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hObject error in execution of a checkbox

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Vicky S
Vicky S on 12 Apr 2019
Commented: Vicky S on 12 Apr 2019
I have been trying to execute the below mentioned code and encounter the below mentioned error
function checkbox()
handles.cbh = zeros(40,1);
handles.label = 1:40;
for k = 1:40
handles.cbh(k) = uicontrol('Style','checkbox','String',handles.label(k), ...
'Value',0,'Position',[30 20*k 130 20], ...
'Parent', hObject, ...
'Callback',{@checkBoxCallback,k});
end
guidata(hObject,handles);
function checkBoxCallback(hObject,~,checkBoxId)
handles = guidata(handles);
value = get(hObject,'Value');
if value
switch checkBoxId
case 1
fprintf('handle cb 1\n');
case 2
fprintf('handle cb 2\n');
otherwise
fprintf('do nothing\n');
end
end
end
end
the error is
Undefined function or variable 'hObject'.
Error in checkbox (line 5)
handles.cbh(k) = uicontrol('Style','checkbox','String',handles.label(k), ...

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Accepted Answer

Dennis
Dennis on 12 Apr 2019
Your checkbox function does not know 'hObject':
function checkbox()
handles.fig=figure;
handles.cbh = zeros(40,1);
handles.label = 1:40;
for k = 1:40
handles.cbh(k) = uicontrol('Style','checkbox','String',handles.label(k), ...
'Value',0,'Position',[30 20*k 130 20], ...
'Parent', handles.fig, ...
'Callback',{@checkBoxCallback,k});
end
guidata(handles.fig,handles);
function checkBoxCallback(hObject,~,checkBoxId)
handles = guidata(hObject);
value = get(hObject,'Value');
if value
switch checkBoxId
case 1
fprintf('handle cb 1\n');
case 2
fprintf('handle cb 2\n');
otherwise
fprintf('do nothing\n');
end
end
end
end

  1 Comment

Vicky S
Vicky S on 12 Apr 2019
thank you so much. It works.

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