{

SOCKET sock;

//1.启动SOCKET库，版本为2.0

WORD wVersionRequested;

WSADATA wsaData;

int err;

wVersionRequested = MAKEWORD( 2, 0 );

err = WSAStartup( wVersionRequested, &wsaData );

if (0 != err)

{

cout<<"Socket2.0初始化失败，Exit!";

return;

}

if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 0 )

{

WSACleanup();

return;

}

//2.创建套接字

sock = socket(AF_INET,SOCK_DGRAM,0);

if (INVALID_SOCKET == sock)

{

cout<<"Socket 创建失败，Exit!";

return;

}

//3.设置该套接字为广播类型，

bool opt=true;

setsockopt(sock,SOL_SOCKET, SO_BROADCAST,(char FAR *)&opt,sizeof(opt));

//4.创建地址

sockaddr_in from;

memset(&from,0,sizeof(from));

from.sin_family=AF_INET;

//如果绑定地址不是本机地址或者ADDR_ANY，则recvfrom函数不会正确接收，而是立刻返回

// from.sin_addr.s_addr = ADDR_ANY;

from.sin_addr.s_addr = inet_addr("192.168.0.7");

//端口号必须和客户发往的端口号一致

from.sin_port=htons(7861);

//5.绑定接收地址

bind(sock,(sockaddr*)&from,sizeof(from));

memset(&from,0,sizeof(from));

int fromlength = sizeof(SOCKADDR);

char buf[256];

memset(buf,0,sizeof(buf));

long number = 0;

while(true){

number++;

// recvfrom(sock,buf,256,0,(struct sockaddr FAR *)&from,(int FAR *)&fromlength);

recv(sock,buf,256,0);

Sleep(1000);

cout<<number<<":"<<buf<<endl;

memset(buf,0,sizeof(buf));

}

if (!closesocket(sock)) {

WSAGetLastError();

return;

}

if (!WSACleanup()) {

WSAGetLastError();

return;

}