gPad

From: Rutger van der Eijk (r36@nikhef.nl)
Date: Mon Feb 28 2000 - 12:24:41 MET


Hi,

When is gPad known in an interactive ROOT session? I know gPad became a
macro to improve thread support. However if I just start interactive ROOT,
gPad is not know until I draw some object. This is inconvenient because I,
e.g. want to check if a canvas is already present.

i.e. the macro 

  // create pad
  if (!gPad) {
    if (!gROOT->GetMakeDefCanvas()) return;
    (gROOT->GetMakeDefCanvas())();
  }
  gPad->Clear();


crashes with:

Error: No symbol gPad in current scope  FILE:/tmp/29646eaa_cint LINE:1


I probably missed a roottalk or release note about this (because more ppl
should have this), or am doing something stupid. Can anybody point me out
to the documentation? (Version   2.23/12   1 February 2000)

cheers,

Rutger



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