• 日期: 2027-04-28
  • 标签: 常规

基于SQLite和JSON的智能家居服务器设计

概述

本文将介绍如何使用Linux C语言、SQLite和JSON创建一个简单的智能家居服务器。该服务器可以接收来自QT C++客户端的请求，解析请求中的用户ID，并根据SQLite数据库中存储的最新传感器数据，提供智能家居建议。

服务器端代码 (C语言)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sqlite3.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <json-c/json.h>

#define DATABASE 'database.db'
#define PORT 5000

struct Status {
    int sid;
    int uid;
    char device_name[10];
    char device_state[10];
    char value[10];
    char mode[10];
};

void handleClientRequest(int clientSocket);
void handleTemperatureHumidity(int clientSocket, int uid);
void sendResponse(int clientSocket, const char* response);
char* getAdvice(int temperature, int humidity);

int main() {
    int serverSocket, clientSocket;
    struct sockaddr_in serverAddress, clientAddress;
    socklen_t clientAddressLength = sizeof(clientAddress);

    // 创建套接字
    serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket < 0) {
        perror('Error creating socket');
        exit(1);
    }

    // 设置服务器地址
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_addr.s_addr = INADDR_ANY;
    serverAddress.sin_port = htons(PORT);

    // 绑定套接字到指定地址和端口
    if (bind(serverSocket, (struct sockaddr*)&serverAddress, sizeof(serverAddress)) < 0) {
        perror('Error binding socket');
        exit(1);
    }

    // 监听传入连接
    if (listen(serverSocket, 5) < 0) {
        perror('Error listening for connections');
        exit(1);
    }

    printf('Server started. Listening on port %d...\n', PORT);

    while (true) {
        // 接受客户端连接
        clientSocket = accept(serverSocket, (struct sockaddr*)&clientAddress, &clientAddressLength);
        if (clientSocket < 0) {
            perror('Error accepting connection');
            exit(1);
        }

        printf('Client connected from %s:%d\n', inet_ntoa(clientAddress.sin_addr), ntohs(clientAddress.sin_port));

        // 处理客户端请求
        handleClientRequest(clientSocket);

        // 关闭客户端连接
        close(clientSocket);
        printf('Client disconnected\n');
    }

    // 关闭服务器套接字
    close(serverSocket);

    return 0;
}

void handleClientRequest(int clientSocket) {
    char buffer[1024];
    int bytesRead = read(clientSocket, buffer, sizeof(buffer));
    if (bytesRead < 0) {
        perror('Error reading from socket');
        exit(1);
    }

    // 解析JSON请求
    struct json_object* jsonRequest = json_tokener_parse(buffer);
    if (jsonRequest == NULL) {
        perror('Error parsing JSON');
        exit(1);
    }

    // 从JSON请求中获取用户ID
    struct json_object* jsonUserID;
    json_object_object_get_ex(jsonRequest, 'userid', &jsonUserID);
    int uid = json_object_get_int(jsonUserID);

    // 处理温度和湿度请求
    handleTemperatureHumidity(clientSocket, uid);

    // 清理
    json_object_put(jsonRequest);
}

void handleTemperatureHumidity(int clientSocket, int uid) {
    sqlite3* db;
    int rc = sqlite3_open(DATABASE, &db);
    if (rc != SQLITE_OK) {
        perror('Error opening database');
        exit(1);
    }

    char query[100];
    snprintf(query, sizeof(query), 'SELECT * FROM Status WHERE uid = %d', uid);

    sqlite3_stmt* stmt;
    rc = sqlite3_prepare_v2(db, query, -1, &stmt, 0);
    if (rc != SQLITE_OK) {
        perror('Error preparing statement');
        exit(1);
    }

    // 获取用户的最新温度和湿度值
    int temperature = 0;
    int humidity = 0;

    while (sqlite3_step(stmt) == SQLITE_ROW) {
        struct Status status;
        status.sid = sqlite3_column_int(stmt, 0);
        status.uid = sqlite3_column_int(stmt, 1);
        strcpy(status.device_name, (char*)sqlite3_column_text(stmt, 2));
        strcpy(status.device_state, (char*)sqlite3_column_text(stmt, 3));
        strcpy(status.value, (char*)sqlite3_column_text(stmt, 4));
        strcpy(status.mode, (char*)sqlite3_column_text(stmt, 5));

        if (strcmp(status.device_name, 'Temperature') == 0) {
            temperature = atoi(status.value);
        } else if (strcmp(status.device_name, 'Humidity') == 0) {
            humidity = atoi(status.value);
        }
    }

    // 根据温度和湿度值获取建议
    char* advice = getAdvice(temperature, humidity);

    // 将建议发送给客户端
    sendResponse(clientSocket, advice);

    // 清理
    sqlite3_finalize(stmt);
    sqlite3_close(db);
}

void sendResponse(int clientSocket, const char* response) {
    int bytesWritten = write(clientSocket, response, strlen(response));
    if (bytesWritten < 0) {
        perror('Error writing to socket');
        exit(1);
    }
}

char* getAdvice(int temperature, int humidity) {
    char* advice = (char*)malloc(100);

    if (temperature < 24) {
        snprintf(advice, 100, '空调温度过低，建议提高温度至26℃。');
    } else if (humidity < 40 || humidity > 70) {
        snprintf(advice, 100, '加湿器湿度过高或过低，建议调整加湿器湿度。');
    } else {
        snprintf(advice, 100, '目前没有建议。');
    }

    return advice;
}

客户端代码 (QT C++)

#ifndef PROCESSION_H
#define PROCESSION_H

#include <QWidget>
#include <QNetworkAccessManager>
#include <QNetworkReply>

namespace Ui {
class Procession;
}

class Procession : public QWidget
{
    Q_OBJECT

public:
    explicit Procession(int userid,QWidget *parent = nullptr);
    ~Procession();
    void processionWidget();

private slots:
    void connectToServer();//和服务器通信
    void handleServerResponse(QNetworkReply *reply);//和服务器连接回应

private:
    Ui::Procession *ui;
    int userid;
    QNetworkAccessManager *networkManager;
};

#endif // PROCESSION_H

#include 'procession.h'
#include 'ui_procession.h'
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>

//通过发送POST请求将用户ID发送到指定的服务器，并将服务器的响应显示在界面上。

Procession::Procession(int userid,QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Procession),
    userid(userid)
{
    ui->setupUi(this);
    processionWidget();
    connect(ui->connectServerBtn,&QPushButton::clicked,this,[=](){
       this->connectToServer();
    });
    connect(networkManager, &QNetworkAccessManager::finished, this, &Procession::handleServerResponse);


}

Procession::~Procession()
{
    delete ui;
}

void Procession::processionWidget()
{
    setWindowTitle('服务器通信');
    setAutoFillBackground(true);
    QPalette palette=this->palette();
    QPixmap pixmap(':user/image/image/net.jpg');
    palette.setBrush(QPalette::Window, QBrush(pixmap));
    setPalette(palette);
    setFixedSize(600,400);
}
void Procession::connectToServer()
{
    QJsonObject json;
    json['userid'] = this->userid;

    QJsonDocument doc(json);
    QByteArray postData = doc.toJson();

    QNetworkRequest request(QUrl(ui->serverIP->text()));
    request.setHeader(QNetworkRequest::ContentTypeHeader, 'application/json');

    networkManager->post(request, postData);
}

void Procession::handleServerResponse(QNetworkReply *reply)
{
    if (reply->error() == QNetworkReply::NoError) {
            QByteArray response = reply->readAll();
            ui->message->setText(response);
        } else {
            ui->message->setText('连接失败！');
        }

        reply->deleteLater();
}

数据库设计 (SQLite)

-- 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)
);

总结

本文介绍了如何使用Linux C语言、SQLite和JSON创建一个简单的智能家居服务器。该服务器能够接收来自QT C++客户端的请求，解析请求中的数据，并根据数据库中的最新信息提供智能家居建议。

基于SQLite和JSON的智能家居服务器设计

原文地址: https://www.cveoy.top/t/topic/fBFh 著作权归作者所有。请勿转载和采集!

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