Socket网络编程——C++版源码

╰半夏微凉° 2022-06-03 08:19 207阅读 0赞

本代码可直接使用 根据TCP/IP三次握手，实验时可使用两台电脑，或者打开两个终端模拟通信。

服务器端：

#include <stdio.h> 
    #include <iostream>
    #include <winsock2.h> 
     #include <WS2tcpip.h>
    #pragma comment(lib,"ws2_32.lib") 
      
    int main(int argc, char* argv[])  
    {   
        //初始化WSA 
        WORD sockVersion = MAKEWORD(2,2);  
        WSADATA wsaData;  
        if(WSAStartup(sockVersion, &wsaData)!=0)  
        {   
            return 0;  
        }  
      
        //创建套接字 
        SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);  
        if(slisten == INVALID_SOCKET)  
        {   
            printf("socket error !");  
            return 0;  
        }  
      
        //绑定IP和端口 
        sockaddr_in sin;  
        sin.sin_family = AF_INET;  
        sin.sin_port = htons(8888);  
        sin.sin_addr.S_un.S_addr = INADDR_ANY;   
        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[255];   
        while (true)  
        {   
            printf("等待连接...\n");  
            sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);  
            if(sClient == INVALID_SOCKET)  
            {   
                printf("accept error !");  
                continue;  
            }  
            printf("接受到一个连接：%s \r\n", inet_ntop(AF_INET, (void*)&remoteAddr.sin_addr, revData, 16));
           // printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr)); //inet_ntoa老函数在新版本VS+64位计算机上使用会报错
              
            //接收数据 
            int ret = recv(sClient, revData, 255, 0);         
            if(ret > 0)  
            {   
                revData[ret] = 0x00;  
                printf(revData);  
            }  
      
            //发送数据 
            const char * sendData = "你好，TCP客户端！\n";  
            send(sClient, sendData, strlen(sendData), 0);  
            closesocket(sClient);  
        }  
          
        closesocket(slisten);  
        WSACleanup();  
        return 0;  
    }

用户端：

#include<WINSOCK2.H>
    #include<STDIO.H>
    #include<iostream>
    #include<cstring>
    #include <WS2tcpip.h>
    using namespace std;
    #pragma comment(lib, "ws2_32.lib")
    #pragma warning(disable:4996) //如果你有inet_addr函数的报错，加上这个就解决了
    int main()
    { 
    	WORD sockVersion = MAKEWORD(2, 2);
    	WSADATA data;
    	if(WSAStartup(sockVersion, &data)!=0)
    	{ 
    		return 0;
    	}
    	while(true){ 
    		SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    		if(sclient == INVALID_SOCKET)
    		{ 
    			printf("invalid socket!");
    			return 0;
    		}
    		
    		sockaddr_in serAddr;
    		serAddr.sin_family = AF_INET;
    		serAddr.sin_port = htons(8888);
    		//serAddr.sin_addr.S_un.S_addr = inet_pton(AF_INET, "127.0.0.1", &serAddr);
    		serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");//如果你有inet_addr函数的报错，看上文
    		if(connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
    		{   //连接失败 
    			printf("connect error !");
    			closesocket(sclient);
    			return 0;
    		}
    		
    		string data;
    		cin>>data;
    		const char * sendData;
    		sendData = data.c_str();   //string转const char* 
    		//char * sendData = "你好，TCP服务端，我是客户端\n";
    		send(sclient, sendData, strlen(sendData), 0);
    		//send()用来将数据由指定的socket传给对方主机
    		//int send(int s, const void * msg, int len, unsigned int flags)
    		//s为已建立好连接的socket，msg指向数据内容，len则为数据长度，参数flags一般设0
    		//成功则返回实际传送出去的字符数，失败返回-1，错误原因存于error 
    		
    		char recData[255];
    		int ret = recv(sclient, recData, 255, 0);
    		if(ret>0){ 
    			recData[ret] = 0x00;
    			printf(recData);
    		} 
    		closesocket(sclient);
    	}
    	
    	
    	WSACleanup();
    	return 0;
    	
    }

工具->编译选项->在连接器命令行加入如下命令里面添加-lwsock32 即可

两个程序的原理本质是一样的![这里写图片描述][SouthEast]网上有很多类似的原理介绍，这里不再赘述，只需要按照这个原理图，一步步实现代码即可。

此外遇到的一些新版本VS编译的问题，在代码注释中已经给出答案了，完美运行哦~

[SouthEast]: /images/20220603/3e757d8391d74488b7dc7e1a4cf468c2.png