gethostbyaddr()怎麼用的啊?我這樣用怎麼不行啊?

[xhwu3721]

gethostbyaddr()怎麼用的啊?我這樣用怎麼不行啊?
CString addr;
addr="10.132.227.131";
hostAddr=gethostbyaddr(addr,14,AF_INET );
if(hostAddr==NULL)
{
char * buf=new char[100];
strcpy(buf,"can't find the pc ip '");
strcat(buf,m_PcName);
strcat(buf,"'");
MessageBox(buf,"Error");
delete buf;
return;
}

CString sip;
sip.Format("%s",hostAddr->h_name);
m_monitor.InsertString(0,sip);
}

[zhanshenpkl]

你有没有初始化套接字？

[zhanshenpkl]

要么就是地址没有办法解释，DNS解释失败，没有与之相对应的名称。你用WSAGetLastError看错误代码是多少，然后在MSDN中查找这个错误代码的解释。

[zhanshenpkl]

WSANO_DATA
(11004)
Valid name, no data record of requested type.
The requested name is valid and was found in the database, but it does not have the correct associated data being resolved for. The usual example for this is a host name-to-address translation attempt (using gethostbyname or WSAAsyncGetHostByName) which uses the DNS (Domain Name Server). An MX record is returned but no A record—indicating the host itself exists, but is not directly reachable.

[xhwu3721]

已經解決了如下:
CString addr;
addr="10.132.227.131";
sockaddr_in findhostaddr;
findhostaddr.sin_addr.S_un.S_addr=inet_addr(addr);
hostAddr=gethostbyaddr((const char *)&(findhostaddr.sin_addr.S_un.S_addr),4,AF_INET );
if(hostAddr==NULL)
{
char * buf=new char[100];
strcpy(buf,"can't find the pc ip '");
strcat(buf,m_PcName);
strcat(buf,"'");
MessageBox(buf,"Error");
delete buf;
return;
}

CString sip;
sip.Format("The IP "+addr+" PC name is:"+"%s",hostAddr->h_name);
m_monitor.InsertString(0,sip);

[zhanshenpkl]

Although gethostbyaddr is deprecated by the getnameinfo function, gethostbyaddr is capable of returning a NetBIOS name; getnameinfo is not. Developers requiring NetBIOS name resolution may need to use gethostbyaddr until their applications are completely independent of NetBIOS names