六步创建TCP服务端

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//六步创建TCP服务端
#include<iostream>
#include<Windows.h>
using namespace std;

int main()
{
	//初始化ws2_32.dll
	WORD ver = MAKEWORD(2, 2);
	WSADATA wsaData;
	WSAStartup(ver, &wsaData);//对应WSACleanup的调用
	//1.建立一个socket
	SOCKET _sock = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (_sock == INVALID_SOCKET)
	{
		cout<<"创建socket失败" << endl;
		WSACleanup();
		return 0;

	}
	else
	{
		cout << "创建socket成功" << endl;
	}
	//填充sockaddr_in结构
	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(1234);
	sin.sin_addr.S_un.S_addr = INADDR_ANY;
	//2.绑定端口
	if (bind(_sock, (sockaddr*)&sin, sizeof(sin)) == SOCKET_ERROR)
	{
		cout << "绑定端口失败" << endl;
		WSACleanup();
		return 0;
	}
	else
	{
		cout << "绑定端口成功" << endl;
	}
	//3.Listen监听网络端口
	if (listen(_sock, 10) == SOCKET_ERROR)
	{
		cout << "监听端口失败" << endl;
		WSACleanup();
		return 0;
	}
	else
	{
		cout << "监听端口成功" << endl;
	}
	//4.accept等待客户端连接
	sockaddr_in clientAddr;
	int nAddrLen= sizeof(clientAddr);
	SOCKET client;
	char buf[] = "Hello,I am Server.";
	while (true)
	{
		client = accept(_sock, (sockaddr*)&clientAddr, &nAddrLen);
		if (client == INVALID_SOCKET)
		{
			cout << "接受到无效客户端" << endl;
			WSACleanup();
			return 0;
		}
		else
		{
			cout << "接受客户端连接成功" << endl;
		}
		cout << "新客户端连接IP： " << inet_ntoa(clientAddr.sin_addr) << endl;

		//5.send向客户端发送一条数据
		send(client, buf, strlen(buf) + 1, 0);
	}

	//6.关闭套接字closesocket
	closesocket(client);
	closesocket(_sock);

	//清楚windows socket环境
	WSACleanup();
	system("pause");
	return 0;
}