Because LabVIEW is a graphical programming interface, its event handling is different from event handling in other programming languages. The following list provides instructions and suggestions for using events in LabVIEW applications.
Keywords：LabVIEW
Reference address：Notes and suggestions for using events in LabVIEW
- Avoid using event structures outside of loops.
- Remember to read the terminal of the trigger Boolean control in the Value Change event case.
- Use the Case structure to handle the undo operation of a triggered Boolean control.
- Use caution when configuring a conditional branch to handle actions for multiple notification events.
- Do not configure a branch to process multiple filter events with different event data.
- If a While Loop containing an Event structure terminates based on the value of a Triggered Stop Boolean control, remember to handle the Triggered Stop Boolean control in the Event structure.
- If you do not need to monitor specific front panel objects programmatically, consider using the Wait On Front Panel Activity function.
- UI events are only available for direct user interaction.
- Avoid using both dialog boxes and "mouse down?" filter events in the same event branch.
- Avoid placing two Event structures in a loop.
- When using dynamic registration, make sure each Event structure has a Register Events function.
- When you use a subpanel control, the top-level VI that contains the subpanel control handles the events.
- If you need to generate or handle other events while processing the current event, consider using the event callback registration function.
- Choose notification or filter events carefully. You use an event case to handle notification events and will not affect how LabVIEW handles user interactions. Use filter events to change whether or how LabVIEW handles user interactions.
- Do not use the Panel Close Notification event in critical shutdown code unless you take steps to ensure that the VI does not abort when the front panel closes. For example, make sure that the application opens a reference to the VI before the user closes the front panel. Alternatively, use the Panel Close? filter event, which occurs before the panel closes.
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