in your case just use:
TApplication theApp("Toep", 0, 0);
However, better do this once and for all in the main() program. Also
never call
delete on an object (delete &theApp). The object will be destructed
automatically
when leaving the routine.
Cheers, Fons.
Maarten Bruinsma wrote:
>
> Thanks (dank je wel) for your very quick reply. What you mentioned could
> very well be the problem. I have created dummies for the command line
> argument, as I haven't got a clue what to put ther below you will
> find the routine in which I invoke the ROOT stuff
>
> void Track::Plot_On_Screen(CellInfo
> this_cel[NUMBER_OF_PLANES][NUMBER_OF_WIRES]) /* plot circles and line */
> {
> int a=0;
> char** p;
> TLine *this_line;
> TApplication theApp("Toep", &a, p);
> TCanvas *c = new TCanvas("Picture", "The Alignment Geometry", 400, 400);
> c->Show();
> TEllipse* these_ellipses = new TEllipse[nr_of_hits];
> for(a=0;a<nr_of_hits;a++)
> {
> these_ellipses[a]= TEllipse(hit[a].Z(), hit[a].Y(), hit[a].R(),
> hit[a].Error_R());
> these_ellipses[a].Draw();
> }
> this_line = new
> TLine(Z_0,0,this_cel[8][7].Z(),(this_cel[8][7].Z()-Z_0)*tan(1.570796-phi));
> /* max z zit bovenste mod. */
> this_line->Draw(); /* nog herschalen */
> c->Update();
> getchar();
> theApp.SetReturnFromRun();
> theApp.Run();
> delete &theApp;
> }
>
> the purpose is to plot a track on screen and apart from mentioned error
> will still need debugging probably.
>
> Thanks again and in advance.
>
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> * Maarten Bruinsma *
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-- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland Phone: +41 22 7679248 E-Mail: Fons.Rademakers@cern.ch Fax: +41 22 7822601