Socket programming demo II

1、 establish main.cpp

#include <stdlib.h>
#include "XTcp.h"
#include <thread>
#include <string.h>

class TcpThread {
    
public:
	void Main() {
    
		//windows  It's not read Of 
		char buf[1024] = {
     0 };
		while (true) {
    
			int recvlen = clientFd.Recv( buf, sizeof(buf) - 1);// fd buffer  size  flag
			if (recvlen <= 0) {
    
				break;
			}
			buf[recvlen] = '\n';
			if (strstr(buf, "quit") != NULL) {
    
				char re[] = "quit success!\n";
				clientFd.Send(re, strlen(re) + 1);
				printf("exit;");
				break;
			}
			int sendlen = clientFd.Send( "ok\n", 3);
			// recv/send There is no guarantee that all data will be received or sent 
			printf("sendlen:%d\n", sendlen);
			printf("recv %s\n", buf);
		}
		clientFd.Close();
		delete this;

	}
	XTcp clientFd;
};


int main(int argc, char* argv[]) {
    

	unsigned short port = 8080;
	if (argc > 1) {
    
		port = atoi(argv[1]);// Read the command line arguments 
	}
	XTcp server;
	server.CreateSocket();
	server.Bind(port);

	for (;;) {
    
		XTcp client = server.Accept();

		TcpThread* th = new TcpThread;
		th->clientFd = client;
		std::thread sth(&TcpThread::Main, th);
		sth.detach();// The main thread releases the resources of the sub threads owned by the main thread , The business logic is handed over to the child thread 
	}
	server.Close();
	//char c = getchar();
	return 0;
}

2、 establish XTcp.h

#pragma once
#include <string>

class XTcp
{
    
public:
	int CreateSocket();
	bool Bind(unsigned short port);
	XTcp Accept();
	void Close();
	int Recv(char *buf,int bufsize);
	int Send(const char *buf,int bufsize);
	XTcp();
	virtual ~XTcp();
	int socketFd = 0;
	unsigned short port = 0;
	std::string ip;
};

3、 establish XTcp.cpp

#include "XTcp.h"
#include<stdio.h>
#include <string.h>
#ifdef _WIN64
#include<ws2tcpip.h>
#include<Windows.h>
#define _WINSOCK_DEPRECATED_NO_WARNINGS

#else
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#define closesocket close
#endif 
#include <thread>
using namespace std;
XTcp::XTcp() {
    
#ifdef _WIN64
	static bool first = true;
	if (first) {
    
		first = false;
		WSADATA ws;
		WSAStartup(MAKEWORD(2, 2), &ws);
	}
#endif
}

int XTcp::CreateSocket() {
    
	//  Cause binding error 
	//int socketFd = socket(AF_INET, SOCK_STREAM, 0);
	socketFd = socket(AF_INET, SOCK_STREAM, 0);
	if (socketFd == -1) {
    
		printf("created socket failed!\n");
		return -1;
	}
	return socketFd;

}

bool XTcp::Bind(unsigned short port) {
    

	if (socketFd == 0) {
    
		CreateSocket();
	}
	sockaddr_in saddr;
	saddr.sin_family = AF_INET;
	saddr.sin_port = htons(port);// Convert local byte order to network byte order 
	saddr.sin_addr.s_addr = htonl(0);


	int bindRes = ::bind(socketFd, (sockaddr*)&saddr, sizeof(saddr));
	if (bindRes != 0) {
    

		printf("bind port %d failed!\n", port);
		return false;
	}
	printf("bind port %d success!\n", port);
	listen(socketFd, 10);//10 Linked queues , wait for accept The maximum waiting queue for processing 

	return true;

}
XTcp XTcp::Accept() {
    
	XTcp tcp;
	sockaddr_in caddr;
	//int len = 0;
	socklen_t len = sizeof(caddr);
	int clientFd = accept(socketFd, (sockaddr*)&caddr, &len);//  Corresponding request client Of socketFd, Can be used to read the corresponding client The data of 
	if (clientFd < 0) return tcp;
	printf("accept client %d\n", clientFd);
	tcp.ip = inet_ntoa(caddr.sin_addr); // Convert to string 
	tcp.port = ntohs(caddr.sin_port);
	tcp.socketFd = clientFd;
	printf("client ip is %s,port is %d \n", tcp.ip.c_str(), tcp.port);

	return tcp;
}
void XTcp::Close() {
    
	if (socketFd <= 0) {
    
		closesocket(socketFd);
	}
};
int XTcp::Recv(char* buf, int bufsize) {
    

	return recv(socketFd, buf, bufsize, 0);
}

int XTcp::Send(const char* buf, int bufsize) {
    
	int slen = 0;
	while (slen != 0) {
    
		int len = send(socketFd, buf + slen, bufsize - slen, 0);
		if (len <= 0) {
    
			break;
		}
		slen += len;

	}
	return slen;


}

XTcp::~XTcp() {
    
}

4、 establish makefile file

tcpserver:main.cpp XTcp.cpp XTcp.h
        g++ XTcp.cpp main.cpp -o tcpserver -std=c++11 -lpthread

5、 perform make

sudo make

6、 Start server

./tcpserver 

7、 Test connection

telnet 192.168.3.15 8080