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能否用socket(...)来取代WSASocket(,,,)创建加入多播的socket?应该怎么写?

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悬赏园豆:80 [待解决问题]

在创建接受multicast的socket的时候,很多人都这样写:

    m_SocketMulticast=//socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
        WSASocket(AF_INET,SOCK_DGRAM,0,NULL,0,WSA_FLAG_MULTIPOINT_C_LEAF|WSA_FLAG_MULTIPOINT_D_LEAF|WSA_FLAG_OVERLAPPED);
    sockaddr_in addrMulti;
    addrMulti.sin_family=AF_INET;
    addrMulti.sin_addr.s_addr=inet_addr(pIp);
    addrMulti.sin_port=htons(GROUP_PORT);
    if( SOCKET_ERROR==bind(m_SocketMulticast,(sockaddr*)&addrMulti,sizeof(addrMulti)) )
    {
int error_code=WSAGetLastError();
wchar_t pwchar[10];
_itow_s( error_code, pwchar, 10, 10);
        ::MessageBoxW(NULL,pwchar,_T("Binding the multicast port failed"),MB_OK);
        return;
    }

    bool  reuseport=1;
    setsockopt(m_SocketMulticast,SOL_SOCKET ,SO_REUSEADDR,(const char*)& reuseport,sizeof(bool));
    int timeout=1000;
    setsockopt( m_SocketMulticast,SOL_SOCKET,SO_RCVTIMEO,(const char*)&timeout,sizeof(int) );
    sockaddr_in remote;
    remote.sin_family      = AF_INET;
    remote.sin_port        = htons(GROUP_PORT);
    remote.sin_addr.s_addr = inet_addr(GROUP_IP);
    SOCKET sockM;
    if ((sockM = WSAJoinLeaf(m_SocketMulticast, (SOCKADDR *)&remote, 
    sizeof(remote), NULL, NULL, NULL, NULL, 
    JL_BOTH)) == INVALID_SOCKET)
    {
int error_code=WSAGetLastError();
wchar_t pwchar[10];
_itow_s( error_code, pwchar, 10, 10);
        ::MessageBoxW(NULL,pwchar,_T("Add Multicast Membership Failed!"),NULL);
    }

Window socket 2.0下,是否可以直接socket(...)来取代WSASocket(...)创建socket,加入multicast组?谢谢!

guanlongcun的主页 guanlongcun | 初学一级 | 园豆:16
提问于:2014-06-27 21:22
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所有回答(1)
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其实 socket 和 WSASocket 类似的,在socket 内部调用WSASocket,但是dwFlags 却是默认值(调试可知)和你设置的WSA_FLAG_MULTIPOINT_C_LEAF|WSA_FLAG_MULTIPOINT_D_LEAF|WSA_FLAG_OVERLAPPED可能会不同,不同的话,调用WSAJoinLeaf就会失败。

SOCKET __stdcall socket(int af, int type, int protocol)
{
SOCKET result; // eax@5
DWORD v4; // eax@7
LPVOID v5; // [sp+4h] [bp-4h]@3

if ( PrologPointer == Prolog_v2 && DPROCESS::sm_current_dprocess && (v5 = TlsGetValue(DTHREAD::sm_tls_index)) != 0
|| (v4 = SlowPrologOvlp(&v5)) == 0 )
{
if ( af == 17 )
{
if ( protocol > 0 )
protocol = -protocol;
}
result = WSASocketW(af, type, protocol, 0, 0, *((_DWORD *)v5 + 22) == 0);
}
else
{
SetLastError(v4);
result = -1;
}
return result;
}

bkdrong | 园豆:212 (菜鸟二级) | 2014-06-28 15:56
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