically registering the event? You could create a reference to the boolean and use the Register for Events VI. Then, wire this event into the dynamic event terminal of the event structure (right click the border and say "Show Dynamic Event Terminals"). I don't have an ActiveX program to call into LabVIEW with, so I'm not sure if this will be any different than what you're doing now, but it's something easy to try. Perhaps you could post you ActiveX code and LabVIEW code or a modified version of both illustrating what you're mentioning?

Get FrontPanel Control references via ActiveX

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