Interrupt a timer wait function

I have a function that runs through an undetermined amount of iterations in 5 second intervals, until a user clicks the "cancel" button to stop it. For this button, I'm currently using the 'waitbar' function, and creating a cancel button ('canceling') on it.

progress=waitbar(0,'1','Name','Logging Data...','CreateCancelBtn','setappdata(gcbf,''canceling'',1)');
setappdata(progress,'canceling',0);
looping=getappdata(progress,'canceling');n=1;

while looping==0
     n=n+1;
     t=timer('TimerFcn',@(~,~)waitbar(0,progress,n),'StartDelay',5);
     start(t)
     %Functions%
     wait(t);
     looping=getappdata(progress,'canceling');
end

delete(progress)

While this is technically working, the check for the cancel button happens after the 5 second delay. This means after clicking cancel, the popup will remain up until the delay ends.

My question is, is there some type of interrupt function that can be used to stop a timer immediately? Or any other type of function that would yield the same result?

Many thanks!

Answer 1

[Walter Roberson]

Do not create and start the timer every iteration and wait for it: create and start it once with an indefinite repeat. Have the cancel callback stop() the timer.