MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Bedienungsanleitung PDF herunterladen (Seite 218)

9 Managing Application-Defined Data

9-6

1 Use getappdata to retrieve the structure.

From the example in the previous topic, the name of the application data

structure is

mydata. It is associated with the figure whose Tag is figure1.

Since the

handles structure is passed to every callback, the code can specify

the figure’s handle as

handles.figure1.

function mygui_pushbutton1(hObject, eventdata, handles)

matrices = getappdata(handles.figure1,'mydata');

2 Create a new field and assign it a value. For example

matrices.randn_50 = randn(50);

adds the field randn_50 to the matrices structure and sets it to a 50-by-50

matrix of normally distributed random numbers.

3 Use setappdata to save the data. This example uses setappdata to save the

matrices structure as the application data structure mydata.

setappdata(hObject,'mydata',matrices);

UserData Property

All GUI components, including menus, and the figure have a UserData

property. You can assign any valid MATLAB value to the

UserData property.

To retrieve the data, a callback must know the handle of the component with

which the data is associated.

1 In this example, an edit text stores the user-entered string in its UserData

property.

function mygui_edittext1(hObject, eventdata, handles)

mystring = get(hObject,'String');

set(hObject,'UserData',mystring);

2 A push button retrieves the string from the edit text UserData property. The

callback uses the

handles structure and the edit text Tag property,

edittext1, to specify the edit text handle.

function mygui_pushbutton1(hObject, eventdata, handles)

string = get(handles.edittext1,'UserData');

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Bedienungsanleitung Seite 218