Hi all,
1 - I derived class TChain to add this constructor, which can chain
several rootfiles in a single command :
Chain::Chain(const char* chainname, const char*
pattern) : TChain(chainname) {
string ls("ls ");
ls += pattern;
cout<<pattern<<endl;
FILE *in;
in = popen(ls.c_str(), "r");
char filename[100];
while(fscanf(in,"%s",filename) != EOF) {
cout<<filename<<" ... ";
TFile tmp(filename);
if( tmp.IsZombie() ) {
cerr<<"not a root file"<<endl;
continue;
}
if(tmp.ReadKeys() ) {
tmp.Close();
if(TChain::Add(filename)) cout<<"OK!"<<endl;
else cout<<"chainname not found"<<endl;
}
else
cout<<"No Keys !"<<endl;
}
pclose(in);
}
I think it could be useful to have something like that in the TChain
class.
2- You can notice in this piece of code that I'm opening the TFile to
check that there are keys inside before adding it to the chain. If one
tries to add a file with no keys, the chain is usable only for files added
before (one has to limit number of entries manually).
TChain::GetEntries() gives the error message :
Warning in <TFile::Init>: file chunk10001/28000/coral.root has no keys
Error in <TFile::cd>: Unknown directory CsEfficiency
Error in <Chain::LoadTree>: cannot find tree with name
/CsEfficiency/MM02V1___eTree_ in file chunk10001/28000/coral.root
this check should probably be done in TChain::Add somehow, is it possible
? Is there already a way to do this check in a better way ?
thanks,
Colin
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