MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Spécifications télécharger pdf (Page 41)

Programming the GUI

2-19

Sharing Data Between Callbacks

This topic describes the process for sharing data between callbacks in a GUI.

Subsequent topics, “Adding Code to the Opening Function” on page 2-20 and

“Adding Code to the Callbacks” on page 2-22, contain examples.

You can share data between callbacks by storing the data in the MATLAB

handles structure. All components in a GUI share the same handles structure.

It is passed as an input argument to all callbacks generated by GUIDE.

For example, to store data contained in vector

X in the handles structure, you

1 Choose a name for the field of the handles structure where you want to store

the data, for example,

handles.my_data

2 Add the field to the handles structure and set it equal to X with the following

statement:

handles.my_data = X;

3 Save the handles structure with the guidata function:

guidata(hObject,handles)

Here, hObject is the handle to the component object that executes the callback.

The component’s object handle is passed as the input argument,

hObject, to

each of its callbacks that is generated by GUIDE.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Spécifications Page 41