1.初始化网络库

bool init_Socket();


bool init_Socket()
{
	WSADATA wsadata;
	if (0 != WSAStartup(MAKEWORD(2, 2), &wsadata)) // windows异步套接字
	{
		printf("启动网络库失败 %d", WSAGetLastError());
		return false;
	}
		
	return true;
}

2.创建服务器socket

SOCKET create_serverSocket();

SOCKET create_serverSocket()
{
	SOCKET fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (INVALID_SOCKET == fd)
	{
		printf("create socket error");
		return INVALID_SOCKET;
	}
	//2.给socket 绑定IP地址和端口号
	struct sockaddr_in addr;
	addr.sin_family = AF_INET;
	addr.sin_port = htons( PORT);
	addr.sin_addr.S_un.S_addr = ADDR_ANY;

	if (SOCKET_ERROR == bind(fd, (struct socketaddr*)&addr, sizeof(addr)))
	{
		return INVALID_SOCKET;
	}
	//开始监听
	listen(fd, 10);


	return fd;
}

3.创建客户端socket

SOCKET  create_clientSocket(const char* ip)
{
	SOCKET fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (INVALID_SOCKET == fd)
	{
		printf("Client socket error");
		return INVALID_SOCKET;
	}
	//2.给socket 绑定服务IP和端口号
	struct sockaddr_in addr;
	addr.sin_family = AF_INET;
	addr.sin_port = htons(PORT);
	addr.sin_addr.S_un.S_addr = inet_addr(ip);//绑定服务器IP
	if (INVALID_SOCKET == connect(fd, &addr, sizeof(addr)))
	{
		printf("connect error");
		return INVALID_SOCKET;
	}
	
	return fd;

}

4.关闭网络库

bool close_Socket()
{
	if (0 != WSACleanup())
	{
		printf("关闭网络库失败 %d", WSAGetLastError());
		return false;
	}
	return true;
}

接下来是 创建服务器端  和客户端

服务器：

int  main()
{
	init_Socket();

	SOCKET serfd = create_serverSocket();

	printf("server creat successed ,wait client connect...\n");
	//等待客户端连接
	SOCKET clifd = accept(serfd, NULL, NULL);

	if (clifd == INVALID_SOCKET)\
	{
		printf("连接失败");

	}
	printf("友好的问候一下");
	//可以和客户端通信

	sendFile(clifd,"../Test.txt");
    
	closesocket(clifd);
	closesocket(serfd);
	close_Socket();

	return 0;
}

客户端：

int main()
{
	init_Socket();

	SOCKET  fd = create_clientSocket("127.0.0.1");

	printf("连接 服务器成功。。。。");

	recvFile(fd, "test.txt");

	closesocket(fd);
	close_Socket();
	getchar();
	return 0;

}

最后启动服务器  在启动客户端进行通信；

具体代码见：https://github.com/w1315/w1315https://github.com/w1315/w1315