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

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

Answer 1

[David Sanchez]

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

[Lucky]

thank you so much for the help!

Answer 2

[David Sanchez]

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

[Iain]

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]

thank you!! will try this option as well!

Answer 3

[Lucky]

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

[Iain]

 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".