Load KUN een linie fra en txt fil!

Kode 

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>

template<typename T>
bool FromString(T &Val, const std::string &s)
{
   std::stringstream ss(s);
   return ss >> Val;
}

class PersonClass
{
public:
   std::string FirstName, LastName;
   int Age;
};

std::ostream &operator << (std::ostream &os, const PersonClass &Person)
{
   os << Person.FirstName << ' ' << Person.LastName << ' ' << Person.Age;
   return os;
}

bool ReadPerson(std::istream &is, PersonClass &Person)
{
   std::string Line;
   if(std::getline(is, Line))
   {
      std::string::size_type Pos = Line.find('#');
      if(Pos != std::string::npos)
      {
         Person.FirstName = Line.substr(0, Pos);
         Line = Line.substr(Pos + 1);
         Pos = Line.find('#');
         if(Pos != std::string::npos)
         {
            Person.LastName = Line.substr(0, Pos);
            Line = Line.substr(Pos + 1);
            Pos = Line.find('#');
            if(Pos != std::string::npos)
            {
               FromString<int>(Person.Age, Line.substr(0, Pos));
               Line = Line.substr(Pos + 1);
               return true;
            }
         }
      }
   }
   return false;
}

int main()
{
   std::ifstream file("test.dat");
   if(!file)
   {
      std::cerr << "Failed to open test.dat" << std::endl;
      return 0;
   }
   PersonClass Person;
   while(ReadPerson(file, Person))
      std::cout << Person << std::endl;
}

Kode 

std::streampos FindPerson(std::istream &is, int FieldNr, const std::string &Value)
{
   is.clear();
   is.seekg(0, std::ios::beg);
   std::string Line;
   std::streampos FilePos = 0;
   while(std::getline(is, Line))
   {
      std::string::size_type Pos = 0;
      for(int i = 0; i < FieldNr && Pos != std::string::npos; i++)
      {
         Pos = Line.find('#');
         if(Pos != std::string::npos)
         {
            Pos++;
            Line = Line.substr(Pos);
         }
      }
      Pos = Line.find('#');
      Line = Line.substr(0, Pos);
      if(Line == Value)
         return FilePos;
   }
   return -1;
}

Kode 

   PersonClass Person;
   // Try to find Jensen
   std::streampos pos = FindPerson(file, 1, "Jensen");
   if(pos != -1)
   {  // Found
      file.clear();
      file.seekg(pos, std::ios::beg);
      ReadPerson(file, Person);
      std::cout << Person << std::endl;
   }