running a script in a function

fsw = System.IO.FileSystemWatcher();
fsw.Path = 'C:\Users\wolfgang';
fsw.Filter = 'test.csv';
fsw.EnableRaisingEvents = true;
listenerhandle = addlistener(fsw, 'Changed', @(~,~)testing1234(q,a));
%signature of importfcn is function importfcn(sender, eventargs)
%add a small delay in importfcn before reading the file as the event is raised
%to make sure that file modification is complete

I have saved the above code as the function systemwatch.

When I type in systemwatch manually in the command window then it gets executed without trouble. However, when I run this script systemwatch in another function then it does not get executed somehow. Can anyone explain this and tell me how to fix this please??

function if
 if  rowsOfMaxes<3 || rowsOfmin<3
     systemwatch;
 end

end

Basically, before i start the function, there is already an active listenerhandle and systemwatch running. The function has a condition and if the condition is met then I want certain parameters of the listenerhandle or systemwatch file to change.

I want this line

listenerhandle = addlistener(fsw, 'Changed', @(~,~)testing123(q,a));

to change to this

listenerhandle = addlistener(fsw, 'Changed', @(~,~)testing1234(q,a));

and I want this line

fsw.Filter = 'coke.csv';

to change to this

fsw.Filter = 'test.csv';

thanks

Answer 1

[Guillaume]

I would create the listener before enabling the FileSystemWatcher events.

Is this the exact code that is in the file systemwatch.m? Without any function prototype? If that is the case, then systemwatch.m is a script not a function. Possibly it doesn't work in a function because the listenerhandle goes out of scope.

Also shouldn't the code for listenerhandle be:

listenerhandle = addlistener(fsw, 'Changed', @(q,a) testing1234(q,a));

[AA]

so how can i resolve this problem?