设备状态建议服务：基于SQLite数据库和网络通信的智能家居解决方案

该项目提供了一个基于SQLite数据库和网络通信的设备状态建议服务。该服务可以接收用户的请求，查询设备状态信息，并根据设备类型和状态提供相应的建议。

**1. 代码结构和功能:**c#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <sys/socket.h>#include <arpa/inet.h>#include <sqlite3.h>

#define MAX_BUFFER_SIZE 1024

// 设备状态结构体typedef struct { int uid; char device_name[10]; char device_state[10]; char value[10]; char mode[10];} Status;

// 服务器上下文结构体，包含服务器相关信息typedef struct { int sockfd; struct sockaddr_in client_addr; socklen_t client_addr_len; sqlite3 *db;} ServerContext;

// 处理客户端请求void handleClientRequest(ServerContext *context) { char buffer[MAX_BUFFER_SIZE]; int userid;

// 接收客户端发送的userid    ssize_t recvSize = recv(context->sockfd, &userid, sizeof(int), 0);    if (recvSize == -1) {        perror('recv');        return;    }

// 查询数据库获取设备状态信息    char sql[100];    snprintf(sql, sizeof(sql), 'SELECT * FROM Status WHERE uid = %d', userid);    sqlite3_stmt *stmt;    int rc = sqlite3_prepare_v2(context->db, sql, -1, &stmt, NULL);    if (rc != SQLITE_OK) {        fprintf(stderr, 'Failed to execute statement: %s

', sqlite3_errmsg(context->db)); return; }

Status status;    rc = sqlite3_step(stmt);    if (rc == SQLITE_ROW) {        status.uid = sqlite3_column_int(stmt, 1);        strncpy(status.device_name, sqlite3_column_text(stmt, 2), sizeof(status.device_name));        strncpy(status.device_state, sqlite3_column_text(stmt, 3), sizeof(status.device_state));        strncpy(status.value, sqlite3_column_text(stmt, 4), sizeof(status.value));        strncpy(status.mode, sqlite3_column_text(stmt, 5), sizeof(status.mode));    } else if (rc == SQLITE_DONE) {        fprintf(stderr, 'No data found for user %d

', userid); sqlite3_finalize(stmt); return; } else { fprintf(stderr, 'Failed to execute statement: %s ', sqlite3_errmsg(context->db)); sqlite3_finalize(stmt); return; } sqlite3_finalize(stmt);

// 分析设备状态并生成建议    char suggestion[MAX_BUFFER_SIZE];    if (strcmp(status.device_name, '空调') == 0) {        int temperature = atoi(status.value);        if (temperature < 24) {            snprintf(suggestion, sizeof(suggestion), '空调温度过低，建议提高温度至26℃');        } else {            snprintf(suggestion, sizeof(suggestion), '空调温度正常');        }    } else if (strcmp(status.device_name, '加湿器') == 0) {        int humidity = atoi(status.value);        if (humidity < 40 || humidity > 70) {            snprintf(suggestion, sizeof(suggestion), '加湿器湿度过高或过低，建议调整加湿器湿度');        } else {            snprintf(suggestion, sizeof(suggestion), '加湿器湿度正常');        }    } else {        snprintf(suggestion, sizeof(suggestion), '设备状态未知');    }

// 向客户端发送建议    ssize_t sendSize = send(context->sockfd, suggestion, strlen(suggestion), 0);    if (sendSize == -1) {        perror('send');        return;    }}

// 处理客户端连接void handleClientConnection(ServerContext *context) { int clientSockfd = accept(context->sockfd, (struct sockaddr *)&context->client_addr, &context->client_addr_len); if (clientSockfd == -1) { perror('accept'); return; }

context->sockfd = clientSockfd;    handleClientRequest(context);

close(clientSockfd);}

int main() { // 创建套接字 int sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd == -1) { perror('socket'); return 1; }

// 设置服务器地址    struct sockaddr_in server_addr;    server_addr.sin_family = AF_INET;    server_addr.sin_addr.s_addr = INADDR_ANY;    server_addr.sin_port = htons(12345);

// 绑定套接字到服务器地址    if (bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {        perror('bind');        close(sockfd);        return 1;    }

// 监听连接请求    if (listen(sockfd, 5) == -1) {        perror('listen');        close(sockfd);        return 1;    }

// 打开数据库    sqlite3 *db;    int rc = sqlite3_open('database.db', &db);    if (rc != SQLITE_OK) {        fprintf(stderr, 'Failed to open database: %s

', sqlite3_errmsg(db)); close(sockfd); return 1; }

// 初始化服务器上下文    ServerContext context;    context.sockfd = sockfd;    context.client_addr_len = sizeof(context.client_addr);    context.db = db;

// 循环处理客户端连接    while (1) {        handleClientConnection(&context);    }

// 关闭数据库    rc = sqlite3_close(db);    if (rc != SQLITE_OK) {        fprintf(stderr, 'Failed to close database: %s

', sqlite3_errmsg(db)); return 1; }

// 关闭套接字    if (close(sockfd) == -1) {        perror('close');        return 1;    }

return 0