GetHostByAddr

hermes

Hallo,

habe ein Problem mit gethostbyaddr, ich bekomme immer nur einen NULL Pointer
zurück.

HOSTENT *ptHost;
     IN_ADDR addr;
     addr.S_un.S_addr = inet_addr("127.0.0.1"); //Localhost
     ptHost = gethostbyaddr((char*)&addr, sizeof(addr) , AF_INET);
     if(ptHost != NULL)
     	Edit1->Text = ptHost->h_name;
     else
     	Edit1->Text = "Failed";

Was mache ich da falsch?

Du must noch das Winsock starten:

hostent *ptHost;
     WSAData stData;
     IN_ADDR addr;
     if(WSAStartup(0x0101, &stData) == 0)
     {
     addr.S_un.S_addr = inet_addr("127.0.0.1"); //Localhost
     ptHost = gethostbyaddr((char*)&addr, sizeof(addr) , AF_INET);
     if(ptHost != NULL)
         Edit1->Text = ptHost->h_name;
     else
         Edit1->Text = "Failed";
     }
     WSACleanup();

hermes

Danke Dir!

Was macht WSAStartUp eigentlich, wird hier die DLL in den Speicher geladen?

Aus der msdn

The WSAStartup function initiates use of the Winsock DLL by a process.