MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual do Utilizador descarregar pdf (Página 235)

List Box Directory Reader

10-11

• First input argument is not a directory, but is a character string and there is

more than one argument — execute the subfunction identified by the

argument (execute callback).

The following code listing show the setup section of the GUI M-file, which does

one the following:

• Sets the list box directory to the current directory, if no directory is specified.

• Changes the current directory, if a directory is specified.

function lbox2_OpeningFcn(hObject, eventdata, handles, varargin)

% This function has no output args, see OutputFcn.

% hObject handle to figure

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

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

% varargin command line arguments to untitled (see VARARGIN)

% Choose default command line output for lbox2

handles.output = hObject;

% Update handles structure

guidata(hObject, handles);

if nargin == 3,

initial_dir = pwd;

elseif nargin > 4

if strcmpi(varargin{1},'dir')

if exist(varargin{2},'dir')

initial_dir = varargin{2};

else

errordlg({'Input argument must be a valid',...

'directory'},'Input Argument Error!')

return

end

else

errordlg('Unrecognized input argument',...

'Input Argument Error!');

return;

end

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual do Utilizador Página 235