QTC++ day12

注册登录界面

widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QIcon>
#include <QPushButton>
#include <QLineEdit>
#include <QLabel>
#include <QDebug>
#include <QMessageBox>//消息对话框类
#include "second.h"
#include <QSqlDatabase>//数据库管理类
#include <QSqlQuery>//执行sql语句类
#include <QSqlRecord>//数据库记录的类
#include "zhuce.h" //注册头文件
QT_BEGIN_NAMESPACE
namespace Ui { class widget; }
QT_END_NAMESPACEclass widget : public QWidget
{Q_OBJECT
signals://该权限下定义属于自己的信号void my_signal(QString msg);//自定义一个有参无返回值的信号函数
private:void on_btn1_clicked();//自定义的槽函数声明void on_btn2_clicked();//自定义的槽函数声明void on_btn3_clicked();
public:widget(QWidget *parent = nullptr);~widget();
signals:void jump();//自定义跳转信号函数void jump1();
public://void jump_slot2();private:Ui::widget *ui;//自定义一个btn1QPushButton *btn1;QPushButton *btn2;QPushButton *btn3;QLineEdit *edit2;QLineEdit *edit1;Second *s1;QSqlDatabase db; //定义一个数据库的类对象zhuce *s2;
};
#endif // WIDGET_H

zhuce.h

#ifndef ZHUCE_H
#define ZHUCE_H#include <QWidget>
#include <QLineEdit>
#include <QLabel>
#include <QIcon>
#include <QPushButton>
#include <QMessageBox>
#include <QSqlDatabase>
#include <QSqlQuery>//执行sql语句类
#include <QSqlRecord>//数据库记录的类
//#include "widget.h"
namespace Ui {
class zhuce;
}class zhuce : public QWidget
{Q_OBJECT
private:void on_btn2_clicked();//自定义的槽函数声明void on_btn3_clicked();
public:void jump_slot1();
signals://void jump2();public:explicit zhuce(QWidget *parent = nullptr);~zhuce();private:Ui::zhuce *ui;QLineEdit *edit2;//密码QLineEdit *edit1;//用户名QLineEdit *edit3;//确认密码QPushButton *btn2;QPushButton *btn3;QSqlDatabase db; //定义一个数据库的类对象//widget *s3;
};#endif // ZHUCE_H

widget.cpp

#include "widget.h"widget::widget(QWidget *parent): QWidget(parent)
{//登录成功的界面s1=new Second;connect(this,&widget::jump,s1,&Second::jump_slot);//注册的界面s2=new zhuce;connect(this,&widget::jump1,s2,&zhuce::jump_slot1);//添加数据库if(!db.contains("mysql.db")){//添加数据库db=QSqlDatabase::addDatabase("QSQLITE");//设置数据库名字db.setDatabaseName("mysql.db");}//打开数据库if(!db.open()){QMessageBox::information(this,"失败","数据库打开失败");return;}//准备sql语句对表进行创建QString sql="create table if not exists stu_info(""name varchar(10) primary key,"//用户名"password varchar(20))";//密码//语句执行者QSqlQuery querry;if(!querry.exec(sql)){QMessageBox::information(this,"失败","数据库创建失败");return;}this->setFixedSize(550,400);//设置固定尺寸this->setWindowTitle("Widget");//设置窗口标题this->setWindowIcon(QIcon("D:\\icon\\wodepeizhenshi.png"));//设置窗口图标//实例化一个标签QLabel *lab1 = new QLabel;lab1->setParent(this);lab1->resize(550,215);//重新设置尺寸//lab1->setAlignment(Qt::AlignCenter);//文本对齐lab1->setPixmap(QPixmap("D:\\icon\\logo.png"));lab1->setScaledContents(true);//设置内容自适应QLabel *lab3 = new QLabel;lab3->setParent(this);//指定父组件lab3->resize(40,40);//重新设置尺寸lab3->move(100,220);//lab3->setAlignment(Qt::AlignCenter);lab3->setPixmap(QPixmap("D:\\icon\\userName.jpg"));lab3->setScaledContents(true);//设置内容自适应QLabel *lab2 = new QLabel;lab2->setParent(this);lab2->resize(40,40);//重新设置尺寸lab2->move(100,270);lab2->setPixmap(QPixmap("D:\\icon\\passwd.jpg"));lab2->setScaledContents(true);//设置内容自适应// 实例化一个行编辑器edit1 = new QLineEdit(this);edit1->resize(250,40);edit1->move(lab3->x()+50,lab3->y());// 实例化一个行编辑器edit2 = new QLineEdit(this);edit2->resize(250,40);edit2->move(lab2->x()+50,lab2->y());edit2->setEchoMode(QLineEdit::Password);//设置回显模式//实例化一个按钮并给定图标，文本内容，父组件btn1 = new QPushButton(QIcon("D:\\icon\\login.png"), "登录", this);btn1->resize(100,50);//设置按钮大小btn1->move(225,325);//设置按钮移动位置connect(this->btn1,&QPushButton::clicked,this,&widget::on_btn1_clicked);btn3 = new QPushButton(QIcon("D:\\icon\\R-C.jpg"), "注册", this);btn3->resize(btn1->size());//设置按钮大小btn3->move(btn1->x()-150,btn1->y());//设置按钮移动位置connect(this->btn3,&QPushButton::clicked,this,&widget::on_btn3_clicked);btn2 = new QPushButton(QIcon("D:\\icon\\cancel.png"),"取消", this);btn2->resize(btn1->size());btn2->move(btn1->x()+150,btn1->y());connect(this->btn2,&QPushButton::clicked,this,&widget::on_btn2_clicked);
}
//登录按钮
void widget::on_btn1_clicked()
{//获取界面姓名QString name = this->edit1->text();//准备sql语句QString sql = QString("select * from stu_info where name='%1'").arg(name);//准备执行者QSqlQuery querry;if(!querry.exec(sql)){QMessageBox::information(this, "提示", "登录失败");return;}else{//1、调用构造函数实例化对象QMessageBox box(QMessageBox::Information,//图标"信息对话框",//对话框标题"登录成功",//对话框文本内容QMessageBox::Ok,//提供的按钮this);//父组件box.setDefaultButton(QMessageBox::Ok);//将OK设置为默认按钮//2、调用exec函数运行对话框int ret=box.exec();//3、对结果进行判断if(ret==QMessageBox::Ok){emit jump();this->hide();}}
}
//取消按钮
void widget::on_btn2_clicked()
{//1、调用构造函数实例化对象QMessageBox box(QMessageBox::Question,//图标"问题对话框",//对话框标题"是否确定取消登录？",//对话框文本内容QMessageBox::Yes|QMessageBox::No,//提供的按钮this);//父组件box.setDefaultButton(QMessageBox::No);//将no设置为默认按钮//2、调用exec函数运行对话框int ret=box.exec();//3、对结果进行判断if(ret==QMessageBox::Yes){close();}else if(ret==QMessageBox::No){}
}
void widget::on_btn3_clicked()
{emit jump1();//QWidget::hide();
}
widget::~widget()
{
}/*void widget::jump_slot2()
{this->show();
}*/

zhuce.cpp

#include "zhuce.h"
#include "ui_zhuce.h"zhuce::zhuce(QWidget *parent) :QWidget(parent),ui(new Ui::zhuce)
{//注册的界面//s3=new widget;//connect(this,&zhuce::jump2,s3,&widget::jump_slot2);this->setFixedSize(550,500);//设置固定尺寸this->setWindowTitle("注册");//设置窗口标题this->setWindowIcon(QIcon("D:\\icon\\wodepeizhenshi.png"));//设置窗口图标//实例化一个标签QLabel *lab = new QLabel;lab->setParent(this);lab->resize(550,215);//重新设置尺寸//lab1->setAlignment(Qt::AlignCenter);//文本对齐lab->setPixmap(QPixmap("D:\\icon\\logo.png"));lab->setScaledContents(true);//设置内容自适应ui->setupUi(this);QLabel *lab1 = new QLabel;lab1->setParent(this);//指定父组件lab1->resize(150,40);//重新设置尺寸lab1->move(100,220);//lab3->setAlignment(Qt::AlignCenter);lab1->setText("用户名:");lab1->setScaledContents(true);//设置内容自适应QLabel *lab2 = new QLabel;lab2->setParent(this);lab2->resize(150,40);//重新设置尺寸lab2->move(100,270);lab2->setText("密码:");lab2->setScaledContents(true);//设置内容自适应QLabel *lab3 = new QLabel;lab3->setParent(this);lab3->resize(150,40);//重新设置尺寸lab3->move(100,320);lab3->setText("确认密码:");lab3->setScaledContents(true);//设置内容自适应// 实例化一个行编辑器edit1 = new QLineEdit(this);edit1->resize(250,40);edit1->move(lab1->x()+80,lab1->y());// 实例化一个行编辑器edit2 = new QLineEdit(this);edit2->resize(250,40);edit2->move(lab2->x()+80,lab2->y());edit2->setEchoMode(QLineEdit::Password);//设置回显模式edit3 = new QLineEdit(this);edit3->resize(250,40);edit3->move(lab3->x()+80,lab3->y());edit3->setEchoMode(QLineEdit::Password);//设置回显模式btn3 = new QPushButton(QIcon("D:\\icon\\R-C.jpg"), "注册", this);btn3->resize(100,50);//设置按钮大小btn3->move(125,400);//设置按钮移动位置connect(this->btn3,&QPushButton::clicked,this,&zhuce::on_btn3_clicked);btn2 = new QPushButton(QIcon("D:\\icon\\cancel.png"),"取消", this);btn2->resize(100,50);btn2->move(325,400);connect(this->btn2,&QPushButton::clicked,this,&zhuce::on_btn2_clicked);//添加数据库if(!db.contains("mysql.db")){//添加数据库db=QSqlDatabase::addDatabase("QSQLITE");//设置数据库名字db.setDatabaseName("mysql.db");}//打开数据库if(!db.open()){QMessageBox::information(this,"失败","数据库打开失败");return;}
}zhuce::~zhuce()
{delete ui;
}
//取消
void zhuce::on_btn2_clicked()
{//1、调用构造函数实例化对象QMessageBox box(QMessageBox::Question,//图标"问题对话框",//对话框标题"是否确定取消注册？",//对话框文本内容QMessageBox::Yes|QMessageBox::No,//提供的按钮this);//父组件box.setDefaultButton(QMessageBox::No);//将no设置为默认按钮//2、调用exec函数运行对话框int ret=box.exec();//3、对结果进行判断if(ret==QMessageBox::Yes){close();}else if(ret==QMessageBox::No){}
}
void zhuce::on_btn3_clicked()
{//记录要录入的数据QString name=this->edit1->text();QString password=this->edit3->text();if(this->edit2->text()!=this->edit3->text()&&this->edit2->text()!=0&&this->edit3->text()!=0){QMessageBox::information(this,"失败","请输入相同的密码");return;}//准备sql语句QString sql=QString("insert into stu_info(name,password)""values('%1','%2')").arg(name).arg(password);//准备执行语句者QSqlQuery querry;if(!querry.exec(sql)){QMessageBox::information(this,"失败","注册失败");return;}else{QMessageBox::information(this,"成功","注册成功");//emit jump2();this->edit1->clear();this->edit2->clear();this->edit3->clear();this->close();//parentWidget()->show();}
}
void zhuce::jump_slot1()
{this->show();
}

思维导图：