MATLAB: List of user-managed object types

MATLABmatlab objects

Some objects in MATLAB (e.g., timer and graphic objects) are "user managed" and require special delete functions to get rid of. Nick Haddad talked about this on Loren's blog a while back.

http://blogs.mathworks.com/loren/2008/07/29/understanding-object-cleanup/

That blog post provides some rules for determining if an object is user-managed. Is there a list of all user-managed objects?

Best Answer

I believe that the list of user managed objects in the blog was complete. For MATLAB with no toolboxes the list is:

serial objects
timer objects
all handle graphics objects
file handles (IDs).

Many toolboxes have other objects that fit this model. It is not likely that new classes of objects that are added to MATLAB or toolboxes will follow the user managed model. All of these objects were in MATLAB before the introduction of handle objects and any changes to them would introduce incompatibilities.

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doc ancestor

MATLAB: Deleting Timer Objects containing in Objects’ properties

See if my code to kill all timers works for you:

%--------------------------------------------------------------------------------------------------------------------------
function StopTimer(handles)
try
  fprintf('Entering StopTimer...\n');
  listOfTimers = timerfindall % List all timers, just for info.
  % Get handle to the one timer that we should have.
  if isempty(listOfTimers)
    % Exit if there is no timer to turn off.
    fprintf('There are no timers to turn off. Leaving StopTimer().\n');
    return;
  end
  handleToTimer = getappdata(handles.figMainWindow, 'timerObj');
  % Stop that timer.
  stop(handleToTimer);
  % Delete all timers from memory.
  listOfTimers = timerfindall
  if ~isempty(listOfTimers)
    delete(listOfTimers(:));
  end
  fprintf('Left StopTimer and turned off all timers.\n');
catch ME
  errorMessage = sprintf('Error in StopTimer().\nThe error reported by MATLAB is:\n\n%s', ME.message);
  fprintf('%s\n', errorMessage);
  uiwait(warndlg(errorMessage));
end
return; % from btnStopTimer_Callback

Best Answer

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