Help with Reading files

[flavourofbru]

Hi,

I am storing the name of the text file in a string as
string fname = "abc.txt";
string l_mline;
vector<string> p_vFileIndices;

Then I am trying to read this text file into a vector as follows:

ifstream l_ifsFile(fname.c_str());

while (getline(l_ifsFile, l_mline, '\n'))
{
p_vFileIndices.push_back (l_mline);
}
cout << "Read " << p_vFileIndices.size() << " lines.\n";
for(int i =0; i < p_vFileIndices.size(); i++)
cout<<p_vFileIndices[i]<<endl;

But I see that the file is not read. It says read 0 lines.
Whats the problem in the code.
I am using VC++.

How to convert the read string in vectors to integers??

Please Help.
Thanks!!

[pntkiran]

Hi,

I am storing the name of the text file in a string as
string fname = "abc.txt";
string l_mline;
vector<string> p_vFileIndices;

Then I am trying to read this text file into a vector as follows:

ifstream l_ifsFile(fname.c_str());

while (getline(l_ifsFile, l_mline, '\n'))
{
p_vFileIndices.push_back (l_mline);
}
cout << "Read " << p_vFileIndices.size() << " lines.\n";
for(int i =0; i < p_vFileIndices.size(); i++)
cout<<p_vFileIndices[i]<<endl;

But I see that the file is not read. It says read 0 lines.
Whats the problem in the code.
I am using VC++.

How to convert the read string in vectors to integers??

Please Help.
Thanks!!

Hi flavourofbru,
You find your solution
here

Kiran Parmar

[flavourofbru]

Hi Kiran,

Thanks for the quick reply.
But I will be passing my text file "abc.txt" with different names.
What I am doing is, i am getting certain strings from a text file and then append that string to another one. so each time, I will be reading different text files, thats the reason why I am passing a string having the name of the text file as the file name to read. In that loop I am reading about 100 text files, so each will be of different text file name. So I am passing the name of the text file as string and want to see whether it reads the text files.

Is it possible to send a string as the name of the text file and read it. If so, can you please help me out.

Thanks,
Rishi

[weaknessforcats]

This code works fine with Visual Studio.NET 2005

#include <iostream>
using namespace std;
#include <vector>
#include <string>
#include <fstream>
int main()
{
string fname = "c:\\scratch\\instructor\\abc.txt";
string l_mline;
vector<string> p_vFileIndices;
 
//Then I am trying to read this text file into a vector as follows:
 
ifstream l_ifsFile(fname.c_str());
 
while (getline(l_ifsFile, l_mline, '\n'))
{
p_vFileIndices.push_back (l_mline);
}
cout << "Read " << p_vFileIndices.size() << " lines.\n";
for(unsigned int i =0; i < p_vFileIndices.size(); i++)
cout<<p_vFileIndices[i]<<endl;
} //end of main()
 

My abc.txt was:

12 23 45 65
89 34 9 43
95 32 65 39

To convert these to integers, use a stringstream

stringstream ss;
int inta, intb, intc, intd;
ss << p_vFileIndices[i];
ss >> inta >> intb >> intc >> intd;
 

[flavourofbru]

Thanks!!!
It has been of great help!!