C++网络通信实例（TCP/IP协议，包括服务端与客户端通信）

太过爱你忘了你带给我的痛 2023-09-30 15:22 30阅读 0赞

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**TCP/IP是当下网络协议栈中的主流协议 TCP属于传输层的协议 可靠传输 包括经典的三次握手等等**

**IP协议是网络层协议 尽全力传输但不可靠 学过计算机网络的同学们对这个应该比较熟悉**

以下是使用C++进行网络通信的实例

**服务端**

**主要使用多线程技术建立连接 也就是一个服务端可以连接多个客户端 最大连接数可以限定**

**向客户端发送字符串this is server 并启动一个线程等待客户端发送信息过来**

**如果客户端发送A过来 服务器返回B 发送C过来 服务器返回D 发送exit之后服务器关闭线程**

**效果图如下![239c7072c65a466fb05c267282acf197.png][]**

![daaf0f831bae4e6aadee60b1ac411366.jpeg][]

**代码如下**

#include<iostream>
    #include<stdlib.h>
    #include<WinSock2.h>
    #define _WINSOCK_DEPRECATED_NO_WARNINGS
    
    using namespace std;
    #pragma comment(lib, "ws2_32.lib")
    DWORD WINAPI threadpro(LPVOID pParam) {
    	SOCKET hsock = (SOCKET)pParam;
    	char buffer[1024];
    	char sendBuffer[1024];
    	if (hsock != INVALID_SOCKET)
    
    		cout << "start receive" << endl;
    	while (1)
    	{
    		int num = recv(hsock, buffer, 1024, 0);
    		if (num >= 0)
    			cout << "receive from clinet" << buffer << endl;
    		if (!strcmp(buffer, "A"))
    		{
    			memset(sendBuffer, 0, 1024);
    			strcpy_s(sendBuffer, "B");
    			int ires = send(hsock, sendBuffer, sizeof(sendBuffer), 0);//回送信息
    			cout << "send to client" << sendBuffer << endl;
    
    
    		}
    		else if (!strcmp(buffer, "C"))
    		{
    			memset(sendBuffer, 0, 1024);
    			strcpy_s(sendBuffer, "D");
    			int ires = send(hsock, sendBuffer, sizeof(sendBuffer), 0);//回送信息
    			cout << "send to client" << sendBuffer << endl;
    
    		}
    		else if (!strcmp(buffer, "exit"))
    		{
    
    			cout << "client close" << endl;
    			cout << "server process close" << endl;
    			return 0;
    		}
    		else
    		{
    			memset(sendBuffer, 0, 1024);
    			strcpy_s(sendBuffer, "ERR");
    			int ires = send(hsock, sendBuffer, sizeof(sendBuffer), 0);//回送信息
    			cout << "send to client" << sendBuffer << endl;
    
    
    		}
    		 
    	}
    	return 0;
    
    
    }
    void main() {
    	WSADATA wsd;
    	WSAStartup(MAKEWORD(2, 2), &wsd);
    	SOCKET m_SockServer;
    	sockaddr_in serveraddr;
    	sockaddr_in serveraddrfrom;
    	SOCKET m_Server[20];
    	serveraddr.sin_family = AF_INET;
    	serveraddr.sin_port = htons(4600);//端口号
    	//serveraddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    	m_SockServer = socket(AF_INET, SOCK_STREAM, 0);
    	int i = bind(m_SockServer, (sockaddr*)&serveraddr, sizeof(serveraddr));//绑定数
    	cout << "bind:" << i << endl;
    	int imaxconnect = 20;
    	int iconnect = 0;
    	int ilisret;
    	char buf[] = "this is server\0";
    	char WarnBuf[] = "it is over max connect\0";
    	int len = sizeof(sockaddr);
    	while (1) {
    		ilisret = listen(m_SockServer, 0);
    		m_Server[iconnect] = accept(m_SockServer, (sockaddr*)&serveraddrfrom, &len);
    		if (m_Server[iconnect] != INVALID_SOCKET)
    		{
    			int ires = send(m_Server[iconnect], buf, sizeof(buf), 0);
    			cout << "accept:" << ires << endl;
    			iconnect++;
    			if (iconnect > imaxconnect)
    			{
    				int ires = send(m_Server[iconnect], WarnBuf, sizeof(WarnBuf), 0);
    
    			}
    			else
    			{
    				HANDLE m_handle;
    				DWORD nThreadld = 0;
    				m_handle = (HANDLE)::CreateThread(NULL, 0, threadpro, (LPVOID)m_Server[--iconnect], 0, &nThreadld);//启动 线程
    
    
    
    			}
    
    
    
    
    		}
    
    
    		WSACleanup();
    	}
    
    }

**客户端**

#include<iostream>
    #include<stdlib.h>
    #include"winsock2.h"
    #include<time.h>
    #define _WINSOCK_DEPRECATED_NO_WARNINGS
    using namespace std;
    #pragma comment(lib,"ws2_32.lib")
    void main() {
    	WSADATA wsd;
    	WSAStartup(MAKEWORD(2, 2), &wsd);
    	SOCKET m_SockClient;
    	sockaddr_in clientaddr;
    	clientaddr.sin_family = AF_INET;
    	clientaddr.sin_port = htons(4600);
    	//clientaddr.sin_addr.S_un.S_addr =inet_addr("127.0.0.1");
    	m_SockClient = socket(AF_INET, SOCK_STREAM, 0);
    	int i = connect(m_SockClient, (sockaddr*)&clientaddr, sizeof(clientaddr));
    	cout << "connect" << i << endl;
    	char buffer[1024];
    	char inBuf[1024];
    	int num;
    	num = recv(m_SockClient, buffer, 1024, 0);
    	if (num > 0) {
    		cout << "receive from server" << buffer << endl;
    		while (1) {
    			num = 0;
    			cin >> inBuf;
    			if (!strcmp(inBuf, "exit")) {
    
    				send(m_SockClient, inBuf, sizeof(inBuf), 0);
    				return;
    
    			}
    			send(m_SockClient, inBuf, sizeof(inBuf), 0);
    			num = recv(m_SockClient, buffer, 1024, 0);
    			if (num >= 0)
    				cout << "reveive from server" << buffer << endl;
    
    
    
    
    
    		}
    
    
    
    
    
    
    
    
    	}
    
    
    
    
    
    
    
    
    }

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[239c7072c65a466fb05c267282acf197.png]: https://img-blog.csdnimg.cn/239c7072c65a466fb05c267282acf197.png
[daaf0f831bae4e6aadee60b1ac411366.jpeg]: https://img-blog.csdnimg.cn/daaf0f831bae4e6aadee60b1ac411366.jpeg