<div dir="ltr">Sending and receiving should be one the same port.<div style>It seems these functions map quite directly to regular socket functions; for multicast I have to do this (my own library, but it's quite a direct mapping):</div>
<div style><br></div><div style><div>    QNAddress addr;</div><div>    sock=new QNSocket(QNSocket::UNRELIABLE);</div><div>    sock->Open(PORT,QNSocket::NO_BIND);</div><div>    sock->BindAny(PORT);</div><div>    sock->JoinMulticastGroup("226.0.0.1");</div>
<div>    sock->SetMulticastLoop(false);           // Don't receive our own sends</div><div>    sock->SetNonBlocking(true);</div><div>    while(1)</div><div>    {</div><div>      n=sock->Read(buf,sizeof(buf),&addr);</div>
<div>      if(n>0)</div><div>      {</div><div>        buf[n]=0;</div><div>        qdbg("Incoming packet %d bytes (%s).\n",n,buf);</div><div>      }</div><div>    }</div><div><br></div><div style>Where the relevant functions are:</div>
</div><div style><br></div><div style>---</div><div style><div>bool QNSocket::JoinMulticastGroup(cstring addr)</div><div>// Join a multi-cast group.</div><div>// Used for servers. I.e. addr="226.0.0.1"</div><div>
// Use a multi-cast address (224.0.0.1 - 239.255.255.255)</div><div>{</div><div>  ip_mreq imreq;</div><div>  int status;</div><div><br></div><div>  memset(&imreq,0,sizeof(imreq));</div><div><br></div><div>  imreq.imr_multiaddr.s_addr = inet_addr(addr);<br>
</div><div>  imreq.imr_interface.s_addr = INADDR_ANY; // use DEFAULT interface</div><div><br></div><div>  // JOIN multicast group on default interface</div><div>  status = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, </div>
<div>             (char*)&imreq, sizeof(struct ip_mreq));</div><div>  return status>=0;</div><div>}</div><div>---</div><div><div>void QNSocket::SetMulticastLoop(bool yn)</div><div>// Enable loopback to local machine (yn=true) or not (yn=false)</div>
<div>// Default initial state is true</div><div>{</div><div>  int status;</div><div>  char b=yn;</div><div>  status=setsockopt(fd,IPPROTO_IP,IP_MULTICAST_LOOP,(char*)&b,sizeof(unsigned char));</div><div>}</div></div><div>
---</div><div><br></div></div><div class="gmail_extra">Here. I call SetMulticastLoop(false) to avoid all broadcasted message to echo back to localhost (if that's what you want though).</div><div class="gmail_extra"><br>
</div><div class="gmail_extra">Cheers,</div><div class="gmail_extra">Ruud<br><br><div class="gmail_quote">On Sat, Jan 12, 2013 at 11:19 AM, enetcub <span dir="ltr"><<a href="mailto:enet_club@126.com" target="_blank">enet_club@126.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">


<div style="FONT-FAMILY:新宋体;FONT-SIZE:9pt">
<p>HI ALL:</p>
<p> </p>
<p> </p>
<div style="TEXT-ALIGN:left;PADDING-BOTTOM:0px;TEXT-TRANSFORM:none;BACKGROUND-COLOR:rgb(250,251,252);TEXT-INDENT:0px;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;FONT:13px/20px helvetica,arial,verdana,tahoma,sans-serif;WHITE-SPACE:normal;LETTER-SPACING:normal;COLOR:rgb(40,40,40);WORD-SPACING:0px;PADDING-TOP:0px">
once 
a client send broadcast to all host server in a same subnet, how can servers 
recevice the broadcast infomation and make reply to the client </div>
<div style="TEXT-ALIGN:left;PADDING-BOTTOM:0px;TEXT-TRANSFORM:none;BACKGROUND-COLOR:rgb(250,251,252);TEXT-INDENT:0px;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;FONT:13px/20px helvetica,arial,verdana,tahoma,sans-serif;WHITE-SPACE:normal;LETTER-SPACING:normal;COLOR:rgb(40,40,40);WORD-SPACING:0px;PADDING-TOP:0px">
who 
has send the broadcast?</div>
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 </div>
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client 
:</div>
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----------------------------------------------------------------</div>
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<ol style="PADDING-BOTTOM:0px;LIST-STYLE-TYPE:decimal!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;COLOR:rgb(153,153,153)!important;PADDING-TOP:0px"><li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px" value="1">
<span style="COLOR:rgb(0,102,153);FONT-WEIGHT:bold!important">void</span><span style="COLOR:rgb(0,0,0)"> scan_servers_by_send_broadcast</span><span style="COLOR:rgb(102,102,0)">()</span></li><li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px">
<span style="COLOR:rgb(102,102,0)">{</span></li><li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(102,0,102)">ENETAddress</span><span style="COLOR:rgb(0,0,0)"> address</span><span style="COLOR:rgb(102,102,0)">;</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)"> </span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)"> </span></li><li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px">
<span style="COLOR:rgb(0,0,0)">    address</span><span style="COLOR:rgb(102,102,0)">.</span><span style="COLOR:rgb(0,0,0)">host </span><span style="COLOR:rgb(102,102,0)">=</span><span style="COLOR:rgb(0,0,0)"> ENET_HOST_BROADCAST</span><span style="COLOR:rgb(102,102,0)">;</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">    address</span><span style="COLOR:rgb(102,102,0)">.</span><span style="COLOR:rgb(0,0,0)">port </span><span style="COLOR:rgb(102,102,0)">=</span><span style="COLOR:rgb(0,0,0)"> BROADCAST_PORT</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)"> </span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)"> </span></li><li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px">
<span style="COLOR:rgb(102,0,102)">ENETSocket</span><span style="COLOR:rgb(0,0,0)"> socket </span><span style="COLOR:rgb(102,102,0)">=</span><span style="COLOR:rgb(0,0,0)"> ENET_socket_create</span><span style="COLOR:rgb(102,102,0)">(</span><span style="COLOR:rgb(0,0,0)">ENET_SOCKET_TYPE_DATAGRAM</span><span style="COLOR:rgb(102,102,0)">);</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">ENET_socket_set_option</span><span style="COLOR:rgb(102,102,0)">(</span><span style="COLOR:rgb(0,0,0)">socket</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,0,0)">ENET_SOCKOPT_NONBLOCK</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,102,102)">1</span><span style="COLOR:rgb(102,102,0)">);</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">ENET_socket_set_option</span><span style="COLOR:rgb(102,102,0)">(</span><span style="COLOR:rgb(0,0,0)">socket</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,0,0)">ENET_SOCKOPT_BROADCAST</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,102,102)">1</span><span style="COLOR:rgb(102,102,0)">);</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)"> </span></li><li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px">
<span style="COLOR:rgb(0,0,0)"> </span></li><li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">ENET_socket_send</span><span style="COLOR:rgb(102,102,0)">(</span><span style="COLOR:rgb(0,0,0)">socket</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,0,0)">address</span><span style="COLOR:rgb(102,102,0)">,&</span><span style="COLOR:rgb(0,0,0)">broadcast_buf</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,102,102)">1</span><span style="COLOR:rgb(102,102,0)">);</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">ENET_socket_destroy</span><span style="COLOR:rgb(102,102,0)">(</span><span style="COLOR:rgb(0,0,0)">socket</span><span style="COLOR:rgb(102,102,0)">);</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(102,102,0)">}</span></li></ol></pre></div>
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servers:</div>
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[Q: 
How can a server received broadcast information and tell client its ip address 
?]</div>
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<ol style="PADDING-BOTTOM:0px;LIST-STYLE-TYPE:decimal!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;COLOR:rgb(153,153,153)!important;PADDING-TOP:0px"><li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px" value="1">
<span style="COLOR:rgb(102,0,102)">ENETSocket</span><span style="COLOR:rgb(0,0,0)"> socket </span><span style="COLOR:rgb(102,102,0)">=</span><span style="COLOR:rgb(0,0,0)"> ENET_socket_create</span><span style="COLOR:rgb(102,102,0)">(</span><span style="COLOR:rgb(0,0,0)">ENET_SOCKET_TYPE_DATAGRAM</span><span style="COLOR:rgb(102,102,0)">);</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">ENET_socket_set_option</span><span style="COLOR:rgb(102,102,0)">(</span><span style="COLOR:rgb(0,0,0)">socket</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,0,0)">ENET_SOCKOPT_NONBLOCK</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,102,102)">1</span><span style="COLOR:rgb(102,102,0)">);</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">ENET_socket_set_option</span><span style="COLOR:rgb(102,102,0)">(</span><span style="COLOR:rgb(0,0,0)">socket</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,0,0)">ENET_SOCKOPT_REUSEADDR</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,102,102)">1</span><span style="COLOR:rgb(102,102,0)">);</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">ENET_socket_set_option</span><span style="COLOR:rgb(102,102,0)">(</span><span style="COLOR:rgb(0,0,0)">socket</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,0,0)">ENET_SOCKOPT_BROADCAST</span><span style="COLOR:rgb(102,102,0)">,</span><span style="COLOR:rgb(0,102,102)">1</span><span style="COLOR:rgb(102,102,0)">);</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)"> </span></li><li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px">
<span style="COLOR:rgb(0,0,0)"> </span></li><li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(102,0,102)">ENETAddress</span><span style="COLOR:rgb(0,0,0)"> serv_addr</span><span style="COLOR:rgb(102,102,0)">;</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">    serv_addr</span><span style="COLOR:rgb(102,102,0)">.</span><span style="COLOR:rgb(0,0,0)">host</span><span style="COLOR:rgb(102,102,0)">=</span><span style="COLOR:rgb(0,0,0)">ENET_HOST_ANY</span><span style="COLOR:rgb(102,102,0)">;</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">    serv_addr</span><span style="COLOR:rgb(102,102,0)">.</span><span style="COLOR:rgb(0,0,0)">port</span><span style="COLOR:rgb(102,102,0)">=</span><span style="COLOR:rgb(0,0,0)">BROADCAST_PORT</span><span style="COLOR:rgb(102,102,0)">;</span><span style="COLOR:rgb(0,0,0)">      </span><span style="COLOR:rgb(0,130,0)!important">// IS THIS RIGHT?</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;BACKGROUND-COLOR:rgb(252,252,252);LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(0,0,0)">ENET_socket_bind</span><span style="COLOR:rgb(102,102,0)">(</span><span style="COLOR:rgb(0,0,0)">socket</span><span style="COLOR:rgb(102,102,0)">,&</span><span style="COLOR:rgb(0,0,0)">serv_addr</span><span style="COLOR:rgb(102,102,0)">);</span></li>
<li style="LIST-STYLE-POSITION:inside;PADDING-BOTTOM:2px;LIST-STYLE-TYPE:none!important;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:2px"><span style="COLOR:rgb(102,102,0)">...........</span></li></ol></pre></div>

<p style="PADDING-BOTTOM:0px;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;PADDING-TOP:0px"> </p></div>
<div style="TEXT-ALIGN:left;PADDING-BOTTOM:0px;TEXT-TRANSFORM:none;BACKGROUND-COLOR:rgb(250,251,252);TEXT-INDENT:0px;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;FONT:13px/20px helvetica,arial,verdana,tahoma,sans-serif;WHITE-SPACE:normal;LETTER-SPACING:normal;COLOR:rgb(40,40,40);WORD-SPACING:0px;PADDING-TOP:0px">
I 
DON'T KNOW WHAT SHOULD DO AFTER BINDING,,,,,  HELP ME PLEASE 
,THANKS/...</div>
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 </div>
<div style="TEXT-ALIGN:left;PADDING-BOTTOM:0px;TEXT-TRANSFORM:none;BACKGROUND-COLOR:rgb(250,251,252);TEXT-INDENT:0px;MARGIN:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;FONT:13px/20px helvetica,arial,verdana,tahoma,sans-serif;WHITE-SPACE:normal;LETTER-SPACING:normal;COLOR:rgb(40,40,40);WORD-SPACING:0px;PADDING-TOP:0px">
any 
more, does BROADCAST_PORT shold be different from the SERVER_MAIN_SERVICE_PORT 
?</div></div>
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<br></blockquote></div><br></div></div>