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dotted IP Address to unsigned char

Posted on 2008-10-17
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Last Modified: 2013-12-14
Hi

I need a piece of code to convest dotted IP address to an unsigned char array, example:
192.168.0.1
will be same as:
unsigned char the_ip[4] = {192, 168, 0, 1};

preferably I don't want to use std , pure C++ code is preferred

Please advice.

Thanks from now!
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Question by:CSecurity
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Expert Comment

by:Infinity08
ID: 22740097
The socket library contains a nice function for that : inet_pton :

        http://linux.die.net/man/3/inet_pton

called like this :
struct sockaddr_in sa;
inet_pton(AF_INET, "192.168.0.1", &(sa.sin_addr));
 
// now sa.sin_addr.s_addr contains a 32 bit value representing the IP address

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Accepted Solution

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Infinity08 earned 2000 total points
ID: 22740125
You can of course parse the IP address yourself if you really want to.

Here's one way :
const char *ip_addr = "192.168.0.1";
unsigned char ip[4] = { 0 };
if (4 != sscanf(ip_addr, "%u.%u.%u.%u", &(ip[0]), &(ip[1]), &(ip[2]), &(ip[3]))) {
  // error parsing the IP address !!
}

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Author Comment

by:CSecurity
ID: 22740133
Thanks... but I'm using VC++ 6 and I don't want to include that library... Any ideas?
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Author Closing Comment

by:CSecurity
ID: 31507103
Thanks
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Expert Comment

by:Infinity08
ID: 22741398
>> and I don't want to include that library

That is the socket library, and if you want to do socket programming, you'll need it anyway :)
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LVL 53

Expert Comment

by:Infinity08
ID: 22804108
The accepted code I posted earlier is not correct ... Do not use it ;)

Here's more info :

        http://www.experts-exchange.com/Programming/Languages/CPP/Q_23847222.html
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