Re: [ROOT] using TTimer

From: Fons Rademakers (Fons.Rademakers@cern.ch)
Date: Mon May 07 2001 - 18:47:43 MEST


How are you waiting to for the server? With a TMonitor?

--Fons


Ivan Storgaard Vogelius wrote:
> 
> Hmmm
>         I have a problem then:
> The programme waits on a line for a server to send a buffer, and while
> that happens it obviously doesnt come by the gSystem->ProcessEvents()
> lines, which means that I can interact with the canvas, but it is quite
> annoying with sometimes very long breaks. Any Idea to get around that?
>         Ivan
> 
> On Mon, 7 May 2001, Fons Rademakers wrote:
> 
> > Hi Ivan,
> >
> >   synchronous timers are only processed when the program processes
> > events via gSystem->ProcessEvents(). So in your case there is a
> > chicken and the egg problem. Best is just to regularly in your
> > canvas update loop to call gSystem->ProcessEvents() or if you
> > want it to be timer driven use an a-synch timer TProcessEventTimer
> > (via TSystem.h) and for its use check TTreePlayer.cxx (see:
> > http://root.cern.ch/lxr/source/treeplayer/src/TTreePlayer.cxx#1095)
> >
> >
> > Cheers, Fons.
> >
> >
> > Ivan Storgaard Vogelius wrote:
> > >
> > > Hi!
> > >         I want to create a TTimer to update interactions with canvas
> > > regularly. I tried to do the following:
> > >   TTimer *timer= new TTimer(500, kTRUE);
> > >   timer->SetCommand("gSystem->ProcessEvents()");
> > >   timer->TurnOn();
> > >
> > > But It causes the programme to crash(in CINT or compiled). How should it
> > > be done?
> > >
> > >         Thanks
> > >         Ivan
> >
> > --
> > Org:    CERN, European Laboratory for Particle Physics.
> > Mail:   1211 Geneve 23, Switzerland
> > E-Mail: Fons.Rademakers@cern.ch              Phone: +41 22 7679248
> > WWW:    http://root.cern.ch/~rdm/            Fax:   +41 22 7677910
> >

-- 
Org:    CERN, European Laboratory for Particle Physics.
Mail:   1211 Geneve 23, Switzerland
E-Mail: Fons.Rademakers@cern.ch              Phone: +41 22 7679248
WWW:    http://root.cern.ch/~rdm/            Fax:   +41 22 7677910



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