底下一個範例程式，用GUIDE實現的，只有兩個按鈕，Tag各位自己看得出來。真正加入的程式碼不多，全部元件使用預設性質即可。

function varargout = Test_Interrupt_guidata(varargin)

% TEST_INTERRUPT_GUIDATA M-file for Test_Interrupt_guidata.fig

%      TEST_INTERRUPT_GUIDATA, by itself, creates a new TEST_INTERRUPT_GUIDATA or raises the existing

%      singleton*.

%

%      H = TEST_INTERRUPT_GUIDATA returns the handle to a new TEST_INTERRUPT_GUIDATA or the handle to

%      the existing singleton*.

%

%      TEST_INTERRUPT_GUIDATA('CALLBACK',hObject,eventData,handles,...) calls the local

%      function named CALLBACK in TEST_INTERRUPT_GUIDATA.M with the given input arguments.

%

%      TEST_INTERRUPT_GUIDATA('Property','Value',...) creates a new TEST_INTERRUPT_GUIDATA or raises the

%      existing singleton*.  Starting from the left, property value pairs are

%      applied to the GUI before Test_Interrupt_guidata_OpeningFcn gets called.  An

%      unrecognized property name or invalid value makes property application

%      stop.  All inputs are passed to Test_Interrupt_guidata_OpeningFcn via varargin.

%

%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one

%      instance to run (singleton)".

%

% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help Test_Interrupt_guidata

% Last Modified by GUIDE v2.5 24-May-2009 10:49:57

% Begin initialization code - DO NOT EDIT

gui_Singleton = 1;

gui_State = struct('gui_Name',       mfilename, ...

'gui_Singleton',  gui_Singleton, ...

'gui_OpeningFcn', @Test_Interrupt_guidata_OpeningFcn, ...

'gui_OutputFcn',  @Test_Interrupt_guidata_OutputFcn, ...

'gui_LayoutFcn',  [] , ...

'gui_Callback',   []);

if nargin && ischar(varargin{1})

gui_State.gui_Callback = str2func(varargin{1});

end

if nargout

[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});

else

gui_mainfcn(gui_State, varargin{:});

end

% End initialization code - DO NOT EDIT

% --- Executes just before Test_Interrupt_guidata is made visible.

function Test_Interrupt_guidata_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 Test_Interrupt_guidata (see VARARGIN)

global stopbit;  %只增加了stopbit的兩行

stopbit=1;

% Choose default command line output for Test_Interrupt_guidata

handles.output = hObject;

% Update handles structure

guidata(hObject, handles);

% UIWAIT makes Test_Interrupt_guidata wait for user response (see UIRESUME)

% uiwait(handles.figure1);

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

function varargout = Test_Interrupt_guidata_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)

% Get default command line output from handles structure

varargout{1} = handles.output;

% --- Executes on button press in pb_while.

function pb_while_Callback(hObject, eventdata, handles)

% hObject    handle to pb_while (see GCBO)

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

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

%第一個按鈕按下之後，一直跑一個while loop，直到stopbit被另一個按鈕改變

global stopbit;

countN=1;

while stopbit

disp(['Showing while loop, Count=' int2str(countN)]);

countN=countN+1;

pause(0.1);

end

disp('while loop interrupted by other callback function.');

disp('Reset stopbit =1');

stopbit=1;

%第二個按鈕的程序

% --- Executes on button press in pb_stop.

function pb_stop_Callback(hObject, eventdata, handles)

% hObject    handle to pb_stop (see GCBO)

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

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

global stopbit;

stopbit=0;

我試過用guidata更新handles的方式，沒用。我猜進入while loop後，handles已經被載入堆疊，在第一個按鈕的程序結束之前，它應該是看不到handles在外面被改過了。