MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual do Utilizador descarregar pdf (Página 216)

9 Managing Application-Defined Data

9-4

2 Use the following command to save the data.

guidata(hObject,handles)

where hObject is the handle of the component for which the callback was

triggered. It is passed automatically to every callback.

Changing GUI Data in an M-File Generated by GUIDE

In a GUIDE-generated M-file, GUI data is always represented by the handles

structure. This example updates the

handles structure and then saves it.

1 Assume that the handles structure contains an application-defined field

handles.when whose value is 'now'.

2 In a GUI callback, make the desired change to the handles structure. This

example changes the value of

handles.when to 'later', but does not save

the

handles structure.

handles.when = 'later';

3 Save the changed version of the handles structure with the command

guidata(hObject,handles)

where hObject, which is passed automatically to every callback, is the

handle of the component for which the callback was triggered. If you do not

save the

handles structure, the change you made to it in the preceding step

is lost.

Application Data

Application data provides a way for applications to save and retrieve data

associated with a specified object. For a GUI, this is usually the GUI figure but

can also be any component. The data is stored as name/value pairs. Application

data enables you to create what are essentially user-defined properties for an

object.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual do Utilizador Página 216