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combine two text files.

Posted on 2004-03-25
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Last Modified: 2010-04-01
hi
i want to insert text from one file to another existing text file(to the end of the second file),could someone help me? example is perfect!
thanks.

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Question by:shean85
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6 Comments
 
LVL 86

Accepted Solution

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jkr earned 150 total points
ID: 10681105
You'd use

ifstream is;
ofstream os;

is.open ( "infile.txt");
os.open ( "appendfile.txt", ios_base::ous | ios_base::app); // open as "append"

while (!is.eof ()) { // read from input file

    string s;
    getline ( is, s);
    os << s.c_str (); // append to output file
}

os.close ();
is.close ();
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LVL 39

Assisted Solution

by:itsmeandnobodyelse
itsmeandnobodyelse earned 150 total points
ID: 10692378
Some minor supplements to the sample of jkr:

1. Use  

#include <fstream>
using namespace std;

2. Change ios_base::ous --> ios_base::out  

3.    os << s.c_str () << endl; // append to output file and add a linefeed character

Regards, Alex

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LVL 8

Expert Comment

by:mnashadka
ID: 10695954
For a more C++ version, you can use iterator's and the copy algorithm:
#include <iostream>
#include <fstream>
#include <algorithm>

using namespace std;

void main(void)
{
  ifstream in("success.log"); // Open the input file
  in.unsetf(ios_base::skipws); // We want whitespace
  ofstream out("out.txt", ios_base::app | ios_base::out); // Open the output file
  copy(istream_iterator<char>(in), istream_iterator<char>(), ostream_iterator<char>(out)); // Copy the data from the ifstream to the ofstream
}
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LVL 49

Expert Comment

by:DanRollins
ID: 10711755
Do you want to append the contents of second file to the end of the first file?
Or do you want to insert the contents of the second file at some other location in the first file?

-- Dan
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