智能家居状态监控系统：服务器与客户端通信实现

以下是一个简单的示例代码，展示了如何使用Linux C语言编写服务器和使用QT C++编写客户端，实现智能家居状态监控系统。服务器与客户端通过TCP通信，服务器从数据库获取设备状态信息并进行分析，给出建议，并将建议传递给客户端。请注意，这只是一个基本的框架，您可能需要根据您的具体需求进行修改和扩展。

服务器端 (server.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 PORT 8080
#define DB_FILE 'database.db'

// 回调函数用于处理查询结果
int callback(void *data, int argc, char **argv, char **azColName) {
    // 处理查询结果
    // 根据需要进行相应的操作
    return 0;
}

int main() {
    int server_fd, new_socket, valread;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[1024] = {0};

    // 创建服务器套接字
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror('socket failed');
        exit(EXIT_FAILURE);
    }

    // 设置服务器套接字选项
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror('setsockopt failed');
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    // 绑定服务器套接字到指定地址和端口
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror('bind failed');
        exit(EXIT_FAILURE);
    }

    // 监听连接请求
    if (listen(server_fd, 3) < 0) {
        perror('listen failed');
        exit(EXIT_FAILURE);
    }

    // 连接数据库
    sqlite3 *db;
    if (sqlite3_open(DB_FILE, &db) != SQLITE_OK) {
        fprintf(stderr, 'Cannot open database: %s\n', sqlite3_errmsg(db));
        return 1;
    }

    // 接受客户端连接并处理请求
    while (1) {
        if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t *)&addrlen)) < 0) {
            perror('accept failed');
            exit(EXIT_FAILURE);
        }

        // 读取客户端发送的数据
        valread = read(new_socket, buffer, 1024);

        // 处理客户端请求，根据需要进行相应的操作
        // 比如根据userid查询数据库中的设备状态信息并进行分析得出建议

        // 执行SQL查询
        char sql[100];
        sprintf(sql, 'SELECT device_name, value FROM Status WHERE uid = %s', buffer);
        if (sqlite3_exec(db, sql, callback, NULL, NULL) != SQLITE_OK) {
            fprintf(stderr, 'SQL error: %s\n', sqlite3_errmsg(db));
        }

        // 发送建议给客户端
        char suggestion[100] = '空调温度过低，建议提高温度至26℃；加湿器湿度过高或过低，建议调整加湿器湿度';
        send(new_socket, suggestion, strlen(suggestion), 0);

        // 关闭套接字
        close(new_socket);
    }

    // 关闭数据库连接
    sqlite3_close(db);

    return 0;
}

客户端头文件 (client.h)

#ifndef CLIENT_H
#define CLIENT_H

#include <QObject>
#include <QTcpSocket>

class Client : public QObject
{
    Q_OBJECT
public:
    explicit Client(QObject *parent = nullptr);

signals:
    void connectionSuccess();
    void connectionFailed();
    void suggestionReceived(QString suggestion);

public slots:
    void connectToServer();
    void readData();

private:
    QTcpSocket *socket;
};

#endif // CLIENT_H

客户端实现文件 (client.cpp)

#include 'client.h'

Client::Client(QObject *parent) : QObject(parent)
{
    socket = new QTcpSocket(this);
    connect(socket, SIGNAL(connected()), this, SIGNAL(connectionSuccess()));
    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SIGNAL(connectionFailed()));
    connect(socket, SIGNAL(readyRead()), this, SLOT(readData()));
}

void Client::connectToServer()
{
    socket->connectToHost('127.0.0.1', 8080); // 服务器的IP地址和端口号
}

void Client::readData()
{
    QByteArray data = socket->readAll();
    QString suggestion = QString::fromUtf8(data);
    emit suggestionReceived(suggestion);
}

主函数文件 (main.cpp)

#include <QApplication>
#include <QTextEdit>
#include <QPushButton>
#include 'client.h'

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QTextEdit textEdit;
    QPushButton button('Connect');

    Client client;
    QObject::connect(&button, &QPushButton::clicked, &client, &Client::connectToServer);
    QObject::connect(&client, &Client::connectionSuccess, [&textEdit]() {
        textEdit.append('Connection successful');
    });
    QObject::connect(&client, &Client::connectionFailed, [&textEdit]() {
        textEdit.append('Connection failed');
    });
    QObject::connect(&client, &Client::suggestionReceived, [&textEdit](QString suggestion) {
        textEdit.append(suggestion);
    });

    textEdit.show();
    button.show();

    return a.exec();
}

请注意，以上代码只是一个简单示例，可能不会完全满足您的需求。您可能需要根据您的具体需求进行修改和扩展。此外，还需要确保在编译和运行代码之前已经安装了SQLite和QT库。