MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Instrukcja Użytkownika Pobierz pdf (Strona 259)

An Address Book Reader

10-35

& the second element is a MATLAB file, then load that file

elseif (length(varargin) == 2 && ...

strcmpi(varargin{1},'book') && ...

(2 == exist(varargin{2},'file')))

Check_And_Load(varargin{2},handles);

else

errordlg('File Not Found','File Load Error')

set(handles.Contact_Name,'String','')

set(handles.Contact_Phone,'String','')

end

Loading an Address Book Into the Reader

There are two ways in which an address book (i.e., a MAT-file) is loaded into

the GUI:

• When running the GUI, you can specify a MAT-file as an argument. If you

do not specify an argument, the GUI loads the default address book

(

addrbook.mat).

• The user can select

Open under the File menu to browse for other MAT-files.

Validating the MAT-file

To be a valid address book, the MAT-file must contain a structure called

Addresses that has two fields called Name and Phone. The Check_And_Load

subfunction validates and loads the data with the following steps:

• Loads (

load) the specified file or the default if none is specified.

• Determines if the MAT-file is a valid address book.

• Displays the data if it is valid. If it is not valid, displays an error dialog

(

errordlg).

• Returns

1 for valid MAT-files and 0 if invalid (used by the Open menu

callback)

• Saves the following items in the

handles structure:

- The name of the MAT-file

- The

Addresses structure

- An index pointer indicating which name and phone number are currently

displayed

1 2 ... 254 255 256 257 258 259 260 261 262 263 264 ... 329 330

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Instrukcja Użytkownika Strona 259