Run pushbutton callback only 3 times, after that display warning message

2013 6 5
3 个回答
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0 个投票

Hi! I am new in matlab, can you please help me with this question: While clicking on pushbutton callback it plays wav file. I want to limit number of clicks to max 3 times. When clicking 4th time get error message: warndlg({'Warning: You exceeded number of repetitions.';}); Should I use loops or what?? Thank you in advance!!!
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
if handles.status==1
handles.status=0;
play(handles.r);
end

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 采纳的回答

David Sanchez
David Sanchez 2013-6-5

0 个投票

in GUI initialization function:
global times_pushed
times_pushed = 0;
in your callback function:
global times_pushed
times_pushed = times_pushed + 1;
if times_pushed == 4
errordlg('your error message here');
times_pushed = 0;
end

更多回答（2 个）

David Sanchez
David Sanchez 2013-6-5

0 个投票

Define a global variable and initialize to 0 within initialization function:
global times_pushed
times_pushed = 0;
Within the callback function, increment the value of this variable each time the function is called ( the button in pushed )
timer_pushed = times_pushed + 1;
if times_pushed == 4
errordlg('your error message here');
times_pushed = 0;
end

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Iain
Iain 2013-6-5
Don't use globals if you can avoid them.
You can use "persistent" variables, if you only want one function to access it.
You can put a count of how many times it has been played into the "userdata" property of a graphics object and retrieve it with set and get
Lucky
Lucky 2013-6-5
thank you!! will try this option as well!

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Lucky
Lucky 2013-6-5

0 个投票

Thank you very much! But i still dont understand where should i put this: if handles.status==1 handles.status=0; play(handles.r); end
Should it be after initializing the variable?
global times_pushed
times_pushed = 0;
if handles.status==1
handles.status=0;
play(handles.r);
end
times_pushed = times_pushed + 1;
if times_pushed == 4
errordlg('your error message here');
times_pushed = 0;
end

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Iain
Iain 2013-6-5
set(h, 'Userdata', variable)
Takes the contents ot "variable", and puts it in the "userdata" property of the item referred to by "h".
v = get(h,'Userdata')
Retrives the contents of the userdata property of the item referred to by h, and puts it in the variable "v".

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