How to make root file parse arguments from command line?

Newbie
1

Hello,

As someone who has been learning both C++ and ROOT at the same time, one of the issues I am having trouble with is figuring out how to implement a way to parse arguments from the command line into my main function. Currently, I have my main function where I want to open a ROOT file, it looks like this

int main(int argc, char* argv[]) {

  //Parse arguments

  std::unique_ptr<TFile> myFile{TFile::Open(filename, "UPDATE")};


  //TFile full(fileName);
  fileIterator(myFile);
  return 0;
  //RNTupleMover();

I would like a way to input a root file from the command line and get its name. Thank you!
ROOT Version: 6.34.04
Platform: Windows
Compiler: Not Provided

2

Hi Oswaldo,

This question is important but not really related to ROOT.
You can access the arguments at the command line as elements of the argv array, i.e. argv[0], argv[1], …
First hit on a popular web search engine: link

Cheers,
D

3

I recommend GitHub - CLIUtils/CLI11: CLI11 is a command line parser for C++11 and beyond that provides a rich feature set with a simple and intuitive interface.

It’s header-only, so no need to do much extra compilation.