实验二 UDP通信实验 试验报告(2)

int main()

{

// 创建套节字

SOCKET s = ::socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

if(s == INVALID_SOCKET)

{

printf("Failed socket() \n");

return 0;

}

// 填充sockaddr_in结构

sockaddr_in sin;

sin.sin_family = AF_INET;

sin.sin_port = htons(4567);

sin.sin_addr.S_un.S_addr = INADDR_ANY;

// 绑定这个套节字到一个本地地址

if(::bind(s, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)

{

printf("Failed bind() \n");

return 0;

}

// 接收数据

char buff[1024];

sockaddr_in addr;

int nLen = sizeof(addr);

while(TRUE)

{

int nRecv = ::recvfrom(s, buff, 1024, 0, (sockaddr*)&addr, &nLen); if(nRecv > 0)

{

buff[nRecv] = '\0';

printf(" 接收到数据（%s）：%s", ::inet_ntoa(addr.sin_addr), buff); if(strcmp(buff,"bye")==0)

break;

char szText[1024] ;

cin>>szText;

::sendto(s, szText, strlen(szText), 0, (sockaddr*)&addr, sizeof(addr)); }

}

printf("\n");

::closesocket(s);