Causing an event in one VI when called from another

Hi All
I wonder if anyone could give me some advice on this. I have a VI, which displays the value of a text control, as a ‘value change’ event using an indicator. If I run this, having checked the ‘update will typing’ parameter for the control, the VI runs as expected and the indicator displays what I type. If I call the VI by reference from another and pass a string to the text control using the Set Control Value [Variant] method, the indicator remains blank, even though I can see the text control is being updated. I’m guessing this is because the event structure is expecting a user generated event which is no longer occurring. Is there any way to re-configure the code so that a value passed in this way, would be seen as an event? I've tried to get some idea from the Labview examples but not being too familiar with the way events work, I'm struggling to make sense of it. (I’m using Labview 7.1)
Thanks
Bruce

knight2 wrote:
Thanks tbob & Christian.
Can I just check this? I need to create a new control or indicator in the main VI and create a reference to it. This would then be passed to the subvi and I’m assuming, wired to the Value (signaling) property? If not, where should it go? I'm not too clear on this bit.
That said, I currently call the subvi from main, by reference. This was because I needed the subvi front panel to be visible before sending text to it. As I’m not passing any values via the connector pane, can the control/indicator reference still be passed?
Thanks
Bruce
Yes, your first paragraph is correct. Pass the ref to the subvi and use Value(Sgnl) property node in the subvi. This causes an event for the control, and since it is a reference, the event gets carried to the source of the reference, which is in Main.
To pass control references (or any object) to a subvi that is called by reference, you can use the Call by Reference method as shown in the attached Main vi. This allows you to pass items into and out of the subvi called by reference. If you use the standard way and use GetControlValue and SetControlValue, I don't think you can cause an event in Main by changing a value in the subvi. If you use the method in my vi, you can use the Value(Sgnl) property in the subvi to cause an event in the Main vi. This is the only way I know how to send events from a subvi to the main.
Download the subvi first and put it in some directory. Then download the main and put it in the same directory as the subvi. Then when you open Main, it should find the subvi.
- tbob
Inventor of the WORM Global
Attachments:
MainVI_Ref.vi ‏14 KB
SubVI_Ref.vi ‏11 KB

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The problem of the change in the form not being comitted is that
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Changes to the UI often have to be comitted by SwingUtitlities.invokeLater()
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Open VI with the Property
Node and the Invoke
Node.). I am calling Excel as an application not as a library call unless I am mistaken, which I could certainly be. Are you thinking that once Excel is active through the Automation Open VI that a DLL call to set the application visible would work? I may be trying this already but in Excel through the use of the macro I call from LabView. It contains application.visible = True at the beginning before reading files and plotting data.
I may try sprinkling Property node with application->visible in various locations in the LabView diagram as I do update cells after the call to the plot macro. The puzzle for me is the blinking Excel icon in the task bar. This means active and running but not visible or something wrong as well. There are a few #VALUE cells if not all test in the system are run. Again not a problem in Excel 2007-WinXP-LV8.6
Thank you again one and all.

Environment.Exit hangs when called from an application domain exception handler

I've implemented a handler for exceptions not thrown in the main GUI thread of my C# WinForms application, as follows:
AppDomain.CurrentDomain.UnhandledException += OnUnhandledExceptionThrown;
This handler is called from a background thread. The last statement in this handler is a call to
Environment.Exit with the application exit code. However, the application hangs in this call. From within Visual Studio, it hangs and I'm unable to break the application; I have to use Task Manager to terminate Visual Studio. Environment.Exit
works fine when called from the unhandled exception handler for the GUI thread. Is there a better way to terminate the application in the context of an unhandled exception thrown by a background thread?

Are you just trying to avoid a crash? Environment.Exit can cause deadlocking if exiting in the wrong kind of scenario; if you're just trying to avoid a crash, use
GetCurrentProcess with
TerminateProcess to terminate your own process. It skips the notification phases that Environment.Exit uses which prevents the common deadlock scenarios.
WinSDK Support Team Blog: http://blogs.msdn.com/b/winsdk/

Stored Procedure Does Not Run Properly When Called From Portlet

We have a simple Java portlet that calls a PL/SQL stored procedure which we wrote. The stored procedure sends a large number of emails to users in our corporation using the "utl_smtp" package. The stored procedure returns a count of the emails back to the Java portlet when it's finished. This number is displayed in the portlet.
Our problem:
The stored procedure functions as expected when run from a PL/SQL block in SQL*Plus, and the Java portlet calls the procedure properly when sending out a smaller number of emails (Less than 200 usually). When we get into a higher number of emails the procedure hangs when called from the portlet, but it STILL functions properly from SQL*Plus. It does not return the number of emails sent
and the Java portlet is unable to return a SQLException. Also, we have noticed that emails are sent at a much slower pace from the stored procedure when it's called from the portlet.

Any Ideas?

My iphone 4 does not register calls made to it. if i make a call from another phone, i can hear it ringing, but it does not register on the iphone. also, i do not get any messages when this happens. then after a day or two it decides to start working.

My iphone 4 does not register calls made to it. if i make a call from another phone, i can hear it ringing, but it does not register on the iphone. also, i do not get any messages when this happens. then after a day or two it decides to start working.

Clean iPhone charging port with clean dry toothbrush. See if better. If still problem clean charging port again with toothbrush and small amount of Isopropyl Alcohol.

Causing an event in one VI when called from another

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