Under the Windows socket (TCP) console program

window下socket（TCP）控制台程序

Create two console projects,利用套接字,Understand the workflow of sockets

• server端

#include<iostream>
#include <winsock2.h> 

using namespace std;

#pragma comment(lib,"ws2_32.lib") //链接库 

int main(int argc, char* argv[])
{
    
	//初始化网络环境
	WORD sockVersion = MAKEWORD(2, 2);//socket版本
	WSADATA wsaData;
	if (WSAStartup(sockVersion, &wsaData) != 0)
	{
    
		return 0;
	}
	//创建listen套接字 
	SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);//协议;指定socket类型;指定协议
	if (slisten == INVALID_SOCKET)
	{
    
		printf("socket error !");
		return 0;
	}
	//绑定IP和端口 
	sockaddr_in sin;
	sin.sin_family = AF_INET;//协议
	sin.sin_port = htons(999);//端口
	sin.sin_addr.S_un.S_addr = INADDR_ANY;//ip地址 Refers to all of the machineip
	if (bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
	{
    
		printf("bind error !");
	}
	//开始监听 
	if (listen(slisten, 5) == SOCKET_ERROR)
	{
    
		printf("listen error !");
		return 0;
	}
	//循环接收数据 
	SOCKET sClient;
	sockaddr_in remoteAddr;
	int nAddrlen = sizeof(remoteAddr);
	char revData[1024];
	while (true)
	{
    
		printf("listen...\n");
		sClient = accept(slisten, (SOCKADDR*)&remoteAddr, &nAddrlen);//The last two parameters are returned by the client respectivelyinternet地址
		if (sClient == INVALID_SOCKET)
		{
    
			printf("accept error !");
			continue;//接收失败,Loop again waiting for a connection
		}
		//接收数据 
		int ret = recv(sClient, revData, 255, 0);
		if (ret > 0)
		{
    
			revData[ret] = 0x00;
			cout << revData;
		}
		//发送数据 
		const char* sendData = "server:connected right\n";
		send(sClient, sendData, strlen(sendData), 0);
		closesocket(sClient);//Close the current client socket when the session is complete
	}
	closesocket(slisten);
	WSACleanup();//Clean up the network environment
	return 0;
}

• client端

#include <winsock2.h> 
#include <WS2tcpip.h>
#include<iostream>
#include<string>

using namespace std;

#pragma comment(lib, "ws2_32.lib")

int main()
{
    
	WORD sockVersion = MAKEWORD(2, 2);
	WSADATA data;
	if (WSAStartup(sockVersion, &data) != 0)
	{
    
		return 0;
	}
	sockaddr_in serAddr;
	serAddr.sin_family = AF_INET;
	serAddr.sin_port = htons(999);
	inet_pton(AF_INET, "127.0.0.1", &serAddr.sin_addr);//ip地址转换

	printf("print a string to connect the sever\n");
	string CONNECT;
	while (cin>>CONNECT)
	{
    
		SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		if (sclient == INVALID_SOCKET)
		{
    
			printf("invalid socket!");
			return 0;
		}
		if (connect(sclient, (sockaddr*)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
		{
      //连接失败 
			printf("connect error !");
			closesocket(sclient);
			return 0;
		}
		send(sclient, "client: connect request\n", strlen("client: connect request\n"), 0);
		char recData[255];
		int ret = recv(sclient, recData, 255, 0);
		if (ret > 0) {
    
			recData[ret] = 0x00;
			printf(recData);
		}
		closesocket(sclient);
	}
	WSACleanup();
	return 0;
}

基于vs2019,Start multiple projects under the same solution at the same time.