MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Instrukcja Użytkownika Pobierz pdf (Strona 189)

Initialization Callbacks

8-17

• handles.output = hObject adds a new element, output, to the handles

structure and assigns it the value of the input argument

hObject, which is

the handle of the figure, i.e., the handle of the GUI. This handle is used later

by the output function. For more information about the output function, see

“Output Function” on page 8-17.

•

guidata(hObject,handles) saves the handles structure. You must use

guidata to save any changes that you make to the handles structure. It is

not sufficient just to set the value of a

handles field. See “The Handles

Structure” on page 8-13 and “GUI Data” on page 9-2 or more information.

•

uiwait(handles.mygui), initially commented out, blocks GUI execution

until

uiresume is called or the GUI is deleted. Note that uiwait allows the

user access to other MATLAB windows. Remove the comment symbol for this

statement if you want the GUI to be blocking when it opens.

Output Function

The output function returns, to the command line, outputs that are generated

during its execution. It is executed when the opening function returns control

and before control returns to the command line. This means that you must

generate the outputs in the opening function, or call

uiwait in the opening

function to pause its execution while other callbacks generate outputs.

• “Function Naming and Template” on page 8-17

• “Input Arguments” on page 8-18

• “Output Arguments” on page 8-18

Function Naming and Template

GUIDE names the output function by appending _OutputFcn to the name of

the M-file. This is an example of an output function template as it might appear

in the

mygui M-file.

% --- Outputs from this function are returned to the command line.

function varargout = mygui_OutputFcn(hObject, eventdata,...

handles)

% varargout cell array for returning output args (see VARARGOUT);

% hObject handle to figure

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Instrukcja Użytkownika Strona 189