廣播端:
// broadcast.cpp : 定義控制檯應用程序的入口點。
//
#include "stdafx.h"
#include "stdafx.h"
#include <iostream>
#include <stdio.h>
#include <WinSock2.h>
#pragma comment(lib, "ws2_32.lib")
using namespace std;
const int MAX_BUF_LEN = 255;
int _tmain(int argc, _TCHAR* argv[])
{
WORD wVersionRequested;
WSADATA wasData;//指向WinSocket信息結構的指針
int err;
wVersionRequested = MAKEWORD(2, 2);
// 初始化winsock庫,使用socket的前提
err = WSAStartup(wVersionRequested, &wasData);
if (err != 0)
{
return -1;
}
if (LOBYTE(wasData.wVersion) != 2 || HIBYTE(wasData.wVersion) != 2)
{
WSACleanup();
return -1;
}
SOCKET conn_sock = socket(AF_INET, SOCK_DGRAM, 0);
if (conn_sock == INVALID_SOCKET)
{
err = WSAGetLastError();
printf("socket error:%d\n", err);
closesocket(conn_sock);
WSACleanup();
return -1;
}
bool bOpt = true;
//打開廣播選項
setsockopt(conn_sock, SOL_SOCKET, SO_BROADCAST, (char*)&bOpt, sizeof(bOpt));
// 設置發往的地址
SOCKADDR_IN saUdpServ;
memset(&saUdpServ, 0, sizeof(saUdpServ));
saUdpServ.sin_family = AF_INET;
saUdpServ.sin_addr.S_un.S_addr = htonl(INADDR_BROADCAST);
saUdpServ.sin_port = htons(7001);
int nSize = sizeof(SOCKADDR_IN);
char buff[MAX_BUF_LEN];
memset(buff, 0, MAX_BUF_LEN);
int nLoop = 0;
char* ip = NULL;
while (1){
nLoop++;
sprintf(buff, "Message %d", nLoop);
int nSendSize = sendto(conn_sock, buff, strlen(buff), 0, (SOCKADDR*)&saUdpServ, nSize);
if (nSendSize == SOCKET_ERROR)
{
err = WSAGetLastError();
printf("sendto error:%d\n", err);
closesocket(conn_sock);
WSACleanup();
return -1;
}
printf("send: %s\n", buff);
Sleep(5000);
}
closesocket(conn_sock);
WSACleanup();
return 0;
}
接收“廣播”端
// wait_broadcast.cpp : 定義控制檯應用程序的入口點。
//
#include "stdafx.h"
#include "stdafx.h"
#include <iostream>
#include <WinSock2.h>
#pragma comment(lib, "ws2_32.lib")
const int MAX_BUF_LEN = 255;
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(2, 2);
err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0)
{
return -1;
}
if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2)
{
WSACleanup();
return -1;
}
SOCKET clientSock = socket(AF_INET, SOCK_DGRAM, 0);
if (INVALID_SOCKET == clientSock)
{
err = WSAGetLastError();
printf("socket error:%d\n", err);
WSACleanup();
return -1;
}
//創建本地地址信息並綁定
SOCKADDR_IN sin;
sin.sin_family = AF_INET;
sin.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
sin.sin_port = htons(7001);
if (bind(clientSock, (SOCKADDR*)&sin, sizeof(sin)) != 0)
{
err = WSAGetLastError();
printf("bind error:%d\n", err);
closesocket(clientSock);
WSACleanup();
return -1;
}
SOCKADDR_IN clientAddr;
int addrLen = sizeof(clientAddr);
int nSize;
char recvBuff[1024];
memset(recvBuff, 0, 1024);
while (1){
nSize = recvfrom(clientSock, recvBuff, 1024, 0, (SOCKADDR*)&clientAddr, &addrLen);
if (nSize == SOCKET_ERROR)
{
err = WSAGetLastError();
printf("recv error:%d\n", err);
break;
}
recvBuff[nSize] = '\0';
printf("%s\n", recvBuff);
}
closesocket(clientSock);
WSACleanup();
return 0;
}