[PTB] how to cancel running a function with a timer?

Hi,

I am trying to make a loop in MatLab Psychtoolbox that runs the GetClicks function for 2 seconds and then stops running it. But mu current function gets stuck in the GetClicks function. By getting stuck I mean that it won't leave the loop before a subject has clicked on the screen, but I would like to have the option to leave the loop also when subject has not clicked with a mouse. I also need o save the coordinates of the mouse click (these determine what answer the subject gave).

Any ideas how to solve it?

 tic;
      state=0;
      while state==0;
          time=toc;
          if time < 2 %subject should have 2seconds to reply
              [clicks,x,y] = GetClicks;
              if clicks==1
                  state=1;
              end
          elseif time> 2
              state=1;
              clicks=99;
          end
      end

Answer 1

[Walter Roberson]

Since you are working with PsychToolbox routines, you should really be checking with their mailing list or online resources.

It looks to me as if the answer might be

http://docs.psychtoolbox.org/GetClicks

global ptb_mouseclick_timeout;
old_timeout = ptb_mouseclick_timeout;
ptb_mouseclick_timeout = 2;
clicks = GetClicks([],0);
ptb_mouseclick_timeout = old_timeout;
state = clicks > 0;