TTree::GetEvent() not yet automatic

From: William J. Deninger (deninger@uiuc.edu)
Date: Thu Jan 01 1998 - 00:48:32 MET


Hello,

The ROOT header give the following description of TTree::GetEvent

 Int_t TTree::GetEvent(Int_t event, Int_t getall)
{
//*-*-*-*-*-*Read all branches of event and return total number of
bytes*-*-*
//*-*        ===========================================================
//     If event = 0 take current event number + 1
//     If event < 0 reset event number to 0
//     getall = 0 : get only active branches//     getall = 1 : get all
branches

   if (event < 0 || event > fEntries) return 0;
...
}

However, the following if doesn't allow event to be reset to zero when
event<0.
Also, using the default GetEvent() (which passes in event=0) doesn't appear
to increment the event making the following loop eternally closed.

{
tree = new TTree("tree","hi root fans");
while(tree.GetEvent())
    ProcessEvent();
}

If this has already been pointed out, please forgive me.  And thanks again
for all your help.

William Deninger
deninger@uiuc.edu



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