Qt C++和Linux C实现TCP/IP智能家居状态建议系统

本文介绍一个使用Qt C++开发的客户端和Linux C开发的服务器，通过TCP/IP协议进行通信，实现智能家居状态建议的系统。客户端可以连接到服务器，发送消息并接收服务器发送的建议。

数据库设计

-- 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)
);

客户端代码 (Qt C++)

#include <QtWidgets>
#include <QtNetwork>

class Client : public QWidget
{
    Q_OBJECT

public:
    Client(QWidget *parent = nullptr);

private slots:
    void connectToServer();
    void sendMessage();
    void readMessage();
    void getAdvice();

private:
    QLineEdit *serverLineEdit;
    QLineEdit *sendLineEdit;
    QLineEdit *receiveLineEdit;
    QLineEdit *adviceLineEdit;
    QPushButton *connectButton;
    QPushButton *sendButton;
    QPushButton *adviceButton;
    QTcpSocket *tcpSocket;
};

Client::Client(QWidget *parent)
    : QWidget(parent)
{
    serverLineEdit = new QLineEdit;
    sendLineEdit = new QLineEdit;
    receiveLineEdit = new QLineEdit;
    adviceLineEdit = new QLineEdit;
    connectButton = new QPushButton('Connect');
    sendButton = new QPushButton('Send');
    adviceButton = new QPushButton('Get Advice');
    tcpSocket = new QTcpSocket(this);

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(serverLineEdit);
    layout->addWidget(connectButton);
    layout->addWidget(sendLineEdit);
    layout->addWidget(sendButton);
    layout->addWidget(receiveLineEdit);
    layout->addWidget(adviceButton);
    layout->addWidget(adviceLineEdit);
    setLayout(layout);

    connect(connectButton, &QPushButton::clicked, this, &Client::connectToServer);
    connect(sendButton, &QPushButton::clicked, this, &Client::sendMessage);
    connect(tcpSocket, &QTcpSocket::readyRead, this, &Client::readMessage);
    connect(adviceButton, &QPushButton::clicked, this, &Client::getAdvice);
}

void Client::connectToServer()
{
    QString serverAddress = serverLineEdit->text();
    tcpSocket->connectToHost(serverAddress, 1234);
}

void Client::sendMessage()
{
    QString message = sendLineEdit->text();
    tcpSocket->write(message.toUtf8());
    sendLineEdit->clear();
}

void Client::readMessage()
{
    QString message = tcpSocket->readAll();
    receiveLineEdit->setText(message);
}

void Client::getAdvice()
{
    tcpSocket->write('GET_ADVICE');
}

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

    Client client;
    client.show();

    return app.exec();
}

#include 'main.moc'

服务器代码 (Linux C)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define MAX_BUFFER_SIZE 1024

void sendAdvice(int clientSocket)
{
    // 获取最新的智能家居状态表数据，根据条件制定建议
    // 这里只是一个示例，实际情况需要根据数据库查询结果来生成建议
    char advice[MAX_BUFFER_SIZE];
    strcpy(advice, 'Air conditioner temperature is too low, please increase the temperature to 26°C. Humidifier humidity is too high or too low, please adjust the humidity.');

    write(clientSocket, advice, strlen(advice));
}

int main()
{
    int serverSocket, clientSocket;
    struct sockaddr_in serverAddress, clientAddress;
    socklen_t clientAddressLength;
    char buffer[MAX_BUFFER_SIZE];

    // 创建服务器套接字
    serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket == -1)
    {
        perror('Failed to create socket');
        exit(EXIT_FAILURE);
    }

    // 设置服务器地址
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_addr.s_addr = INADDR_ANY;
    serverAddress.sin_port = htons(1234);

    // 绑定服务器套接字到指定地址和端口
    if (bind(serverSocket, (struct sockaddr *)&serverAddress, sizeof(serverAddress)) == -1)
    {
        perror('Failed to bind socket');
        exit(EXIT_FAILURE);
    }

    // 开始监听连接请求
    if (listen(serverSocket, 5) == -1)
    {
        perror('Failed to listen');
        exit(EXIT_FAILURE);
    }

    printf('Server started, waiting for connections...\n');

    while (1)
    {
        // 接受客户端连接请求
        clientAddressLength = sizeof(clientAddress);
        clientSocket = accept(serverSocket, (struct sockaddr *)&clientAddress, &clientAddressLength);
        if (clientSocket == -1)
        {
            perror('Failed to accept connection');
            exit(EXIT_FAILURE);
        }

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

        while (1)
        {
            // 接收客户端消息
            ssize_t bytesRead = read(clientSocket, buffer, sizeof(buffer));
            if (bytesRead <= 0)
            {
                printf('Client disconnected: %s\n', inet_ntoa(clientAddress.sin_addr));
                break;
            }

            buffer[bytesRead] = '\0';
            printf('Received message from client: %s\n', buffer);

            // 处理客户端消息
            if (strcmp(buffer, 'GET_ADVICE') == 0)
            {
                sendAdvice(clientSocket);
            }
        }

        close(clientSocket);
    }

    close(serverSocket);

    return 0;
}

程序功能

客户端连接服务器，发送消息并接收服务器消息
客户端可以发送 'GET_ADVICE' 请求获取服务器建议
服务器接收客户端请求，并根据预设逻辑发送建议信息

注意

以上代码仅供参考，实际应用需根据具体需求修改完善
服务器端代码中获取智能家居状态数据部分需要根据实际数据库进行修改
建议使用数据库连接池等技术优化数据库访问