三、程序代码
//////////////////////////////Receiver.c程序代码：
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#define MCASTADDR "233.0.0.1" //本例使用的多播组地址。
#define MCASTPORT 5150 //绑定的本地端口号。
#define BUFSIZE 1024 //接收数据缓冲大小。
int main( int argc,char ** argv)
{
WSADATA wsd;
struct sockaddr_in local,remote,from;
SOCKET sock,sockM;
TCHAR recvbuf[BUFSIZE];
/*struct ip_mreq mcast; // Winsock1.0 */
int len = sizeof( struct sockaddr_in);
int ret;
//初始化WinSock2.2
if( WSAStartup( MAKEWORD(2,2),&wsd) != 0 )
{
printf("WSAStartup() failed/n");
return -1;
}
/*
创建一个SOCK_DGRAM类型的SOCKET
其中,WSA_FLAG_MULTIPOINT_C_LEAF表示IP多播在控制面层上属于"无根"类型;
WSA_FLAG_MULTIPOINT_D_LEAF表示IP多播在数据面层上属于"无根",有关控制面层和
数据面层有关概念请参阅MSDN说明。
*/
if((sock=WSASocket(AF_INET,SOCK_DGRAM,0,NULL,0,
WSA_FLAG_MULTIPOINT_C_LEAF|WSA_FLAG_MULTIPOINT_D_LEAF|
WSA_FLAG_OVERLAPPED)) == INVALID_SOCKET)
{
printf("socket failed with:%d/n",WSAGetLastError());
WSACleanup();
return -1;
}
//将sock绑定到本机某端口上。
local.sin_family = AF_INET;
local.sin_port = htons(MCASTPORT);
local.sin_addr.s_addr = INADDR_ANY;
if( bind(sock,(struct sockaddr*)&local,sizeof(local)) == SOCKET_ERROR )
{
printf( "bind failed with:%d /n",WSAGetLastError());
closesocket(sock);
WSACleanup();
return -1;
}
//加入多播组
remote.sin_family = AF_INET;
remote.sin_port = htons(MCASTPORT);
remote.sin_addr.s_addr = inet_addr( MCASTADDR );
/* Winsock1.0 */
/*
mcast.imr_multiaddr.s_addr = inet_addr(MCASTADDR);
mcast.imr_interface.s_addr = INADDR_ANY;
if( setsockopt(sockM,IPPROTO_IP,IP_ADD_MEMBERSHIP,(char*)&mcast,sizeof(mcast)) == SOCKET_ERROR)
{
printf("setsockopt(IP_ADD_MEMBERSHIP) failed:%d/n",WSAGetLastError());
closesocket(sockM);
WSACleanup();
return -1;
}
*/
/* Winsock2.0*/
if(( sockM = WSAJoinLeaf(sock,(SOCKADDR*)&remote,sizeof(remote),NULL,NULL,NULL,NULL, JL_BOTH)) == INVALID_SOCKET)
{
printf("WSAJoinLeaf() failed:%d/n",WSAGetLastError());
closesocket(sock);
WSACleanup();
return -1;
}
//接收多播数据，当接收到的数据为"QUIT"时退出。
while(1)
{
if(( ret = recvfrom(sock,recvbuf,BUFSIZE,0,(struct sockaddr*)&from,&len)) == SOCKET_ERROR)
{
printf("recvfrom failed with:%d/n",WSAGetLastError());
closesocket(sockM);
closesocket(sock);
WSACleanup();
return -1;
}
if( strcmp(recvbuf,"QUIT") == 0 ) break;
else {
recvbuf[ret] = '/0';
printf("RECV:' %s ' FROM <%s> /n",recvbuf,inet_ntoa(from.sin_addr));
}
}
closesocket(sockM);
closesocket(sock);
WSACleanup();
return 0;
}
/////////////////////////////////////////////////////////////////////Sender.c程序代码
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#define MCASTADDR "233.0.0.1" //本例使用的多播组地址。
#define MCASTPORT 5150 //本地端口号。
#define BUFSIZE 1024 //发送数据缓冲大小。
int main( int argc,char ** argv)
{
WSADATA wsd;
struct sockaddr_in remote;
SOCKET sock,sockM;
TCHAR sendbuf[BUFSIZE];
int len = sizeof( struct sockaddr_in);
//初始化WinSock2.2
if( WSAStartup( MAKEWORD(2,2),&wsd) != 0 )
{
printf("WSAStartup() failed/n");
return -1;
}
if((sock=WSASocket(AF_INET,SOCK_DGRAM,0,NULL,0,
WSA_FLAG_MULTIPOINT_C_LEAF|WSA_FLAG_MULTIPOINT_D_LEAF|
WSA_FLAG_OVERLAPPED)) == INVALID_SOCKET)
{
printf("socket failed with:%d/n",WSAGetLastError());
WSACleanup();
return -1;
}
//加入多播组
remote.sin_family = AF_INET;
remote.sin_port = htons(MCASTPORT);
remote.sin_addr.s_addr = inet_addr( MCASTADDR );
if(( sockM = WSAJoinLeaf(sock,(SOCKADDR*)&remote,
sizeof(remote),NULL,NULL,NULL,NULL,
JL_BOTH)) == INVALID_SOCKET)
{
printf("WSAJoinLeaf() failed:%d/n",WSAGetLastError());
closesocket(sock);
WSACleanup();
return -1;
}
//发送多播数据，当用户在控制台输入"QUIT"时退出。
while(1)
{
printf("SEND : ");
scanf("%s",sendbuf);
if( sendto(sockM,(char*)sendbuf,strlen(sendbuf),0,(struct sockaddr*)&remote,sizeof(remote))==SOCKET_ERROR)
{
printf("sendto failed with: %d/n",WSAGetLastError());
closesocket(sockM);
closesocket(sock);
WSACleanup();
return -1;
}
if(strcmp(sendbuf,"QUIT")==0) break;
Sleep(500);
}
closesocket(sockM);
closesocket(sock);
WSACleanup();
return 0;
} |
四、小结
本实例对IP多播通信进行了探讨，实例程序由Sender和Receiver两部分组成，Sender用户从控制台上输入多播发送数据，Receiver端都要求加入同一个多播组，完成接收Sender发送的多播数据。
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