CODEWITHSUNDEEP
c++
Mahadeva
Mahadeva

Reputation: 1647

C++ Reading file with really long text

I have following C++ code that is supposed to read from this file . I want to capture the IP and PORT from the text file and write it into a file. I have done following code:

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main () {
  string line;
  ifstream myfile ("myfile.txt");
  if (myfile.is_open())
  {
    while ( getline (myfile,line) )
    {
        cout<<line;
        if(line.find("IP")){
            cout<<line;
        }
        if(line.find("PORT")){
            cout<<line;
        }
    }
    myfile.close();
  }

  else cout << "Unable to open file"; 

  return 0;
}

But I am not getting correct output. What am I doing wrong here? I want to get those IP and PORT values and write another text file with following contents.

{
"ip":"127.0.0.1",
"port":"9999"
}

What should I be doing to achieve that?

Upvotes: 0

Views: 199

Answers (1)

Mohit Jain
Mohit Jain

Reputation: 30489

It should be:

std::size_t loc = line.find("IP");
if(loc != std::string::npos) {
  cout << line.substr(loc);
}

Do similar for the port also.

std::string::find returns the location of first character offset where the string was found or std::string::npos if string is not found.

Upvotes: 1

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