1、windows上加载socket库

链接输入ws2_32.lib

代码code：

#ifdef _WIN32
#include<windows.h>
#else
#include <sys/socket.h>
#include<sys/types.h>
#include<unistd.h>
#include<cstring>
#include<arpa/inet.h>
#include<netinet/in.h>
#define closesocket close
#endif
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<thread>
using namespace std;
class TcpThread
{
public:
	void Main()
	{
		char buf[1024] = { 0 };

		for (;;)
		{
			int recvlen = recv(client, buf, sizeof(buf) - 1, 0);
			if (recvlen <= 0)break;
			buf[recvlen] = '\0';
			if (strstr(buf, "quit") != NULL)
			{
				char re[] = "quit success\n";
				send(client, re, sizeof(re) + 1, 0);
				break;
			}
			int sendlen = send(client, "ok!!\n",sizeof("ok!!\n"), 0);

			printf("recv %s\n", buf);

		}
		closesocket(client);
		delete this;
	}
	int client = 0;
};
int main(int argc, char* argv[])
{
#ifdef _WIN32
	WSADATA ws;
	WSAStartup(MAKEWORD(2, 2), &ws);
#endif
	
	//调用句柄
	int sock = socket(AF_INET, SOCK_STREAM, 0);
	if (sock == -1)
	{
		printf("create socket failed\n");
		return -1;
	}
	unsigned short port = 8181;
	if (argc > 1)
	{
		port = atoi(argv[1]);
	}
	sockaddr_in saddr;
	saddr.sin_family = AF_INET;
	saddr.sin_port = htons(port);//转换字节序成网络字节序
	saddr.sin_addr.s_addr = htons(0);

	if (bind(sock, (sockaddr*)&saddr, sizeof(saddr)) != 0)
	{
		printf("bind port %d failed\n", port);
		return -2;
	}

	printf("bind port %d success\n", port);
	//printf("[%d]", sock);
	listen(sock, 10);//第二个参数位套接字请求长度
	//端口号和地址
	for (;;)
	{
		sockaddr_in caddr; //返回结构体大小和地址
#ifdef WIN32

		int len = sizeof(struct sockaddr);
#else
		socklen_t len = sizeof(caddr);
#endif
		int client = accept(sock, (sockaddr*)&caddr, &len); //这个sock建立链接
		if (client <= 0)break;
		printf("Aacept client %d\n", client);
		char* ip = inet_ntoa(caddr.sin_addr);
		unsigned short cport = ntohs(caddr.sin_port);
		printf("client ip is %s,port is %d\n", ip, port);
		TcpThread* th = new TcpThread;
		th->client = client;
		thread sth(&TcpThread::Main, th);//th入口函数
		sth.detach(); //线程分离
	}
	


	#ifdef _WIN32
	closesocket(sock);
	#else
	close(sock); 
    #endif	
	//可以 define close closesocket
	
	getchar();
	return 0;
}