Linux C语言服务器与QT C++客户端实现智能家居建议系统

本文将介绍如何使用Linux C语言编写服务器，并使用QT C++编写客户端，以实现一个简单的智能家居建议系统。该系统通过TCP通信，从客户端获取用户ID，查询SQLite数据库中的设备状态信息，并根据分析结果向客户端发送建议。

1. 数据库设计

首先，我们需要创建一个SQLite数据库，用于存储用户的智能家居设备状态信息。以下是一个简单的示例数据库：sql-- 创建用户表CREATE TABLE IF NOT EXISTS users ( uid INTEGER PRIMARY KEY AUTOINCREMENT, username varchar(10), passwd varchar(10));

-- 创建智能家居状态表CREATE TABLE IF NOT EXISTS Status ( sid INTEGER PRIMARY KEY AUTOINCREMENT, uid INTEGER , device_name varchar(10), device_state varchar(10), value varchar(10), mode varchar(10), FOREIGN KEY (uid) REFERENCES users (uid));

2. 服务器端代码 (server.c)

以下是使用Linux C语言编写的服务器端代码示例：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 DB_PATH 'database.db'

void handle_client(int client_socket, sqlite3 *db) { char buffer[1024]; char response[1024]; // 接收客户端发送的userid if (recv(client_socket, buffer, sizeof(buffer), 0) < 0) { perror('Failed to receive userid'); return; } int userid = atoi(buffer); // 查询数据库获取设备状态信息 char sql[1024]; sprintf(sql, 'SELECT device_name, value FROM Status WHERE uid = %d', userid); sqlite3_stmt *stmt; if (sqlite3_prepare_v2(db, sql, -1, &stmt, NULL) != SQLITE_OK) { perror('Failed to execute query'); return; } // 分析设备状态并生成建议 char advice[1024]; advice[0] = '�'; while (sqlite3_step(stmt) == SQLITE_ROW) { char device_name[10]; strcpy(device_name, sqlite3_column_text(stmt, 0)); int value = sqlite3_column_int(stmt, 1); if (strcmp(device_name, '空调') == 0) { if (value < 24) { strcat(advice, '空调温度过低，建议提高温度至26℃ '); } } else if (strcmp(device_name, '加湿器') == 0) { if (value < 40 || value > 70) { strcat(advice, '加湿器湿度过高或过低，建议调整加湿器湿度 '); } } } sqlite3_finalize(stmt); // 发送建议给客户端 if (strlen(advice) > 0) { strcpy(response, advice); } else { strcpy(response, '没有建议'); } if (send(client_socket, response, sizeof(response), 0) < 0) { perror('Failed to send advice'); return; } close(client_socket);}

int main() { // 创建服务器套接字 int server_socket = socket(AF_INET, SOCK_STREAM, 0); if (server_socket < 0) { perror('Failed to create socket'); return 1; } // 绑定服务器地址和端口 struct sockaddr_in server_address; server_address.sin_family = AF_INET; server_address.sin_addr.s_addr = INADDR_ANY; server_address.sin_port = htons(12345); if (bind(server_socket, (struct sockaddr*)&server_address, sizeof(server_address)) < 0) { perror('Failed to bind'); return 1; } // 监听连接请求 if (listen(server_socket, 5) < 0) { perror('Failed to listen'); return 1; } // 连接到数据库 sqlite3 db; if (sqlite3_open(DB_PATH, &db) != SQLITE_OK) { perror('Failed to connect to database'); return 1; } // 接受客户端连接并处理请求 while (1) { struct sockaddr_in client_address; socklen_t client_address_length = sizeof(client_address); int client_socket = accept(server_socket, (struct sockaddr)&client_address, &client_address_length); if (client_socket < 0) { perror('Failed to accept connection'); continue; } handle_client(client_socket, db); } // 关闭服务器套接字和数据库连接 close(server_socket); sqlite3_close(db); return 0