MATLAB: Listening to events when Matlab GUI application is idle

eventguiMATLAB

Hi, I would appreciate a piece of advice. I have a GUI application. I am able to listen to events (answers from a geodetic instrument) when there is a process running in my application (e.g. measurement). But how to listen to events when the application is idle (no matlab activity currently active, no function running, no button pressed). Is there a function (to where write definition of listening to events) which is active when aplication window rises (program starts) and active until it is closed? Thanks for help Filip

Best Answer

An alternative might be to

create a handle class, which creates the listener in the constructor

In startup.m

create an instance
put a copy of the handle somewhere, e.g. setappdata(0,'my_name',h)

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MATLAB: Run pushbutton automatically as soon as the GUI is visible without pressing the pushbutton

In the OpenFcn callback, create a timer object configured for a single execution, and have the callback for the timer object be a call to the name of the callback for the pushbutton, passing in the handle of the pushbutton, then [], and then the handles variable. But do it like this:

handles.push_timer = timer(... various arguments ...);
guidata(hObject, handles);   %store a copy of handles complete with the push_timer
handles.push_timer.TimerFcn = @(hObject, event) YourGUI_pushbutton1_Callback(handles.pushbutton1, [], handles);
start(handles.push_timer)

That is, do not set the TimerFcn callback to refer to handles until after you have already stored the timer object in handles. The timer() function permits you to configure TimerFcn as an option at the time you create the timer, but do not do that. If you do that, then the value of handles that makes it into the callback will not include the timer object and you would risk the timer being deleted before it gets used.

MATLAB: How to limit the scope of a listener created by using ADDLISTENER in MATLAB 8.0(R2012b)

A listener handle created using addlistener is tied to the object that is the source of the event. For eg.,

lh = addlistener(Hsource,'EventName',callback)

Here, the lifecycle of lh is same as the lifecycle of Hsource.

You can still control its scope by using the DELETE command as follows:

delete(lh)

Alternatively you can use event.listener, in this case the listener handle is not tied to the source of the event. Therefore, it does not exist outside the scope of its definition. Thus, no events outside the function will trigger this listener.

Best Answer

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MATLAB: Run pushbutton automatically as soon as the GUI is visible without pressing the pushbutton

MATLAB: How to limit the scope of a listener created by using ADDLISTENER in MATLAB 8.0(R2012b)

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