• 2023年9月21日

    完善登录界面的注册登录功能

    头文件1

    1. #ifndef MAINWINDOW_H
    2. #define MAINWINDOW_H
    3.  
    4. #include 
    5. #include 
    6. #include 
    7. #include 
    8. #include 
    9. #include 
    10. #include 
    11. #include 
    12. #include 
    13. #include 
    14.  
    15. QT_BEGIN_NAMESPACE
    16. namespace Ui {class MainWindow;}
    17. QT_END_NAMESPACE
    18.  
    19. class MainWindow : public QMainWindow
    20. {
    21.     Q_OBJECT
    22.  
    23. public:
    24.     MainWindow(QWidget *parent = nullptr);
    25.     ~MainWindow();
    26. public slots:
    27.     //void on_btn1_clicked();
    28.  
    29.     void my_slot1();
    30.     void my_slot2();
    31.     void my_slot3();
    32.  
    33. private:
    34.     Ui::MainWindow *ui;
    35.     QLineEdit *edti1;
    36.     QLineEdit *edti2;
    37.     QPushButton *btn1;
    38.     QPushButton *btn2;
    39.     QPushButton *btn3;
    40.     QLabel *lab1;
    41.     QLabel *lab2;
    42.     QLabel *lab3;
    43.     QSqlDatabase db;  //定义一个数据库的类对象
    44.  
    45. signals:
    46.     //void btn1_signal();
    47.     void jump();
    48.     void jump2();
    49. };
    50. #endif // MAINWINDOW_H

    .cpp1

    1. #include "mainwindow.h"
    2. #include 
    3. #include 
    4. #include 
    5. #include 
    6.  
    7.  
    8. MainWindow::MainWindow(QWidget *parent)
    9.     : QMainWindow(parent)
    10. {
    11.     //界面
    12.     this->setFixedSize(800,600);  //设置固定尺寸
    13.     this->setWindowTitle("摇篮游行");  //设置窗口标签
    14.     this->setWindowIcon(QIcon(":/pict/123.webp")); //设置窗口图标
    15.  
    16.     //登录按钮
    17.     btn1 = new QPushButton(QIcon(":/pict/213.jpg"),"登录",this);  //构造一个按钮
    18.     btn1->resize(100,50);  //设置按钮大小
    19.     btn1->move(550,420);   //移动按钮
    20.  
    21.     //退出按钮
    22.     btn2 = new QPushButton(QIcon(":/pict/12345.jpg"),"退出",this); //构造一个按钮
    23.     btn2->resize(btn1->size());
    24.     btn2->move(550,520);
    25.  
    26.     //注册按钮
    27.     btn3 = new QPushButton(QIcon(":/pict/1234567.jpg"),"注册",this);
    28.     btn3->resize(btn1->size());
    29.     btn3->move(680,420);
    30.  
    31.     //行编辑器
    32.     edti1 = new QLineEdit(this);  //构造一个行编辑器
    33.     edti1->setPlaceholderText("繁星凝望着海洋");
    34.     edti1->resize(300,50);
    35.     edti1->move(180,420);
    36.  
    37.     edti2 = new QLineEdit(this);  //构造一个行编辑器
    38.     edti2->setPlaceholderText("海洋拥抱着风帆");
    39.     edti2->resize(300,50);
    40.     edti2->move(180,520);
    41.  
    42.     //按钮事件
    43.     connect(btn1,SIGNAL(clicked()),this,SLOT(my_slot1()));
    44.     connect(btn2,SIGNAL(clicked()),this,SLOT(my_slot2()));
    45.     connect(btn3,SIGNAL(clicked()),this,SLOT(my_slot3()));
    46.  
    47.     //标签
    48.     lab1 = new QLabel(this);
    49.     lab1->resize(80,50);
    50.     lab1->setPixmap(QPixmap(":/pict/321.webp"));
    51.     lab1->setScaledContents(true);
    52.     lab1->move(100,420);
    53.  
    54.     lab2 = new QLabel(this);
    55.     lab2->resize(80,50);
    56.     lab2->setPixmap(QPixmap(":/pict/4321.webp"));
    57.     lab2->setScaledContents(true);
    58.     lab2->move(100,520);
    59.  
    60.     //gif
    61.     QMovie *movie = new QMovie(":/pict/6.gif");
    62.     lab3 = new QLabel(this);
    63.     lab3->resize(800,400);
    64.     lab3->setMovie(movie);
    65.     movie->start();
    66.     lab3->setScaledContents(true);
    67.     lab3->move(0,0);
    68.  
    69.     //如果没有则创建数据库
    70.     if(!db.contains("lamia.db"))
    71.     {
    72.         //添加一个数据库
    73.         db = QSqlDatabase::addDatabase("QSQLITE");
    74.  
    75.         //设置名字
    76.         db.setDatabaseName("lamia.db");
    77.     }
    78.  
    79.     //打开数据库
    80.     if(!db.open())
    81.     {
    82.         QMessageBox::information(this,"失败","数据库打开失败");
    83.         return ;
    84.     }
    85. }
    86.  
    87. //登录按钮
    88. void MainWindow::my_slot1()
    89. {
    90.     //sql语句
    91.     QString sql = "select * from user";
    92.  
    93.     QSqlQuery querry;
    94.  
    95.     if(!querry.exec(sql))
    96.     {
    97.         QMessageBox::information(this,"提示","信息查询失败");
    98.         return;
    99.     }
    100.     int flag=0;
    101.     while(querry.next())
    102.     {
    103.         QString user = querry.record().value(0).toString();
    104.         QString word = querry.record().value(1).toString();
    105.         if(this->edti1->text()==user&&this->edti2->text()==word)
    106.         {
    107.             QMessageBox::information(this,"登录成功","登录成功！");
    108.             emit jump();
    109.             flag=1;
    110.             this->close();
    111.         }
    112.     }
    113.     if(flag==0)
    114.     {
    115.     QMessageBox::critical(
    116.                 this,tr("摇篮游行"),
    117.                 tr("账号或密码不正确，是否重新登录"),
    118.                 QMessageBox::Yes | QMessageBox::Cancel,
    119.                 QMessageBox::Cancel
    120.                 );
    121.     }
    122.  
    123. }
    124.  
    125. //退出按钮
    126. void MainWindow::my_slot2()
    127. {
    128.     int ret = QMessageBox::question(
    129.                 this,tr("摇篮游行"),
    130.                 tr("是否退出"),
    131.                 QMessageBox::Yes | QMessageBox::No,
    132.                 QMessageBox::No);
    133.     if(ret==QMessageBox::Yes)
    134.     {
    135.         this->close();
    136.     }
    137.  
    138.  
    139. }
    140.  
    141. //注册按钮
    142. void MainWindow::my_slot3()
    143. {
    144.     emit jump2();
    145. }
    146.  
    147. MainWindow::~MainWindow()
    148. {
    149.  
    150. }
    151.

    头文件2

    1. #ifndef SECOND_H
    2. #define SECOND_H
    3.  
    4. #include 
    5. #include 
    6. #include 
    7. #include 
    8. #include 
    9. #include 
    10. #include 
    11. #include 
    12. #include 
    13. #include 
    14. #include 
    15.  
    16. namespace Ui {
    17. class second;
    18. }
    19.  
    20. class second : public QWidget
    21. {
    22.     Q_OBJECT
    23.  
    24. public slots:
    25.     void jump_slot();
    26.  
    27. public:
    28.     explicit second(QWidget *parent = nullptr);
    29.     ~second();
    30.  
    31. private:
    32.     Ui::second *ui;
    33.     QLabel *lab1;
    34. };
    35.  
    36. #endif // SECOND_H

    .cpp2

    1. #include "second.h"
    2. #include "ui_second.h"
    3.  
    4. second::second(QWidget *parent) :
    5.     QWidget(parent),
    6.     ui(new Ui::second)
    7. {
    8.     ui->setupUi(this);
    9.     this->setFixedSize(800,600);  //设置固定尺寸
    10.     this->setWindowTitle("摇篮游行");  //设置窗口标签
    11.     this->setWindowIcon(QIcon(":/pict/123.webp")); //设置窗口图标
    12.  
    13.     lab1 = new QLabel(this);
    14.     lab1->resize(800,600);
    15.     lab1->setText("施工中");
    16.     lab1->setAlignment(Qt::AlignCenter);
    17.     lab1->move(0,0);
    18. }
    19.  
    20. second::~second()
    21. {
    22.     delete ui;
    23. }
    24.  
    25. void second::jump_slot()
    26. {
    27.     this->show();
    28. }

    头文件3

    1. #ifndef THIRD_H
    2. #define THIRD_H
    3.  
    4. #include 
    5. #include 
    6. #include 
    7. #include 
    8. #include 
    9. #include 
    10. #include 
    11. #include 
    12. #include 
    13. #include 
    14.  
    15. namespace Ui {
    16. class third;
    17. }
    18.  
    19. class third : public QWidget
    20. {
    21.     Q_OBJECT
    22.  
    23. public:
    24.     explicit third(QWidget *parent = nullptr);
    25.     QLineEdit *edti1;
    26.     QLineEdit *edti2;
    27.     ~third();
    28.  
    29. public slots:
    30.     void jump_slot();
    31.     void my_slot1();
    32.     void my_slot2();
    33.  
    34. private:
    35.     //定义ui界面
    36.     Ui::third *ui;
    37.     QPushButton *btn2;
    38.     QPushButton *btn3;
    39.     QLabel *lab1;
    40.     QSqlDatabase db;  //定义一个数据库的类对象
    41. };
    42.  
    43. #endif // THIRD_H

    .cpp3

    1. #include "third.h"
    2. #include "ui_third.h"
    3.  
    4. third::third(QWidget *parent) :
    5.     QWidget(parent),
    6.     ui(new Ui::third)
    7. {
    8.     ui->setupUi(this);
    9.     //界面
    10.     this->setFixedSize(450,400);  //设置固定尺寸
    11.     this->setWindowTitle("账号注册");  //设置窗口标签
    12.     this->setWindowIcon(QIcon(":/pict/1234567.jpg")); //设置窗口图标
    13.  
    14.     //注册按钮
    15.     btn3 = new QPushButton(QIcon(":/pict/4321.png"),"注册",this);
    16.     btn3->resize(100,50);
    17.     btn3->move(300,270);
    18.  
    19.     //退出按钮
    20.     btn2 = new QPushButton(QIcon(":/pict/123123.png"),"退出",this);
    21.     btn2->resize(100,50);
    22.     btn2->move(300,340);
    23.  
    24.     //标签
    25.     lab1 = new QLabel(this);
    26.     lab1->resize(500,250);
    27.     lab1->setPixmap(QPixmap(":/pict/54321.jpg"));
    28.     lab1->setScaledContents(false);
    29.     lab1->move(0,0);
    30.  
    31.     //账号密码栏
    32.     edti1 = new QLineEdit(this);  //构造一个行编辑器
    33.     edti1->setPlaceholderText("注册账号");
    34.     edti1->resize(200,50);
    35.     edti1->move(20,270);
    36.  
    37.     edti2 = new QLineEdit(this);  //构造一个行编辑器
    38.     edti2->setPlaceholderText("注册密码");
    39.     edti2->resize(200,50);
    40.     edti2->move(20,340);
    41.  
    42.     connect(btn3,SIGNAL(clicked()),this,SLOT(my_slot1()));
    43.     connect(btn2,SIGNAL(clicked()),this,SLOT(my_slot2()));
    44.  
    45.     //如果没有则创建数据库
    46.     if(!db.contains("lamia.db"))
    47.     {
    48.         //添加一个数据库
    49.         db = QSqlDatabase::addDatabase("QSQLITE");
    50.  
    51.         //设置名字
    52.         db.setDatabaseName("lamia.db");
    53.     }
    54.  
    55.     //打开数据库
    56.     if(!db.open())
    57.     {
    58.         QMessageBox::information(this,"失败","数据库打开失败");
    59.         return ;
    60.     }
    61.  
    62.     //创建表
    63.     QString sql = "create table if not exists user("
    64.                   "username varchar(20),"
    65.                   "password varchar(20))";
    66.  
    67.     QSqlQuery querry;
    68.     if(!querry.exec(sql))
    69.     {
    70.         QMessageBox::information(this,"失败","创建表失败");
    71.         return ;
    72.     }
    73.  
    74. }
    75.  
    76. third::~third()
    77. {
    78.     delete ui;
    79. }
    80.  
    81. void third::jump_slot()
    82. {
    83.     this->show();
    84. }
    85.  
    86. void third::my_slot2()
    87. {
    88.     int ret = QMessageBox::question(
    89.                 this,tr("退出提示"),
    90.                 tr("是否退出"),
    91.                 QMessageBox::Yes | QMessageBox::No,
    92.                 QMessageBox::No);
    93.     if(ret==QMessageBox::Yes)
    94.     {
    95.         this->close();
    96.     }
    97. }
    98.  
    99. void third::my_slot1()
    100. {
    101.     //获取输入栏中的内容
    102.     QString user = this->edti1->text();
    103.     QString password = this->edti2->text();
    104.  
    105.     //确保账号密码都被输入
    106.     if(user.isEmpty()||password.isEmpty())
    107.     {
    108.         QMessageBox::information(this,"提示","请将信息填写完整");
    109.         return ;
    110.     }
    111.  
    112.     //遍历查看账号是否以注册
    113.     //sql语句
    114.     QString sql = "select * from user";
    115.  
    116.     QSqlQuery querry;
    117.  
    118.     if(!querry.exec(sql))
    119.     {
    120.         QMessageBox::information(this,"提示","账号查询失败");
    121.         return;
    122.     }
    123.  
    124.     int flag=0;
    125.     QString olduser="";
    126.     while(querry.next())
    127.     {
    128.          olduser = querry.record().value(0).toString();
    129.         if(olduser==user)
    130.         {
    131.             QMessageBox::warning(this,"错误","改账号已注册请重新输入");
    132.             this->edti1->clear();
    133.             this->edti2->clear();
    134.             flag=1;
    135.         }
    136.     }
    137.  
    138.     //sql语句录入信息
    139.     if(flag==0)
    140.     {
    141.         sql = QString("insert into user(username,password)"
    142.                                "values('%1','%2')").arg(user).arg(password);
    143.  
    144.         QSqlQuery querry;
    145.         if(!querry.exec(sql))
    146.         {
    147.             QMessageBox::information(this,"失败","注册失败");
    148.             return;
    149.         }else
    150.         {
    151.             QMessageBox::information(this,"成功","注册成功");
    152.             this->edti1->clear();
    153.             this->edti2->clear();
    154.         }
    155.         this->close();
    156.     }
    157. }
    158.

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  • 原文地址：https://blog.csdn.net/2201_75732711/article/details/133147910