socket通讯
作者:互联网
服务端
WORD wVersionRequested;
WSADATA wsaData;
// 初始化socket
wVersionRequested = MAKEWORD(2, 2);
if(0 != WSAStartup(wVersionRequested, &wsaData))
{
printf("WSAStartup Failed \n");
printf("WSAStartup Error = %d \n", WSAGetLastError());
return 1; // 代表失败
}
/**
* AF_INET 地址族,使用IP(Internet procotl)协议
* SOCK_STREAM 使用TCP
* 最后一个参数指定协议,6是TCP ,17UDP
*/
SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); // 成功返回socket ID,失败返回INVALID_SOCKET
if (s == INVALID_SOCKET)
{
printf("Failed socket\n");
printf("Socket Error = %d\n", WSAGetLastError()); // 返回错误号
return -1;
}
else
{
printf("创建用于监听的套接口,套接口号:[%u]\n", s);
}
// 绑定使用bind()
struct sockaddr_in Sadd; // 描述本机的端口和IP地址;
Sadd.sin_family = AF_INET; // AF_INET 地址族,使用IP(Internet procotl)协议
Sadd.sin_port = htons(5555); // 端口号,字节序转换函数,把给定系统所采用的字节序称为主机字节序;为了避免不同主机之间的交换数据时对字节序解释不同而导致错误
Sadd.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");//地址转换函数,返回 32 位地址;
if (SOCKET_ERROR == bind(s, (sockaddr*)&Sadd, sizeof(Sadd))) // 如果错误返回SOCKET_ERROR
{
closesocket(s);
return WSAGetLastError();
}
else
{
printf("绑定成功\n");
printf("本地Ip地址:[%s],本地端口号:[%u]\n", inet_ntoa(Sadd.sin_addr), ntohs(Sadd.sin_port));
}
//监听状态
if (SOCKET_ERROR == listen(s, 2)) //int status = listen(socket_id,3) 3指定了正在等待连接的最大队列长度
{
printf("Failed listen()\n");
printf("listen Error=%d\n", WSAGetLastError());
}
//循环接受客户的连接请求
struct sockaddr_in Cadd;
int caddLen = sizeof(Cadd);
SOCKET c;
while (TRUE)
{
printf("进入监听状态.....\n\n");
c = accept(s, (sockaddr*)& Cadd, &caddLen); // SOCKET child_sock = accept(socket_id,(struct sockaddr_in*)client_addr,sizeof(child_addr));if error 返回INVALID_SOCKET
if (c == INVALID_SOCKET)
{
printf("Failed accept()\n");
printf("accept Error=%d\n", WSAGetLastError());
}
else
printf("可以在套接口[%u]上发送接收数据了!\n", c);
//开始发送、接收 注意都要在新套接口c上进行
//结束发送、接收
char buffer[32];
recv(c, buffer, 32, 0);
printf("%s\n",buffer);
closesocket(c);
printf("与主机IP地址是:[%s]\n|端口号是:[%u]的连接完毕\n", inet_ntoa(Cadd.sin_addr), ntohs(Cadd.sin_port));
char xx;
printf("\n需要退出吗?(Y\n)");
scanf("%c", &xx);
if (xx == 'Y' || xx == 'y')
{
break;
}
}
closesocket(s);
WSACleanup(); // 结束之前,调用WSACleanup()
return 0;
客户端
WORD wVersionRequested;
WSADATA wsaData;
int err;
//初始化socket资源
wVersionRequested = MAKEWORD(2, 2);
err = WSAStartup(wVersionRequested, &wsaData);
if(err != 0)
{
printf("WSAStartup Failed\n");
printf("WSAStartup Error=%d\n", WSAGetLastError());
return 1;
}
//创建用于监听的流式套接口s,使用socket()
//AF_INET决定了要用ipv4地址
//SOCK_STREAM流式Socket
SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s == INVALID_SOCKET)
{
printf("Failed socket\n");
printf("socket Error=%d\n", WSAGetLastError());
}
else
printf("已创建用于监听的套接口,套接口号:[%u]\n", s);
//本地地址bind(可以不做这部分,如果不绑定,系统将自动分配)
struct sockaddr_in Cadd;
Cadd.sin_family=AF_INET;
Cadd.sin_port=htons(4444);
Cadd.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
if (bind(s,(sockaddr*)&Cadd,sizeof(Cadd))==SOCKET_ERROR)
{
printf("Failed bind()/n");
}
//要连接的服务器地址信息
struct sockaddr_in Sadd;
Sadd.sin_family = AF_INET;
Sadd.sin_port = htons(5555);
Sadd.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
//将套接口s与远程主机相连
if (connect(s, (sockaddr*)& Sadd, sizeof(Sadd)) == INVALID_SOCKET)
{
printf("Failed connect()\n");
printf("connect Error=%d\n", WSAGetLastError());
}
else
{
//开始发接数据
printf("连接成功,可以开始发送接收数据了!\n");
printf("服务器IP地址:[%s]\n 端口号:[%u]\n", inet_ntoa(Sadd.sin_addr), ntohs(Sadd.sin_port));
send(s,"hello",strlen("hello")+1,0);
//结束发接数据
}
//关闭套接字s,终止对动态链接库的访问
closesocket(s);
printf("连接完毕\n");
WSACleanup();
return 0;
标签:addr,通讯,Sadd,SOCKET,printf,sin,socket 来源: https://www.cnblogs.com/xiongyungang/p/11111778.html