IP address of host...

[Dheeraj Joshi]

Hi.. are there any exposed functions in c which gives IP address of host directly, like in java or c#???

If yen in which header file?

Regards
Dheeraj Joshi

[newb16]

It's os- and framework- dependent. There are no such functions in the standard.

[unauthorized]

There is a pretty standard way to do it through. getaddrinfo() in the berkley sockets API can get you the IP. Not ANSI C, but it works on Windows, 'nix, Mac and I bet a lot more systems.

[Dheeraj Joshi]

I got this program

#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#ifndef   NI_MAXHOST
#define   NI_MAXHOST 1025
#endif
 
int main(void)
{
    struct addrinfo * result;
    struct addrinfo * res;
    int error;
 
    error = getaddrinfo("www.google.com", NULL, NULL, &result);
    if (0 != error)
    {   
        fprintf(stderr, "error in getaddrinfo: %s\n", gai_strerror(error));
        return 1;
    }   
 
    for (res = result; res != NULL; res = res->ai_next)
    {   
        char hostname[NI_MAXHOST] = "";
        printf("%u\n",res->ai_addr);
        error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname,            NI_MAXHOST, NULL, 0, 0); 
        if (error != 0)
        {
            fprintf(stderr, "error in getnameinfo: %s\n", gai_strerror(error));
            continue;
        }
        if (*hostname)
        {
            printf("hostname: %s\n", hostname);
        }
     }   
    freeaddrinfo(result);
    return 0;
}
 

But unable to print the address in 10.50..... format..

And i am unable to get local host address also... Any inputs...

Regards
Dheeraj Joshi

[Banfa]

a. There is no point posting code and telling us "it didn't work". How didn't it work? Did it compile without errors and warnings? If it compiled did you get unexpected results when you ran it? If you got unexpected results what was the expect result? What was the unexpected result? What, if any, was the input data to the program? In the light of these questions "it didn't work" can be seen as a wholly inadequate description of your error.

b. If you took the time to understand the program you have run instead of just running it and complaining when it doesn't produce the data you require you would get futher. In particular I suggest you examine the structures being used by this program to see if they contain the data you are interested in. If they do then you can modify the program to print out those values instead.

[JosAH]

That's what people often do: they search the internet for pieces of code; they copy and paste it compile it and try to run it. Most of the time it doesn't even compile and if it does it doesn't run. Surprised they enter the forums and desperately ask around: "it doesn't run, help me, urgent, plz". If they finally are spoonfed with working code they end up with another piece of not understood code but, hey, it runs. They copy it further to the internet as answers to other people's questions.

ICT isn't a science anymore, it's like stamps collecting but now they collect code that they don't understand, but hey, it runs. And then they end up at the other end of the outsourcing pipe line and we get all that crap back. It's a shame.

kind regards,

Jos

[Dheeraj Joshi]

Thanks for the inputs :)

Regards
Dheeraj Joshi

[JosAH]

@dheerajjoshim
And now what? Are you going to try out other forums hoping they will spoonfeed you without criticism? Do you understand that snippet of code you posted or are you just hoping for the best? It won't automagically do what you have in mind.

kind regards,

Jos