MATLAB: TimerFcn within GUI function to another GUI function

Question

I am attempting to call one gui function from a gui function in a gui script so that I can pass various handles around.

Essentially how the program works is: Checkbox to stream data.

    function Checkbox_Callback(hObjects,eventdata,handles)
    onoff = get(hObject,'Value');
    if onoff == 1
       a = timer;
       set(a,'executionMode','fixedRate','Period',1,'TimerFcn','Stream');
       start(a)
    elseif onoff == 0
       stop(a)
    end

The next function is used to call the data from an external program. The function definitely works, it's just the issue of how to call it correctly from the set(a,'TimerFcn',XXXXXXXXX);

The "Stream" function is along these lines:

function Stream(hObject,eventdata,handles)
XPNetConnect();
out = XPNetRecv();
variable1 = out.Variable1;
... etc
%Calculations
handles.Value = something;
guidata(hObject, handles);
Run_Another_Callback(hObject, eventdata, handles)

Hopefully you get the gist of what I'm trying to do.

I would really appreciate the help.

Thank you in advance.

Answer 1

I would do things a little differently ...

Make your timer object when you make your gui. If you do it at this point, all the handles that Stream needs are known.

You could do:

handles.htimer = timer('executionMode', 'fixedRate', 'Period', 1, 'TimerFcn', @(h, evt)Stream(h, evt, handles));

Note the specification of TimerFcn as

@(h, evt)Stream(h, evt, handles)

You would then rewrite Checkbox_Callback to be

    function Checkbox_Callback(hObject,eventdata,handles)
    if get(hObject,'Value')
       start(handles.htimer)
    else
       stop(handles.htimer)
    end