MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guide de l'utilisateur télécharger pdf (Page 664)

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14 Manage Ca llback Executio n

delete the timer before your GUI closes. To start a timer, call its st art

method. The tim er executes its StartF cn, begins counting, and executes its

first

TimerFcn callback when the period specified by the S tartDelay property

expires. To halt a timer, call its

stop method.

Caution Timers are independent objects that operate asynchronously, as

do GUIs. A timer callback can change or even delete data used by your GUI

code or code it calls. It can also fail t o execute due to timing out. If such

possibilities exist fo r your application, y ou r code must g uard against them.

For example, it can test whether a variable continues to exist, or place code

that can fail w ithin try-catch blocks

For an example of a GUI that uses a tim er, se e “Time Data Updates from a

GUI (GUIDE)” on page 10-105. For more information about setting up timers

and controlling their run-time characteristics, see “Using a MATLAB Timer

Object” and the

timer reference page.

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