Get info from string

[Mr Moe]

I'm looking to retrieve bits of information from a char string.

Basically I get a string with delimiters in a few spots, then I have to get the substrings between each of those delimiters.

For instance, I have a char string that gets an IP address such as "150.40.230.8". And what I have to do is extract the "150", "40", "230", and "8" in individual elements of a [4] element array of type int.

char ip_address[16] = "";

cout << "Enter an IP: ";
cin >> ip_address;

And I want to get those into an array called octet[4]. So in the end I want-
octet[0] = 150
octet[1] = 40
octet[2] = 230
octet[3] = 8

I was thinking of using the strtok() function, but wasn't sure exactly how to get it to work. Or perhaps the strchr() function in some way?

Maybe somehow I could get the position of the first ".", read the stuff before that into octet[0], then from that position find the position of the next "." and read in the stuff between those two positions into octet[1], and so on until I read the last octet where I read from the position of the last "." to the null terminator. Just not sure how the code would look for that.

Any ideas?

[andyhunter]

Take a look at this thread about strtok().

That should clear things up for you.

[Mr Moe]

Thanks, I think I got it to work, here is the code-

    char ip_address[16] = "";
    char *tokptr;
    int octet_count = 0;

    cout << "Enter an IP: ";
    cin >> ip_address;

    tokptr = strtok( ip_address , "." );
    while( tokptr != NULL )
    {
        octet[octet_count] =  atoi( tokptr );
        tokptr = strtok ( NULL , "." );
        octet_count++;
    };

[anonytmouse]

You may be interested in the inet_addr function.