SOCKET API嵌套字加入IP地址可以，加入域名为何不行？

[vc8fans]

WSADATA wsadata;
SOCKET server;
SOCKADDR_IN serveraddr;

CString m_addr; //IP地址

m_addr = "245,99,34.84"; //这样的地址能运行

server=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
serveraddr.sin_family=AF_INET;
serveraddr.sin_port=htons(port);
serveraddr.sin_addr.S_un.S_addr=inet_addr(m_addr.LockBuffer());

if(connect(server,(SOCKADDR*)&serveraddr,sizeof(serveraddr))<0)
{
GetDlgItem(IDC_WORK_STATE)->SetWindowText("连接失败!");
AfxMessageBox("Connect Server Error!");
return ;
}


问：m_addr = "myIP.gicp.net"; //的域名就不能用 如何才能直接用域名。?????

另：CSocket *pclient //用MFC 的CSocket类 用域名就可以
pclient->Connect("myIP.gicp.net",3304); //连接服务端

[franzhong]

int socket(int domain,int type,int protocol);
tcp/ip domain应为AF_INET
你输入的字母应该是转换不了了
你可以在别的地方先域名解析出来把他转换成AF_INET型就可以了吧

[vc8fans]

域名转IP是个好办法，有例子吗?谢谢！

[stjay]

serveraddr.sin_addr.S_un.S_addr=inet_addr(m_addr.LockBuffer());

if (serveraddr.sin_addr.S_un.S_addr == INADDR_NONE)
{
  LPHOSTENT lphost;
  lphost = gethostbyname(m_addr);
  if (lphost != NULL)
    serveraddr.sin_addr.S_un.S_addr = ((LPIN_ADDR)lphost->h_addr)->s_addr;
}

[vc8fans]

自己搞定了

CString CMyDlg::GetIPAddress(CString strHost)
{
CString strIP;
WSADATA wsaData;
HOSTENT *pHostEnt;
struct sockaddr_in sAddr;
int nAdapter = 0;

if(WSAStartup(0x0101, &wsaData))
{
printf( "WSAStartup failed %s\n ", WSAGetLastError());
return strIP;
}

pHostEnt = gethostbyname(strHost.GetBuffer(0));

while(pHostEnt-> h_addr_list[nAdapter])
{
// pHostEnt-> h_addr_list[nAdapter] is the current address in host
// order.
// Copy the address information from the pHostEnt to a sockaddr_in
// structure.
memcpy(&sAddr.sin_addr.s_addr, pHostEnt->h_addr_list[nAdapter],pHostEnt->h_length);
// Output the machines IP Address.
strIP.Format( "%s", inet_ntoa(sAddr.sin_addr));
nAdapter++;
}
WSACleanup();

return strIP;
}