udp奇异的异常！接收数据总是在关闭句柄之后才过来?
udp客户端向服务器发送一个udp数据包，服务器返回，客户端等待N秒钟，在N秒之内等待数据到来，然后我用wireshark抓包。

不管N是2秒还是20秒，抓包显示，总是在客户端关闭了udp的连接句柄之后，wireshark刷的一下查询到udp应答包了，奇怪呀，谁能看看是什么问题？代码如下，关键部分在while(1)往后~~~~~~~~~~

C/C++ code

/********************************** Code ************************************/BOOL __stdcall myfunction(int m_wait,                    void(WINAPI *notify)(int devtype,char *m_sername,char *m_url,BYTE m_mac[6],WORD m_webport,WORD m_localport,                    char *m_submask,char *m_getway,char *m_multiip,char *m_dns,WORD m_multiport,int channel),char *localurl){    int s_sendrand;    BOOL RetVal = FALSE;    unsigned int timenow,presec;    NETBOARDMSG_SEARCH_RET *pSearchRet;    char ipvs_url[20];    char ipvs_submask[20];    char ipvs_getway[20];    char ipvs_multiurl[20];    char ipvs_dns[20];    int iRet;    fd_set  fdRead;    struct    timeval    timeout;    NET_MSG_BUFF pMsgBuff;    struct sockaddr_in  LocalAddr;    struct ip_mreq stMreq;    SOCKET s_boardmsg = INVALID_SOCKET;    char ttl = (char)32;    unsigned long addr;    char localip[20];    strcpy(localip,"0.0.0.0");    if(localurl)        strcpy(localip,localurl);    srand(time(NULL));    s_sendrand = rand();    if((s_boardmsg = socket(AF_INET,SOCK_DGRAM,0))  == INVALID_SOCKET)     {        goto exit_cam;    }    memset(&LocalAddr,0,sizeof(LocalAddr));    LocalAddr.sin_family      = AF_INET;    LocalAddr.sin_addr.s_addr = inet_addr(localip);    LocalAddr.sin_port        = htons(BOARDCLIENTPORT);    if(bind(s_boardmsg, (struct sockaddr*)&LocalAddr, sizeof(LocalAddr)) == SOCKET_ERROR)    {        goto exit_cam;    }    setsockopt(s_boardmsg,IPPROTO_IP,IP_MULTICAST_TTL,&ttl,sizeof(ttl));     addr = inet_addr(localip);    setsockopt(s_boardmsg, IPPROTO_IP, IP_MULTICAST_IF,(char *)&addr, sizeof(addr));     stMreq.imr_multiaddr.s_addr = inet_addr(BOARDURL_MULTI);    stMreq.imr_interface.s_addr = inet_addr(localip);    if(setsockopt(s_boardmsg, IPPROTO_IP, IP_ADD_MEMBERSHIP,         (char*)&stMreq,    sizeof(stMreq)) <0)    {        printf("Join a multicast group failed!\n");        goto exit_cam;    }    pMsgBuff.pMsgHead.nChannel   = s_sendrand;    pMsgBuff.pMsgHead.dwDataSize = 0;    pMsgBuff.pMsgHead.nTypeMain  = NETBOARDMSG_SEARCH;    pMsgBuff.pMsgHead.pMask1     = MSGHEAD_MASK1;    pMsgBuff.pMsgHead.pMask2     = MSGHEAD_MASK2;    memset(&LocalAddr,0,sizeof(LocalAddr));    LocalAddr.sin_family      = AF_INET;    LocalAddr.sin_addr.s_addr = inet_addr(BOARDURL_MULTI);    LocalAddr.sin_port        = htons(BOARDSERVERPORT);    sendto(s_boardmsg,(char*)&pMsgBuff,sizeof(NET_MSG_HEAD),0,        (struct sockaddr*)&LocalAddr,sizeof(LocalAddr));    pSearchRet = (NETBOARDMSG_SEARCH_RET*)pMsgBuff.pMsgBuff;    timeout.tv_sec  = m_wait / 1000;    timeout.tv_usec = m_wait % 1000;    RetVal = TRUE;    presec = timeGetTime();    while(1)                                  ////////等待响应的部分从这里开始    {        timenow = timeGetTime();        if((timenow - presec) >= m_wait)        {            OutputDebugStr("超时结束\n");            break;        }        fdRead.fd_count    = 1;        fdRead.fd_array[0] = s_boardmsg;        iRet = select(0,&fdRead,NULL,NULL,&timeout);        if(iRet == 0)        {OutputDebugStr("继续\n");            continue;        }        iRet = recv(s_boardmsg,(char*)&pMsgBuff,            sizeof(NET_MSG_HEAD) + sizeof(NETBOARDMSG_SEARCH_RET),0);        char sz[100];        sprintf(sz, "hhhhhhh:%d\n", iRet);        OutputDebugStr(sz);        if((iRet == (sizeof(NET_MSG_HEAD) + sizeof(NETBOARDMSG_SEARCH_RET)))            && (s_sendrand == pMsgBuff.pMsgHead.nChannel) )        {            if(pMsgBuff.pMsgHead.pMask1 != MSGHEAD_MASK1                || pMsgBuff.pMsgHead.pMask2 != MSGHEAD_MASK2                || pMsgBuff.pMsgHead.nTypeMain != NETBOARDMSG_SEARCH)                continue;            LocalAddr.sin_addr.s_addr = pSearchRet->url;            strcpy(ipvs_url,inet_ntoa(LocalAddr.sin_addr));            LocalAddr.sin_addr.s_addr = htonl(pSearchRet->submask);            strcpy(ipvs_submask,inet_ntoa(LocalAddr.sin_addr));            LocalAddr.sin_addr.s_addr = pSearchRet->getway;            strcpy(ipvs_getway,inet_ntoa(LocalAddr.sin_addr));            LocalAddr.sin_addr.s_addr = pSearchRet->multiip;            strcpy(ipvs_multiurl,inet_ntoa(LocalAddr.sin_addr));            LocalAddr.sin_addr.s_addr = pSearchRet->dns;            strcpy(ipvs_dns,inet_ntoa(LocalAddr.sin_addr));            if(notify)             {                notify(    pSearchRet->devtype,pSearchRet->sername,ipvs_url,pSearchRet->mac,                    pSearchRet->wPortWeb,pSearchRet->wPortSer,                    ipvs_submask,ipvs_getway,ipvs_multiurl,ipvs_dns,pSearchRet->wPortMulti,pSearchRet->channel);            }        }    }exit_cam:    if(s_boardmsg != INVALID_SOCKET)    {        stMreq.imr_multiaddr.s_addr = inet_addr(BOARDURL_MULTI);        stMreq.imr_interface.s_addr = inet_addr(localip);        setsockopt(s_boardmsg, IPPROTO_IP, IP_DROP_MEMBERSHIP,(char*)&stMreq,    sizeof(stMreq));        closesocket(s_boardmsg);        OutputDebugStr("这里\n");    }    OutputDebugStr("这里2\n");    return RetVal;} 
 

[解决办法]
iRet = recv(s_boardmsg,(char*)&pMsgBuff//换成recvfrom再试
[解决办法]
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