MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelská příručka stáhnout pdf (Strana 437)

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Access Workspace Variables from a List Box (GUIDE)

To just inspect the GUI in GUIDE and run it, follow these steps instead:

1 ClickheretoaddtheexamplefilestotheMATLABpath(onlyforthe

current session).

2 Clickheretorunthelb GUI.

3 ClickheretodisplaytheGUIintheGUIDELayoutEditor(readonly).

4 ClickheretodisplaytheGUIcodefileintheMATLABEditor(readonly).

Note Do not save GUI files to the examp les folder where you found them

or you will overwrite the original files. If you want to save G U I files, use

File > Save as from G UIDE, which saves both the GUI FIG-file and the

GUI code file.

Read Workspace Variables

When the GUI initializes, it needs to query the w orkspace variables and s et

the list box

String property to display these variable names. Adding the

following subfunction to the GUI code accomplishes this using

evalin to

execute the

who commandinthebaseworkspace.Thewho command returns a

cell array of strings, which are used to populate the list box.

function update _lis tbox(handles)

vars = evalin('base','who');

set(handles.listbox1,'String',vars)

The function’s input argument is the handles structure set up by the GUIDE.

This structure contains the handle of the list box, as well as the handles of all

other components in the GUI.

The callback for the Up date Listbox push button also calls

update_listbox.

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