gethostbyname

ji_angwen 2010-04-08 01:58:07

调用gethostbyname返回错误WSAHOST_NOT_FOUND怎么解决?

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Un1 2010-04-26

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WSAStartup

【天运子】 2010-04-17

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先获得本机主机名，pHost=gethostbyname(strHostName);
strHostName应该是主机名吧，你好像是写进去的
用char HostName[100];
gethostname(HostName, sizeof(HostName));// 获得本机主机名.
试试不知有没有用对你

ji_angwen 2010-04-16

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自己顶咯

ji_angwen 2010-04-12

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正常代码：
void CChatDlg::OnBtnSend()
{
// TODO: Add your control notification handler code here
DWORD dwIP;
CString strSend;
WSABUF wsabuf;
DWORD dwSend;
int len;
SOCKADDR_IN addrTo;
((CIPAddressCtrl*)GetDlgItem(IDC_IPADDRESS1))->GetAddress(dwIP);
addrTo.sin_addr.S_un.S_addr=htonl(dwIP);
addrTo.sin_family=AF_INET;
addrTo.sin_port=htons(6000);

GetDlgItemText(IDC_EDIT_SEND,strSend);
len=strSend.GetLength();
wsabuf.buf=strSend.GetBuffer(len);
wsabuf.len=len+1;

SetDlgItemText(IDC_EDIT_SEND,"");

if(SOCKET_ERROR==WSASendTo(m_socket,&wsabuf,1,&dwSend,0,(SOCKADDR*)&addrTo,sizeof(SOCKADDR),NULL,NULL))
{
MessageBox("发送数据失败！");
return;
}
}
加了if-else语句后的错误代码：
void CChatDlg::OnBtnSend()
{
// TODO: Add your control notification handler code here
DWORD dwIP;
CString strSend;
WSABUF wsabuf;
DWORD dwSend;
int len;
SOCKADDR_IN addrTo;
CString strHostName;
HOSTENT *pHost;

if(GetDlgItemText(IDC_EDIT_HOSTNAME,strHostName),strHostName=="")
{
((CIPAddressCtrl*)GetDlgItem(IDC_IPADDRESS1))->GetAddress(dwIP);
addrTo.sin_addr.S_un.S_addr=htonl(dwIP);

}
else
{
pHost=gethostbyname(strHostName);
int nihao=WSAGetLastError();
CString str;
str.Format("%d",nihao);

if(WSAHOST_NOT_FOUND==nihao)
{
MessageBox("是的1");
}
if(WSATRY_AGAIN==nihao)
{
MessageBox("是的2");
}
if(WSANO_RECOVERY==nihao)
{
MessageBox("是的3");
}

addrTo.sin_addr.S_un.S_addr=*((DWORD*)pHost->h_addr_list[0]);
}

addrTo.sin_family=AF_INET;
addrTo.sin_port=htons(6000);

GetDlgItemText(IDC_EDIT_SEND,strSend);
len=strSend.GetLength();
wsabuf.buf=strSend.GetBuffer(len);
wsabuf.len=len+1;

SetDlgItemText(IDC_EDIT_SEND,"");

if(SOCKET_ERROR==WSASendTo(m_socket,&wsabuf,1,&dwSend,0,(SOCKADDR*)&addrTo,sizeof(SOCKADDR),NULL,NULL))
{
MessageBox("发送数据失败！");
return;
}

}