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<HTML>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Author" CONTENT="Ambreen Ilyas">
<META NAME="GENERATOR" CONTENT="Mozilla/4.05 [en] (X11; I; SunOS 5.5.1 sun4u) [Netscape]">
<TITLE>Example 5</TITLE>
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<BODY>
<FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT>
<BR><FONT COLOR="#CC0000">//// This example is from the ACE Programmers
Guide.</FONT>
<BR><FONT COLOR="#CC0000">//// Chapter: "IPC SAP" (Interprocess Communication
Mechanisms in ACE).</FONT>
<BR><FONT COLOR="#CC0000">//// For details please see the guide at</FONT>
<BR><FONT COLOR="#CC0000">//// http://www.cs.wustl.edu/~schmidt/ACE.html</FONT>
<BR><FONT COLOR="#CC0000">//// AUTHOR: Umar Syyid (usyyid@hns.com)</FONT>
<BR><FONT COLOR="#CC0000">//// and Ambreen Ilyas (ambreen@bitsmart.com)</FONT>
<BR><FONT COLOR="#CC0000">/////////////////////////////////////////////////////////////////////////////////////////////////////////////</FONT>
<P><FONT COLOR="#CC0000">//Example 5</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/SOCK_Dgram_Mcast.h"</FONT>
<BR><FONT COLOR="#000099">#include</FONT> <FONT COLOR="#006600">"ace/OS.h"</FONT>
<BR><FONT COLOR="#000099">#define</FONT> <FONT COLOR="#663366">DEFAULT_MULTICAST_ADDR
"224.9.9.2"</FONT>
<BR><FONT COLOR="#000099">#define</FONT> <FONT COLOR="#663366">TIMEOUT
5</FONT>
<P>class Reciever_Multicast{
<P>public:
<BR>Reciever_Multicast(int port):
<BR> mcast_addr_(port,DEFAULT_MULTICAST_ADDR),remote_addr_((u_short)0){
<BR> <FONT COLOR="#FF0000"> // Subscribe to multicast address.</FONT>
<BR> if (mcast_dgram_.subscribe (mcast_addr_) == -1){
<BR> ACE_DEBUG((LM_DEBUG,"Error in subscribing to Multicast address
\n"));
<BR> exit(-1);
<BR> }
<BR>}
<P>~Reciever_Multicast(){
<BR> if(mcast_dgram_.unsubscribe()==-1)
<BR> ACE_DEBUG((LM_ERROR,?Error in unsubscribing from Mcast group\n?));
<BR> }
<BR>
<BR>
<BR>
<P><FONT COLOR="#FF0000">//Receive data from someone who is sending data
on the multicast group</FONT>
<BR><FONT COLOR="#FF0000">//address to do so it must use the multicast
datagram component</FONT>
<BR><FONT COLOR="#FF0000">//mcast_dgram_.</FONT>
<BR>int recv_multicast(){
<BR><FONT COLOR="#FF0000"> //get ready to recieve data from the sender.</FONT>
<BR> if(mcast_dgram_.recv
<BR> (&mcast_info,sizeof (mcast_info),remote_addr_)==-1)
<BR> return -1;
<BR> ACE_DEBUG ((LM_DEBUG, "(%P|%t) Received multicast from %s:%d.\n",
<BR> remote_addr_.get_host_name(), remote_addr_.get_port_number()));
<BR> ACE_DEBUG((LM_DEBUG,"Successfully receieved %d\n", mcast_info));
<BR> return 0;
<BR> }
<P>private:
<BR> ACE_INET_Addr mcast_addr_;
<BR> ACE_INET_Addr remote_addr_;
<BR> ACE_SOCK_Dgram_Mcast mcast_dgram_;
<BR> int mcast_info;
<BR>};
<BR>
<BR>
<BR>int main(int argc, char*argv[]){
<BR> Reciever_Multicast m(2000);
<BR> <FONT COLOR="#FF0000">//Will run forever</FONT>
<BR> while(m.recv_multicast()!=-1) {
<BR> ACE_DEBUG((LM_DEBUG,"Multicaster succesful \n"));
<BR> }
<BR>
<BR> ACE_DEBUG((LM_ERROR,"Multicaster failed \n"));
<BR> exit(-1);
<BR>}
<P> <A HREF="ex06.html">Next Example</A>
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