Cern ROOT—如何从TTree根文件中读取内容到数组中

I am trying to read data in from a Cern ROOT TTree file. I have not used root before and I am struggling a bit with this. I am familiar with C++, so can sort the array side of things, but I have been through several tutorial pages online and haven't got anywhere.I am trying to read data in from a Cern ROOT TT