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Problems with programming simple timer in Tcl

Posted by Dimon (Dimon), 16 August 2006
Hello gentlmen
I happen in trouble with programming a simple timer in Tcl.
The task is next. It's needed to start timer, for example 10 seconds. The script must do something every second until timer is counting and stopping any actions when time is over.
I try to use  after command:
Code:
set isOver 0  ;# timer variable
set x 0          ;# counter variable

after 10000 { set isOver 1 }  ;# start timer
while {!$isOver} {                 ;# do something
 incr x
 after 1000
 puts "$x, $isOver"
}
unset isOver


but timer variable named isOver don't setted after expected delay and the 'while' cycle is endless.

How to solve this problem?

Posted by admin (Graham Ellis), 19 August 2006
Add in an update to give your rimed even a look in .... try

Code:
set isOver 0  ;# timer variable
set x 0     ;# counter variable

after 10000 { set isOver 1 }  ;# start timer
while {!$isOver} {       ;# do something
 incr x
 after 1000
 puts "$x, $isOver"
 update
}
unset isOver



Posted by iamxiaop (iamxiaop), 31 July 2007
Yes, the Update works here. but what 's the funcition of "update"? what other usage does update has?
Thanks.

Posted by admin (Graham Ellis), 31 July 2007
The other one that I recall is update idletasks in Tk.



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