gethostbyaddr Help Plz

This is a discussion on gethostbyaddr Help Plz within the Windows Programming forums, part of the Platform Specific Boards category; Hi, Can someone give me an example of using gethostbyaddr to convert and IP to a hostname then display it ...

  1. #1
    Registered User (TNT)'s Avatar
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    Cool gethostbyaddr Help Plz

    Hi,

    Can someone give me an example of using gethostbyaddr to convert and IP to a hostname then display it in a messagebox.
    I have done this to convert a hostname to an IP:

    h = gethostbyname("modem-537.****covered_lol");

    MessageBox(hWnd, inet_ntoa(*((struct in_addr *)h->h_addr)), "IP Address", NULL);

    This works fine and converts the hostname to an IP.

    But i cant work out how to do it the other way round, and convert an IP to a hostname.

    Thanks in advance
    TNT
    You Can Stop Me, But You Cant Stop Us All

  2. #2
    &TH of undefined behavior Fordy's Avatar
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    Hm.. Might be wrong, but I dont think it works that way??

  3. #3
    Registered User johnnie2's Avatar
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    Create an in_addr struct to hold the IP address, send it to gethostbyaddr(), and save the pointer to the returned HOSTENT struct:

    Code:
    in_addr toBeResolved;
    toBeResolved.s_addr = inet_addr("127.0.0.1");
    
    LPHOSTENT hasBeenResolved;
    hasBeenResolved = gethostbyaddr((const char *)&toBeResolved, sizeof(struct in_addr), AF_INET);
    At this point, you have the hostname of the computer in the LPHOSTENT struct.
    "Optimal decisions, once made, do not need to be changed." - Robert Sedgewick, Algorithms in C

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