Problem Reading File in C++

Hi, I'm having trouble opening my file in visual studio. The fexists function returns true, but when gets to the loading in the file it gives me the following error: invalid NULL pointer. When debugging, it says error reading characters from string. The file in notepad looks like this: "1#2#3#4". Can anyone see a reason why this is occurring? Thanks!

Code:

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#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include<string>
using namespace std;


bool fexists(string filename)
{
  ifstream ifile(filename);
  return ifile;
}

int _tmain(int argc, _TCHAR* argv[])
{
       
        string location = "C:\\Users\\Brittany\\Documents\\Visual Studio 2012\\Projects\\ConsoleApplication9\\ConsoleApplication9\\Debug\\test1.txt";
        bool file_exists = fexists(location);
        ifstream my_file (location);
        int poundpos[12];
        string mystring;
       
\        int i = 0;
        string temp = 0;
        int add = 0;
        int temp1 = 0;
       
        int length = 20;
        while(getline(my_file, mystring))
        {
                //length = stoi(mystring.length);
                istringstream liness(mystring);
                for(i = 0; i < length; i++)
                {
              getline(liness, temp, '#');
                  temp1 = stoi(temp);
                  temp1 = poundpos[i];
                  add = poundpos[i] + add;
               
                }
        }

       
       
        cout << (add);
       
        my_file.close();
        return 0;
}

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Yes. In fexists, What type is ifile? what type are you returning from fexists? Where in your main program are you testing fexists return value?

Quote:

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Originally Posted by elephant1

... When debugging, it says error reading characters from string. The file in notepad looks like this: "1#2#3#4".

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In what line of your code do you have this error?

Could you explain what you are btrying to do ?

There are a number of problems:

Code:

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int poundpos[12];

// ...

int length = 20;

// ..

for(i = 0; i < length; i++)
{
  getline(liness, temp, '#');
  temp1 = stoi(temp);
  temp1 = poundpos[i];          // 1. what happens if i>11 ?
                                // 2. where does poundpos[i] ever get set ?
                                // 3. you set temp1 ... but overwrite it right away
  add = poundpos[i] + add;   
}

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