How can pause/stop/resume/run Matlab gui code?

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amir nemat
amir nemat on 7 Aug 2017
I have developed a code for run/pause the code which is palying a song and plotting a figure. However, inside my while 1, the result of button4 is not update. Where is my fault?
function pushbutton1_Callback(hObject, eventdata, handles)
set(handles.pushbutton4, 'userdata', 1);
while 1
a= get(handles.pushbutton4, 'userdata')
if a==0
disp('break');
break;
else
disp('inside loop');
end
end
function pushbutton4_Callback(hObject, eventdata, handles)
if get(handles.pushbutton4,'userdata')==1
set(handles.pushbutton4,'userdata',0);
else
set(handles.pushbutton4,'userdata',1);
end
  2 Comments
Hassan Bosha
Hassan Bosha on 17 Feb 2019
What is the user data ?
should it be written like this ?
function Resume_Callback(hObject, eventdata, handles)
handles.Resume.UserData = ~handles.Resume.UserData;

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Answers (3)

Jan
Jan on 7 Aug 2017
Edited: Jan on 9 Aug 2017
You cannot directly stop Matlab code by a GUI. Note that the callback of the GUI would be stopped also.
You can control the execution of a loop through a GUI, if you request e.g. the UserData of a certain button, which is toggled in its callback.
What is the actual problem you want to solve?
[EDITED] Give the figure a chance to update its properties by inserting drawnow:
while 1
drawnow;
a = get(handles.pushbutton4, 'userdata');
...


Akhilesh Thakur
Akhilesh Thakur on 8 Aug 2017
function pushbutton1_Callback(hObject, eventdata, handles)
set(handles.pushbutton4, 'userdata', 1);
This set(handles.pushbutton4, 'userdata', 1); is wrong. Because you are writing handles.pushbutton4 in the callback of pushbutton1. You are missing guidata(hObject,handles) in your pushbutton4 callback. This will update your handles structure and it will work.
  6 Comments
Image Analyst
Image Analyst on 9 Aug 2017
Isn't the UserData a property of the button and thus stored in the handles structure along with all the other properties of the button? And if you change handles, like a field of it or adding a new field, those changes are local and vanish once the function exists unless you call guidata, or pass handles out as a return argument if the function is a custom function rather than a callback function of a control.
And I thought drawnow just repaints the screen which will just show the same screen unless some property of the control which is visible had been changed.

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