广播数据

#include <winsock2.h>

#pragma comment(lib,"ws2_32.lib")

using namespace std;

int main()

{

    WSAData data;

    WSAStartup(MAKEWORD(2, 2), &data);

    SOCKET  s;

    BOOL bRroadcast = TRUE;

    

    s = WSASocket(AF_INET, SOCK_DGRAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);

    setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char*)&bRroadcast, sizeof(BOOL));

    SOCKADDR_IN bcast;

    bcast.sin_family = AF_INET;

    bcast.sin_addr.s_addr = htonl(INADDR_BROADCAST);

    bcast.sin_port = htons(6000);

    char * sMsg = "this is a test";

    sendto(s, sMsg, strlen(sMsg), 0, (SOCKADDR*)&bcast, sizeof(bcast));

    

    closesocket(s);

    WSACleanup();

    //SO_KEEPALIVE;

    

    getchar();

    return 0;

}