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
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