c++ - read data from a file with multiple sections from VC++ in VS2013 -

i need read txt file vc++ in vs2013.

in file, there mutiple sections:

 #section1  head1,head2,head3  dcscsa, sdew, safce  .....  #section2  head1,head2,head3, head4,head5  112,633,788,632,235  ..... 

i need save lines different data structure section1: mapsection1>

  section12   mapsection2<string, map<string, int>> 

can use code :

 string aline;  getline(file, aline);  stringstream ss(aline);  int cnt = 0;  if (file.good())  {     while (!file.eof())     {         string substr;         getline(file, aline);         stringstream ss(aline);         while (ss.good())         {             // how save data different map different section?         } 

also, can load whole file data set , process each line or process each line when file read line line.

which 1 more efficient ?

thanks

can use code : ...

not quite.

use:

int sectionno = 0; while (getline(file, aline)) {     if (aline.empty()) continue;     if (aline[0] == '#')     {         ++sectionno;         getline(file, aline); // read headings... use them if         continue;     }     std::stringstream ss(aline);     switch (sectionno)     {       case 1:         if (ss >> >> b >> c >> std::skipws && ss.eof())             ... use a, b, c ...         else             throw std::runtime_error("invalid data in section 1 " + aline);         break;       case 2:         ...  } 

also, can load whole file data set , process each line or process each line when file read line line.

which 1 more efficient ?

almost latter.