Flow of control in GUIs

Hi

My question is pretty rudimentary. I am unable to see the sequence in which the functions are being called in a GUI.

I realized that the OpeningFcn and the outputFcn are the first and last to be called. BUt the rest in between is very confusing.

What I want to do, is pass a path to a directory to save some data (from the main code to the GUI function) and allow the user to save the data is a push button is pressed. When I am passing it as an argument, it is stored in a variable called varargin in the GUI function. But by the time the code for the push button call back is called, the varargin variable is deleted on its own.

I am very confused about how to implement it.

[per isakson]

See tracer4m, tracer4m traces calls to methods and functions.

Answer 1

[Sara]

The callback functions are called when you interact with a component in the gui. So, for instance, when you click on the pushbutton, its callback is called (if you used GUIDE, the callback is created automatically). To "save" variables in a gui you have to put them in the handles variable, e.g.:

handles.my_var = my_var;

and then use the command:

guidata(hObject, handles);

at the end of the functions called by the components in the gui (e.g., in the callback of your pushbutton, the opening function).