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buzzer.h

#ifndef BUZZER_H
#define BUZZER_H

// 引入必要的头文件
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>

// 定义常量
#define PWM_IOCTL_SET_FREQ 1
#define PWM_IOCTL_STOP 0
#define BUZZER_FREQ 1000  // 固定频率 1000 Hz

// 函数声明
void open_buzzer(void);
void close_buzzer(void);

#endif // BUZZER_H

buzzer.cpp

#include "buzzer.h"

static int fd = -1; // 将 fd 变量定义为静态，避免重定义

// 打开蜂鸣器并设置频率为 1000 Hz
void open_buzzer(void) {
    fd = open("/dev/pwm", O_RDWR);
    if (fd < 0) {
        perror("打开 pwm_buzzer 设备");
        exit(1);
    }

    // 设置蜂鸣器频率为 1000 Hz
    int ret = ioctl(fd, PWM_IOCTL_SET_FREQ, BUZZER_FREQ);
    if (ret < 0) {
        perror("设置蜂鸣器频率");
        close(fd);
        exit(1);
    }

    // 发声 500 ms 后关闭蜂鸣器
    usleep(500 * 1000); // 500毫秒
    if (ioctl(fd, PWM_IOCTL_STOP) < 0) {
        perror("关闭蜂鸣器");
    }
    close(fd);
    fd = -1; // 确保 fd 被重置
}

// 关闭蜂鸣器
void close_buzzer(void) {
    if (fd >= 0) {
        ioctl(fd, PWM_IOCTL_STOP);
        close(fd);
        fd = -1;
    }
}

main.cpp

#include <QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    MainWindow w(0); // 显式传递0
    w.show();
    return a.exec();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QSqlDatabase>
#include <QSqlTableModel>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow {
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_addButton_clicked();
    void on_editButton_clicked();
    void on_deleteButton_clicked();

private:
    Ui::MainWindow *ui;
    QSqlDatabase db;
    QSqlTableModel *model;
    void setupDatabase();
    void setupModel();
    void stopBuzzer();
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QSqlQuery>
#include <QSqlError>
#include <QInputDialog>
#include <QMessageBox>
#include <QSqlTableModel>
#include "buzzer.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow) {
    ui->setupUi(this);
    setupDatabase();
    setupModel();
}

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

void MainWindow::setupDatabase() {
    db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("accountbook.db");
    if (!db.open()) {
        QMessageBox::critical(this, "数据库错误", db.lastError().text());
    }

    QSqlQuery query;
    query.exec("CREATE TABLE IF NOT EXISTS accounts (id INTEGER PRIMARY KEY AUTOINCREMENT, description TEXT, amount REAL)");
}

void MainWindow::setupModel() {
    model = new QSqlTableModel(this);
    model->setTable("accounts");
    model->select();
    ui->tableView->setModel(model);

    // 设置description字段为选择框
    ui->comboBox->addItem("美食");
    ui->comboBox->addItem("游戏");
    ui->comboBox->addItem("娱乐");
    ui->comboBox->addItem("学习");
    ui->comboBox->addItem("工作");
    ui->comboBox->addItem("其他");
}

void MainWindow::on_addButton_clicked() {
    QString description = ui->comboBox->currentText();
    double amount = QInputDialog::getDouble(this, "添加条目", "金额:");

    QSqlQuery query;
    query.prepare("INSERT INTO accounts (description, amount) VALUES (:description, :amount)");
    query.bindValue(":description", description);
    query.bindValue(":amount", amount);
    if(query.exec()) {
        open_buzzer(); // 调用蜂鸣器
    } else {
        QMessageBox::warning(this, "添加条目", "添加条目失败。");
    }

    model->select();
}

void MainWindow::on_editButton_clicked() {
    QModelIndexList selected = ui->tableView->selectionModel()->selectedRows();
    if (selected.isEmpty()) {
        QMessageBox::warning(this, "编辑条目", "请选择要编辑的条目。");
        return;
    }

    int row = selected.first().row();
    QString description = model->data(model->index(row, 1)).toString();
    double amount = model->data(model->index(row, 2)).toDouble();

    description = ui->comboBox->currentText();
    amount = QInputDialog::getDouble(this, "编辑条目", "金额:", amount);

    QSqlQuery query;
    query.prepare("UPDATE accounts SET description = :description, amount = :amount WHERE id = :id");
    query.bindValue(":description", description);
    query.bindValue(":amount", amount);
    query.bindValue(":id", model->data(model->index(row, 0)).toInt());
    if(query.exec()) {
        open_buzzer(); // 调用蜂鸣器
    } else {
        QMessageBox::warning(this, "编辑条目", "编辑条目失败。");
    }

    model->select();
}

void MainWindow::on_deleteButton_clicked() {
    QModelIndexList selected = ui->tableView->selectionModel()->selectedRows();
    if (selected.isEmpty()) {
        QMessageBox::warning(this, "删除条目", "请选择要删除的条目。");
        return;
    }

    int row = selected.first().row();
    int id = model->data(model->index(row, 0)).toInt();

    QSqlQuery query;
    query.prepare("DELETE FROM accounts WHERE id = :id");
    query.bindValue(":id", id);
    if(query.exec()) {
        open_buzzer(); // 调用蜂鸣器
    } else {
        QMessageBox::warning(this, "删除条目", "删除条目失败。");
    }

    model->select();
}