"files" on TFile

Mariusz Stanczak (MStanczak@sprintmail.com)
Mon, 06 Apr 1998 00:33:04 -0700

Hello,
If someone, please, could help me understand a couple of things;
first, after creating a directory on a .root file, how to actually put
a "file" in that directory (in a .C macro)?
Let me clarify... i have a time series data that lands itself nicely
to the idea of a directory structure, as follows;
root_file:/type/date/time <- this file would contain the data,
which consists of a mixture of strings and floats.
This seemed like the simplest way to pursue, but hours of reading
the HTML docs still wouldn't point me to a way to write out, be it as a
structure, or a class, the actual data.

So, for the time being, I ended up with a combination of directories
and TTree files, as follows;
root_file:/type/date <- TTree containing the rest of data
but with this scheme I've ran into a problem as well. I create the file
OK, but getting the data back eluded me so far. I can loop through
all the directories, all the trees and the branches in them, but things
either blow up when I try to read the leaves containing the actual data,
or I get incorrect values. I expected to get the data through TLeaf->
GetValuePointer(), but it doesn't seem to be so. What am I missing here?
This is all with a 2.03 version on NT.

Thanks in advance,

/Mariusz