Hi, I try to have a tree with some string members. According to the doc the "/C" is used for that. But it is not clear to me how exactly to use it. I have tried many variations around following code all without success: #include "TFile.h" #include "TTree.h" main(int argc, char **argv){ TFile hfile("htree.root","RECREATE","Test for char"); typedef struct { Float_t x,y,z; Char_t c[4]; Float_t t; } POINT; static POINT point; TTree *tree = new TTree("T","Bla"); tree->Branch("tree",&point,"x/F:y/F:z/F:c/C4:t/F"); for ( Int_t i=1; i<10; i++) { point.x = i; point.y = 5*i; point.z = 20*i; point.t = 100*i; sprintf(point.c,"bl%d",i); tree->Fill(); } tree->Print(); hfile.Write(); hfile.Close(); return 0; } Compiling it then Running it gives: isdcpc7:~/investigate 213> ./a.out ****************************************************************************** *Tree :T : Bla * *Entries : 9 : Total = 13113 bytes File Size = 0 * * : : Tree compression factor = 1.00 * ****************************************************************************** *Br 0 :tree : x/F:y/F:z/F:c/C4:t/F * *Entries : 9 : Total Size= 12883 bytes File Size = 0 * *Baskets : 0 : Basket Size= 32000 bytes Compression= 1.00 * *............................................................................* But then: isdcpc7:~/investigate 214> root ******************************************* * * * W E L C O M E to R O O T * * * * Version 3.04/02 5 March 2003 * * * * You are welcome to visit our Web site * * http://root.cern.ch * * * ******************************************* Compiled for linux with thread support. CINT/ROOT C/C++ Interpreter version 5.15.68, Dec 12 2002 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }. root [0] a = new TFile("htree.root") (class TFile*)0x875a220 root [1] T->Scan() ************************************************************************ * Row * x * y * z * c * t * ************************************************************************ * 0 * 1 * 5 * 20 * bl1 * 1.772e-41 * * 1 * 2 * 10 * 40 * bl2 * 1.808e-41 * * 2 * 3 * 15 * 60 * bl3 * 1.84e-41 * * 3 * 4 * 20 * 80 * bl4 * 1.880e-41 * * 4 * 5 * 25 * 100 * bl5 * 1.916e-41 * * 5 * 6 * 30 * 120 * bl6 * 1.952e-41 * * 6 * 7 * 35 * 140 * bl7 * 1.988e-41 * * 7 * 8 * 40 * 160 * bl8 * 2.02e-41 * * 8 * 9 * 45 * 180 * bl9 * 2.059e-41 * ************************************************************************ (Int_t)9 -- Nicolas Produit INTEGRAL Science Data Center Phone: +41 22 950 91 40 16, Chemin d'Ecogia Fax: +41 22 950 91 33 CH-1290 Versoix www: http://isdc.unige.ch/
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