UDP组播的原理及VC++实现代码
时间: 2023-06-04 13:07:56 浏览: 307
UDP组播是基于UDP协议的一种多点广播数据传输方式。在传输数据时,只需要向一个组播地址发送数据包,所有加入该组播地址的主机都能够接收到数据。
VC实现代码示例:
```c++
#include <stdio.h>
#include <stdlib.h>
#include <Winsock2.h>
#pragma comment(lib, "ws2_32.lib")
#define MULTICAST_IP "224.0.0.1"
#define PORT 8888
int main()
{
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
sockaddr_in addr;
memset(&addr, 0, sizeof(sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(PORT);
bind(sock, (sockaddr*)&addr, sizeof(sockaddr_in));
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = inet_addr(MULTICAST_IP);
mreq.imr_interface.s_addr = INADDR_ANY;
setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char*)&mreq, sizeof(ip_mreq));
char buf[1024] = { 0 };
sockaddr_in from;
int len = sizeof(sockaddr_in);
while (1)
{
recvfrom(sock, buf, sizeof(buf), 0, (sockaddr*)&from, &len);
printf("recv from %s : %d: %s \n", inet_ntoa(from.sin_addr), ntohs(from.sin_port), buf);
}
closesocket(sock);
WSACleanup();
return 0;
}
```
该示例代码为VC实现的UDP组播监听器。通过加入组播地址和端口,可以实现接收到该组播数据。注意:此示例代码仅为演示组播原理,具体实现请根据需求自行更改。