使用WINSOCK的网络通信模拟程序

（服务器端）

最近在做嵌入式的project过程中，学习了winsock网络编程，project主要的内容是在移植到stm32之前通过c语言对整个过程进行模拟；过程包括：一台client端的设备和一台作为服务器端的sensor设备通过TCP协议进行连接，通过client端输入不同指令对sensor端进行控制：

例如start命令唤醒sensor；

唤醒后输入任意指令获得sensor端返回的温度数值（此处为随机数生成）；

唤醒后输入quit退出连接，结束模拟过程。

下面是一些说明：

1.sensor端作为服务器，代码分为通讯模块、控制模块、温度模块。

2.考虑到TCP协议通过三次握手进行连接，有助于保证sensor端和client端通信的稳定性，我们使用TCP通信替代了推荐的UDP通信，因此代码部分中大规模的代码是通讯模块。

3.控制模块是对client端的信息进行鉴别（实际上就是设置不同信号的相应优先级，因为project比较简单，此处只设置了三级响应）

4.温度模块在此代码中只是通过随机数生成的35.0-42.9之间的数值，在单片机开发板版本中为通过温度传感器检测到的实际数值。

补充：project的完整源码已经update到gitee，后续的改进将逐步进行，大家感兴趣的话可以看看gitee连接

此处鸣谢一起完成project的负责单片机部分的王同学CSDN个人空间，负责GUI部分的张同学和司马同学

此处为客户机部分文章链接/capodexi/article/details/106802557

此部分为sensor端源码

#include <stdio.h>#include<stdlib.h>#include<time.h>#include<WINSOCK2.h>#include<string.h>#include<iostream>#include<tchar.h>#pragma comment(lib,"WS2_32.lib")#define BUF_SIZE 64//设置头文件，库文件与常量（缓冲区大小）int _tmain(int argc, _TCHAR* argv[]){WSADATA wsd;SOCKET sServer;SOCKET sClient;SOCKADDR_IN servAddr;char buf[BUF_SIZE];int retVal;//声明程序所需的变量if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0){printf("WSAStartup failed! \n");return 1;}//初始化Socket环境sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (INVALID_SOCKET == sServer){printf("socket failed! \n");WSACleanup();return -1;}//创建server端的SocketSOCKADDR_IN addrServ;addrServ.sin_family = AF_INET;addrServ.sin_port = htons(9990);addrServ.sin_addr.S_un.S_addr = htonl(INADDR_ANY);//设置服务器监听地址为任意本地地址，设置端口号为9990retVal = bind(sServer, (const struct sockaddr*)&addrServ, sizeof(SOCKADDR_IN));if (retVal == SOCKET_ERROR){printf("bind failed!\n");closesocket(sServer);WSACleanup();return -1;}//绑定SocketServer到本地地址retVal = listen(sServer, 1);if (SOCKET_ERROR == retVal){printf("listen failed! \n");closesocket(sServer);WSACleanup();return -1;}//在ServerSocket上进行监听printf("TCP server socket start...\n");sockaddr_in addrClient;int addrClientlen = sizeof(addrClient);sClient = accept(sServer, (sockaddr FAR*) & addrClient, &addrClientlen);if (sClient == INVALID_SOCKET){printf("accept error!\n ");closesocket(sServer);WSACleanup();return -1;}//接受客户端请求int j = 0;printf("TCP server syart successfully!\n");while (true){ZeroMemory(buf, BUF_SIZE);retVal = recv(sClient, buf, BUFSIZ, 0);if (SOCKET_ERROR == retVal){printf("recv failed! \n");closesocket(sServer);closesocket(sClient);WSACleanup();return -1;}if (strcmp(buf, "start") != 0 && j == 0){char cls[BUF_SIZE] = "sensor has not worked yet!Please press 'start'!\n ";strcpy(buf, cls);retVal = send(sClient, buf, strlen(buf), 0);if (SOCKET_ERROR == retVal){printf("send failed! \n");closesocket(sServer);closesocket(sClient);WSACleanup();return -1;}j++;continue;}//sensor端启动命令检测if (strcmp(buf, "start") == 0||j == 0){char sta[BUF_SIZE] = "sensor start!";printf("service start!");strcpy(buf, sta);retVal = send(sClient,buf, strlen(buf), 0);if (SOCKET_ERROR == retVal){printf("send failed! \n");closesocket(sServer);closesocket(sClient);WSACleanup();return -1;}j++;continue;}//相应启动命令的输出信息if (strcmp(buf, "quit") == 0){retVal = send(sClient, "quit", strlen("quit"), 0);printf("Shutdown command recieved!");break;}//exit int p,q,r;char msg[BUF_SIZE];memset(msg, 0, sizeof(msg));p = rand() % 2 + 3;if (p==3){q = rand() % 5 + 5;}else{q = rand() % 3 + 0;}r = rand() % 10 + 0;srand((unsigned)time(NULL));msg[0]=(char)'0'+p;msg[1]=(char)'0'+q;msg[2]=46;msg[3]=(char)'0'+r;msg[4]='\0';//生成随机数，范围35.0-42.0SYSTEMTIME st;GetLocalTime(&st);printf("%4d-%2d-%2d %2d:%2d:%2d, Recv From Client [%s:%d]:%s\n",st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond,inet_ntoa(addrClient.sin_addr), addrClient.sin_port, "Temprature Sending Now");if(j>=0){retVal = send(sClient,msg, strlen(msg), 0);if (SOCKET_ERROR == retVal){printf("send failed! \n");closesocket(sServer);closesocket(sClient);WSACleanup();return -1;}}}//服务器与客户端传送信息closesocket(sServer);closesocket(sClient);WSACleanup();//释放空间system("pause");return 0;system("pause");return 0;}

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