Key press counter not updating

I wish to count the total number of times a button is pressed.Actually was working on coin recognition system and when a button is pressed I want to calculate its key Press numbers, if button press >1 so that I may able to flush the screen (clear the screen) to load the image again for other operation . I tried to do so but counter is not updated . best regards.

Answer 1

[Jan]

function counter_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;

handles.counter = 0;  % Store the counter persistently in the handles struct

guidata(hObject, handles); 
end

% Get default command line output from handles structure
varargout{1} = handles.output;
% No, not here: counter =0;
end

function pushbutton1_Callback(hObject, ~, handles)
% No, do not reset the counter at each button press: counter=0;

handles = guidata(hObject);

% This is nonsense:
% if(counter>1)
%    disp(lallaala);
% end
handles.counter = handles.counter + 1;  % Access the variable inside the handles struct

guidata(hObject, handles);
% sum(length(counter));  ???
disp(handles.counter)
end

By the way: sum(length(counter)), counter is a scalar, then its length is 1 in every case. The sum of the length is 1 also.

[Ayesha Abbasi]

Thank you sir it works... :)

Answer 2

[Dennis]

Do you want to press a button or a key on your keyboard? It is both easy to achieve, but not clear to me which one you want. Your main problem is that you need to store counter, else it will indeed not get updated.

function pushbutton1_Callback(hObject, ~, handles)
counter=0;

handles=guidata(hObject);
try
counter=handles.counter;
end
if(counter>1)
    disp('lallaala');
end
     counter = counter+1;
handles.counter=counter;
guidata(hObject,handles);
sum(length(counter));  %counter is a scalar, this will always return 1
disp(counter)

end