ryan roth wrote:
>
> Hello all:
>
> Sorry about the previous message -- I had meant to cancel it and ended up
> sending it instead.
>
> My question was:
>
> If, within a program, I create a TCanvas object and retain a pointer to
> it, and then the user closes canvas window, what is the best way for the
> program to examine the pointer and find out that the canvas has been closed?
>
You can look for a canvas by its name in the list of canvases.
TCanvas *myCanvas =
(TCanvas*)gROOT->GetListOfCanvases()->FindObject("myCanvas");
if (myCanvas == 0) your canvas has been deleted.
Note that this technique can be applied to all named objects
for which gROOT has the corresponding container (see class TROOT).
Rene Brun
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