If handles is unknown in the callback, provide it as input:
set(handles.time_caption,'String',datestr(now,13))
tmr = timer('Name','Reminder', ...
'Period',1, ... % Update the time every 1 seconds.
'StartDelay',0, ... % In seconds.
'TasksToExecute',inf, ... % number of times to update
'ExecutionMode','fixedSpacing', ...
'TimerFcn',{@updater_mg, handles}); % <== HERE
function updater_mg(TimerH, EventData, handles) % <== AND HERE
set(handles.time_caption , 'string' , datestr(now,13));
end
Add a security check:
function updater_mg(TimerH, EventData, handles) % <== AND HERE
if ishandle(handles.time_caption)
set(handles.time_caption , 'string' , datestr(now,13));
else
disp('Timer for clock stopped: GUI was closed');
stop(TimerH);
end
end
