Hi,
Many thanks for your help.
> This requires a TApplication, but not a TApplication::Run
The clear message then is that IT IS REQUIRED to create a TApplication in
case one wants to get any graphics on the screen.
Thus, immediately before the line "new TCanvas(...)" I put :
if (!gApplication) new TApplication("Application", ((int *)0), ((char **)0));
and this seems to solve the problem (I mean, I get my canvas drawn).
There is one additional warning - it looks like certain root actions have
a side-effect of creating a batch-TApplication object, if the gApplication
is null. There doesn't seem to be any way to switch such an application
into a non-batch mode (at least "gROOT->SetBatch(kFALSE);" doesn't work at
all). And ... the "new TCanvas(...)" is one of such actions !!! Thus
... first "new TApplication(...)", and then "new TCanvas(...)". Never
opposite !!!
Best regards,
Jacek.
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