MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Dokumentacja Pobierz pdf (Strona 168)

5 Application Examples

5-44

% If called without any file then set file to the default file name.

% Otherwise if the file exists then load it.

if isempty(file)

file = 'addrbook.mat';

handles.LastFile = file;

guidata(handles.Address_Book,handles)

end

if exist(file) == 2

data = load(file);

end

% Validate the MAT-file

% The file is valid if the variable is called "Addresses" and it has

% fileds called "Name" and "Phone"

flds = fieldnames(data);

if (length(flds) == 1) & (strcmp(flds{1},'Addresses'))

fields = fieldnames(data.Addresses);

if (length(fields) == 2) &(strcmp(fields{1},'Name')) &

(strcmp(fields{2},'Phone'))

pass = 1;

end

% If the file is valid, display it

if pass

% Add Addresses to the handles structure

handles.Addresses = data.Addresses;

guidata(handles.Address_Book,handles)

% Display the first entry

set(handles.Contact_Name,'String',data.Addresses(1).Name)

set(handles.Contact_Phone,'String',data.Addresses(1).Phone)

% Set the index pointer to 1 and save handles

handles.Index = 1;

guidata(handles.Address_Book,handles)

else

errordlg('Not a valid Address Book','Address Book Error')

end

The Open Menu Callback

The address book GUI contains a File menu that has an Open submenu for

loading address book MAT-files. When selected,

Open displays a dialog

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Dokumentacja Strona 168