Hi,
happy new year to everybody !
I'm using root 3.02/06 cvs of December 23, 2001 on Linux/i386.
I run the following small macro:
{
f = new TFile("$ROOTSYS/tutorials/basic.root"); // generated by
$ROOTSYS/tutorials/basic.C
f->cd();
TSQLResult *query_res = ntuple->Query("x:x:x:x");
TSQLRow *row;
while (row = query_res->Next())
{
cerr << row->GetField(0) << ' ' << row->GetField(3) << endl;
delete row;
}
delete query_res;
}
where I get the following output:
-1.10227895 1.10227895
1.86717796 .86717796
-0.524181008 0.524181008
i.e.the second and later columns have the first character truncated.
Replacing in TTreeRow::GetField(Int_t field) the following line:
if (field > 0) return fRow +fFields[field-1]+1;
by
if (field > 0) return fRow +fFields[field-1];
and replacing in TTreeRow::SetRow(const Int_t *fields, const char *row)
Int_t nch = fields[fColumnCount-1]-1;
by
Int_t nch = fields[fColumnCount-1];
(the '\0' after the last field must be stored as well, otherwise
GetField(...)
for the last column returns an improperly terminated string)
seems to solve the problem (I guess the meaning of fFields[i]
is the sum of the lengths including the trailing '\0's of fields
0..i-1).
best regards,
Andre
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