Variable type

Hello. I just started using WinSock and i was using this guide for creating client:
http://www.codeproject.com/KB/IP/winsockintro02.aspx
Everything seems pretty easy in this guide exept one thing... What type of variable should i use for 'addr'?

Code:

---

if(inet_addr(servername)==INADDR_NONE)
{
    hp=gethostbyname(servername);
}
else
{
    addr=inet_addr(servername);
    hp=gethostbyaddr((char*)&addr,sizeof(addr),AF_INET);
}
if(hp==NULL)
{
    closesocket(conn);
    return;
}

---

Thank you

MSDN

I tried this

Code:

---

const char addr[13] = "192.168.1.65";
hostent *hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET);

---

gethostbyaddr returned 0. Maybe i'm doing something wrong?

Did you call WSAStartup?

Yes. I call it at the begining of my code

Code:

---

WSADATA wsaData;
int wsaret = WSAStartup(0x101, &wsaData);

---

also, WSAGetLastError returned 11004 - WSANO_DATA
http://msdn.microsoft.com/en-us/library/ms740668
It seems that gethostbyaddr founds addres, but has no data about it? Maybe its because 192.168.1.65 is in my local network?

EDIT
Its same when i changed ip to my gateway ip...

According to http://msdn.microsoft.com/en-us/libr...21(VS.85).aspx gethostbyname is deprecated and getnameinfo should be used instead. In the remarks for getnameinfo, http://msdn.microsoft.com/en-us/libr...(v=VS.85).aspx, the name lookup is described as being either a reverse DNS or local hosts file lookup result i.e. without having a DNS entry or a hosts file entry it will fail. Try using 127.0.0.1 instead and you probably will get localhost as the result

inet_addr returns an unsigned long value.

Quote:

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Originally Posted by itsmeandnobodyelse

inet_addr returns an unsigned long value.

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First param to gethostbyaddr should be 'A pointer to an address in network byte order' and that's what inet_addr returns so that should be alright.