[Dev-C++] i am lost (fstream)

[Jasin C. <tco...@st...>]

why doesn't this work like i want it to, i would just like to read and =
write to the same file but it just won't do it. but if i add this =
ios::trunc to the fstream it works just fine, the file is empty. I am =
tryin to load a text file with a list of ip's and port numbers and some =
other garbage. All i want is the ip and port numbers when finished. =
example looks like this.

example.
200.63.21.82:8080      anon.         220 bps  Argentina              =20

200.32.86.100:80       anon.         413 bps  Argentina
etc...

formatted look.
200.63.21.82:8080
200.32.86.100:80
etc...    =20

#include <iostream>
#include <fstream>
#include <string>
#include <ios>

using namespace std;

int main(int argc, char* argv[])
{
 string str;
 string str2;
 string garbage;
=20
 if(argc < 2)
 {
  cerr << "Usage: proxysort inputfile" << endl;      // see if program =
was called right
  return -1;
 }

 fstream file1(argv[1], ios::in|ios::out);

 /* loop through the entire file
 and finding just the ip,port info
 deleting the rest of the line until \n=20
 */

 while(file1.good())
 {
  file1 >> str;
  getline(file1, garbage);                  // ignore the rest of the =
line
  file1 << str << endl;
 }

 file1.close();

 return (0);
}