又是读了多个文件没关闭，搞死了一晚

上次matlab也是这样。dir读写文件没关闭，循环读。调了半天。

这次又来！原来写了44行，应改写在42行。再一次强调，看代码要十分耐心。

vector< vector<string> > readFileList::GetFileNameFromVideoDir()
{
    vector<string> vFileDirList_out;    
    vector< vector<string> > vFileDirList_all;
    DIR *dir;
    struct dirent *ptr;
    //get outer fold names
    dir = opendir(root_path.c_str());
  LOG(INFO)<<"wanggcong!!!******************************";
    while( (ptr = readdir(dir)) != NULL)
    {
        string filename = string(ptr->d_name);
        if (filename[0] == '.'){
            continue;
        }
        string path = root_path + string("/") + filename;
        vFileDirList_out.push_back(path);
    }
    closedir(dir);
    //according to outer folds names, we can get the videos from 
    //every fold one by one
  LOG(INFO)<<"wanggcong!!!*******************************";
    for (int i=0; i < vFileDirList_out.size(); ++i)
    {
        vector<string> vFileDirList_in;
        dir = opendir(vFileDirList_out[i].c_str());

        LOG(INFO)<<"wanggcong:name:"<<vFileDirList_out[i];
        LOG(INFO)<<"wanggcong:size:"<<vFileDirList_out.size();
          LOG(INFO)<<"wanggcong:dir:"<<dir;
  LOG(INFO)<<"wanggcong:ptr:"<<ptr;
        while( (ptr = readdir(dir)) != NULL)
        {
            string filename = string(ptr->d_name);
            if (filename[0] == '.'){
                continue;
            }
            string path = vFileDirList_out[i] + string("/") + filename;
            vFileDirList_in.push_back(path);
        }
        vFileDirList_all.push_back(vFileDirList_in);
        closedir(dir);
    }
   //  closedir(dir); 
  LOG(INFO)<<"wanggcong!!!*******************************";
  
    return vFileDirList_all;
}