Difficolta` leggere dati da un file dati

Salve a tutti .. sto cercando di leggere dei dati da un file contenente delle linee di testo in cui e` nascosta la dimensione delle righe del blocco da leggere ... per capirci meglio qui ho incollato il file : http://dpaste.com/19HQY5

il programma che ho scritto per ora e` questo :

# include <iostream>
# include <fstream>
# include <iomanip>
# include <string>
# include <sstream>
# include <cstdlib>
# include <cmath>
# include <vector>
# include <exception>
# include <algorithm>
# include <cstring>


//----------------------------------------------------------------------------------------


using namespace std;


//--- Function prototipes 


string readInput(int args, char* argv[],string& , string&);


void readData(vector<vector<vector<double>>>*, string& , int&);




//---


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


  string time,root ;    
  string filename = "stangle.000000000.dat" ;  
  int N;    


  cout << "Processing  "  << filename << "  ...."  << endl;
  
  vector<vector<vector<double>>>* ptrData ;
  vector<vector<vector<double>>> TableData;


  
  //cout << "ok" << endl ; 
  
  ptrData = new vector<vector<vector<double>>>(10); 
     
  readData(ptrData, filename, N);


  int k=0;
  cout << "--------------------" << endl;
  //ptrData.resize(k) 
  //    for(int i ; i < N ; i++ ){


  //    }
 /*           
  cout << N << endl ;
  for(int i=0; i< N; i++ ){
      for(int j=0; j<3 ; j++){
      cout << ptrData->at(k).at(i).at(j)  << ' ' ;
      }
      cout << endl ;   
  }
  */
  //    
      return 0;
}


//
//------


void readData( vector<vector<vector<double>>>* data,  string& file, int& size){
      unsigned int header = 3;
      string tmp, row ;


      ifstream inputFile;
      
      cout << file << endl;
      try
      {
            inputFile.open(file, ios::in);
      }
      catch(...) 
      {
            cerr << "Error occurred opening file " << file << " program terminate!" << endl;
            exit(1);
      }
      
      int indx=0;
      vector<vector<vector<double>>> *vPtr ;
      //vector<vector<vector<double>>> * 
      //data = new vector<vector<vector<double>>>(10); 
    int k=0;
    int w=0;      
    getline(inputFile,row);
    istringstream elem(row);
    while(elem >> tmp); 




//    if(k==0)http://dpaste.com/19HQY58
   while(!inputFile.eof() && k<=1){    
      while( w++ <= header-1 && getline(inputFile,row)){ 
            istringstream elem(row);
            if(w == header ){
                  while(elem >> tmp){
                             if(strcmp(tmp.c_str(),"I=" )== 0){
                               elem >> tmp ; 
                               size = atoi(tmp.c_str());
                             }
                  }
           }
     }
         cout << "size = " << size << endl;
      //cout << size << endl;
      //k=0;
      data->resize(size*3) ;
      data->at(k).resize(size*3) ;
      


      for(int i=0; i<size; i++)                // resize vector ! 
                  data->at(k)[i].resize(3) ;
      
      int j=0;
      while(getline(inputFile,row) && j < size){
            istringstream elem(row);
            for(int i=0; i < 3; i++)
                  elem >> data->at(k)[j].at(i); 
            elem >> tmp ;                    // 4th columns to skip
            j++;
      }
      
      //vPtr->at(indx) = data;
      
      for(int i=0; i < size ; i++ )
         cout << data->at(k).at(i).at(0) << ' ' << data->at(k).at(i).at(1) << ' ' << data->at(k).at(i).at(2) << endl ;
      
      k++ ;
   }
}

non riesco a catturare correttamente la stringa "I=" che precede la size del file