You forgot to call the TROOT constructor. See examples of main programs in $ROOTSYS/test directory, for example hsimple.cxx Rene Brun Huaizhang Deng wrote: > > Hi: > > I wrote a program which uses the root library. When I run > the program in interactive session by using CINT, there is > no problem but slow. Therefore, I decided to compile it > and link it to the root library to get a executable file. > There is no problem to compile it. However, when I run the > executable file, I got the error message "Root system not > initialized" when the program tries to open a root file by > "TFile *f =new TFile(filename, "old");" . Do you know how > to solve this problem? I am using 2.23/08 version. > > Huaizhang
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