Usefull-code/tran.cc at main · Hysware/Usefull-code · GitHub

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// tran.cc ---
//
// Description:
// Author: Hongyi Wu(吴鸿毅)
// Email: wuhongyi@qq.com
// Created: 日 6月  3 09:05:30 2018 (+0800)
// Last-Updated: 一 1月 17 19:46:53 2022 (+0800)
//           By: Hongyi Wu(吴鸿毅)
//     Update #: 4
// URL: http://wuhongyi.cn

void help()
{
 std:cout<<"root2m4b(const char *rootfilename,const char *m4bfilename)"<<std::endl;
}

void root2m4b(const char *rootfilename,const char *m4bfilename)
{
  TFile *file = new TFile(rootfilename,"READ");//"RECREATE" "READ"
  if(!file->IsOpen())
    {
      std::cout<<"Can't open root file"<<std::endl;
    }//const char *rootfilename,const char *m4bfilename；

  TH2I *matrix = (TH2I*)file->Get("mat_all_prompt");


  // write matrix file
  FILE *fp;
  if((fp=fopen(m4bfilename,"ab")) == NULL)
    std::cout<<"can't open file .m4b"<<std::endl;

  int count;
  for (int i = 1; i <= 4096; ++i)
    for (int j = 1; j <= 4096; ++j)
      {
    count = int(matrix->GetBinContent(i, j));
    fwrite(&count,sizeof(int),1,fp);
      }

  fclose(fp);

  file->Close();
}