Invoking an event from another event

Question

Hi,
I'm kind of new to the event structure in LV 7. Can anyone tell me how to invoke another event from the other one. For example i have two events say "calculate" to do something and "popmessage" to pop-up a user defined message box. How do i trigger the popmesage event upon timing out?

Answer 1

Hello,
In order to invoke a new event from within an existing event, you need to use programmatically generated (or user) events.
To find more information on programming with events,
See the LabVIEW User's Guide
In LabVIEW, go to Help, Search the LabVIEW Bookshelf
Click the LabVIEW User Manual
Chapter 9 describes Event-Driven Programming.
Read the event-programming tutorials.
Go to http://www.ni.com and click on Support at the top.
In Option 3, enter keywords "events labview" (without quotes).
The first link should be Event-Driven Programming in LabVIEW and the
third should be Advanced Event Handling with LabVIEW 7 Express.
Look at example code in LabVIEW
In LabVIEW, go to Help, Find Examples.
On the Search tab, enter "events."
Open "Programmatically Fire Events" for an example of triggering a new event from within an existing event.
I have also attached a simple example showing how to use programmatic events to invoke a new event from within the current event. However, the new event will not be processed until the current event is finished.
Is your situation that the calculate event may take a long time and you'd like to pop up a message after a certain amount of time? If so, one solution is to have parallel event structures. In the second structure, only process the user event. However, a simpler solution may be to check the clock before your processing loop and com
pare this value periodically in the loop to see if a certain amount of time has elapsed.
Happy coding,
Grant M.
National Instruments
Attachments:
Programmatic_Event.vi ‏40 KB