windows C++ UDP 多播

原文链接http://blog.csdn.net/weixinhum/article/details/26784717

// 服务器端
// Server.cpp : Defines the entry point for the console application.
//
#include <WinSock2.h>
#include <stdio.h>
#include <iostream>
using namespace std;
#pragma comment(lib, “ws2_32.lib”)
const int MAX_BUF_LEN = 10;
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
// 启动socket api
wVersionRequested = MAKEWORD(2, 2);
err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0)
{
return;
}
if (LOBYTE(wsaData.wVersion) != 2 ||
HIBYTE(wsaData.wVersion) != 2)
{
WSACleanup();
return;
}
// 创建socket
SOCKET connect_socket;
connect_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (INVALID_SOCKET == connect_socket)
{
err = WSAGetLastError();
printf(“error! error code is %d/n”, err);
return;
}
SOCKADDR_IN sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(3779);
//sin.sin_addr.s_addr = INADDR_BROADCAST;
sin.sin_addr.s_addr = inet_addr(“255.255.255.255”);//设置广播地址,window下用这种形式方可
bool bOpt = true;
//设置该套接字为广播类型
setsockopt(connect_socket, SOL_SOCKET, SO_BROADCAST, (char*)&bOpt, sizeof(bOpt));
int nAddrLen = sizeof(SOCKADDR);
char buff[MAX_BUF_LEN] = “”;
while (1)
{
sprintf_s(buff, “%s”,“ss”);
// 发送数据
int nSendSize = sendto(connect_socket, buff, strlen(buff), 0, (SOCKADDR*)&sin, nAddrLen);
if (SOCKET_ERROR == nSendSize)
{
err = WSAGetLastError();
printf(“error!, error code is %d/n”, err);
return;
}
printf(“Send: %s/n”, buff);
Sleep(500);
}
}

// 客户端
// Client.cpp : Defines the entry point for the console application.
//
#include <WinSock2.h>
#include <stdio.h>
#pragma comment(lib, “ws2_32.lib”)
const int MAX_BUF_LEN = 255;
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
// 启动socket api
wVersionRequested = MAKEWORD(2, 2);
err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0)
{
return;
}
if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2)
{
WSACleanup();
return;
}
// 创建socket
SOCKET connect_socket;
connect_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (INVALID_SOCKET == connect_socket)
{
err = WSAGetLastError();
printf(“error! error code is %d/n”, err);
return;
}
// 用来绑定套接字
SOCKADDR_IN sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(3779);
sin.sin_addr.s_addr = 0;
// 用来从网络上的广播地址接收数据
SOCKADDR_IN sin_from;
sin_from.sin_family = AF_INET;
sin_from.sin_port = htons(3779);
sin_from.sin_addr.s_addr = INADDR_BROADCAST;
//设置该套接字为广播类型，
bool bOpt = true;
setsockopt(connect_socket, SOL_SOCKET, SO_BROADCAST, (char*)&bOpt, sizeof(bOpt));
// 绑定套接字
err = bind(connect_socket, (SOCKADDR*)&sin, sizeof(SOCKADDR));
if (SOCKET_ERROR == err)
{
err = WSAGetLastError();
printf(“error! error code is %d/n”, err);
return;
}
int nAddrLen = sizeof(SOCKADDR);
char buff[MAX_BUF_LEN] = “”;
int nLoop = 0;
while (1)
{
// 接收数据
int nSendSize = recvfrom(connect_socket, buff, MAX_BUF_LEN, 0, (SOCKADDR*)&sin_from, &nAddrLen);
if (SOCKET_ERROR == nSendSize)
{
err = WSAGetLastError();
printf(“error! error code is %d/n”, err);
return;
}
buff[nSendSize] = ‘/0’;
printf(“Recv: %s/n”, buff);
}
}

原文链接http://blog.csdn.net/weixinhum/article/details/26784717

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