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
