DAY54

chat.h

#ifndef CHAT_H
#define CHAT_H

#include 
#include 
#include 
#include 
#include 

namespace Ui {
class chat;
}

class chat : public QWidget
{
    Q_OBJECT

public:
    explicit chat(QWidget *parent = nullptr);
    ~chat();
    void jump_slot();


private slots:
    void on_pushbutton1_clicked();


    void on_pushbutton2_clicked();

private:
    Ui::chat *ui;

    QSqlDatabase db;
};

#endif // CHAT_H

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "chat.h"
#include 
#include 
#include 
#include 

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT


public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void on_btn2_clicked();

    void on_btn3_clicked();

    void on_btn4_clicked();

signals:
    void jump();

private:
    Ui::Widget *ui;

    chat *s1;
};
#endif // WIDGET_H

chat.cpp

#include "chat.h"
#include "ui_chat.h"

chat::chat(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::chat)
{
    ui->setupUi(this);

    if(!db.contains("mydatabase.db"))
    {
        db = QSqlDatabase::addDatabase("QSQLITE");

        db.setDatabaseName("mydatabase.db");
    }

    if(!db.open())
    {
        QMessageBox::information(this," 失败","数据库打开失败");
        return ;
    }

    QString sql = "create table if not exists usr("
                  "account varchar(10),"
                  "password varchar(15))";

    QSqlQuery querry;
    if(!querry.exec(sql))
    {
        QMessageBox::information(this,"失败","创建表失败");
        return ;
    }
}

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

void chat::jump_slot()
{
    this->show();
}

void chat::on_pushbutton1_clicked()
{
    QString account = ui->pushbutton1->text();
    QString password = ui->pushbutton2->text();

    if(account.isEmpty() || password.isEmpty())
    {
        QMessageBox::information(this,"提示","请讲信息填写完整");
        return ;
    }

    QString sql = QString("insert into usr(account,password)"
                          "values('%1','%2')").arg(account).arg(password);

    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");
    }
}

void chat::on_pushbutton2_clicked()
{
    this->close();
}

main.cpp

#include "widget.h"

#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

widget.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    s1 = new chat;
    connect(this,&Widget::jump,s1,&chat::jump_slot);



    this->setWindowTitle("221#223社畜登录框");      //设置窗口标题
    this->setWindowIcon(QIcon(":/new/prefix1/C:/Users/Administrator/Desktop/t/QQ.png"));    //设置窗口图标
    this->setStyleSheet("background-color:skyblue;");    //设置窗口样式表
    this->setWindowOpacity(1);       //设置窗口透明度



    ui->lab1->setPixmap(QPixmap(":/new/prefix1/C:/Users/Administrator/Desktop/t/(}OLKA@[email protected]"));
    ui->lab1->setScaledContents(true);    //填充标签


    ui->btn1->setIcon(QIcon(":/new/prefix1/C:/Users/Administrator/Desktop/t/QQ.png"));   //设置图标


    ui->btn2->setIcon(QIcon(":/new/prefix1/C:/Users/Administrator/Desktop/t/QQ.png"));   //设置图标


    ui->btn3->setIcon(QIcon(":/new/prefix1/C:/Users/Administrator/Desktop/t/QQ.png"));   //设置图标

    ui->btn4->setStyleSheet("background-color:skyblue; border-radius:10px; ");



}

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



//登录按钮
void Widget::on_btn2_clicked()
{

    QString sql = "select * from usr";
    QSqlQuery querry;

    if(!querry.exec(sql))
    {
        QMessageBox::information(this,"提示","匹配失败");
        return ;
    }
    int i = 0;
    while(querry.next())
    {

        for(int j = 0; j < querry.record().count(); j++)
        {
            //登录失败
            if(ui->edit1->text() != querry.record().value(j) && ui->edit2->text() != querry.record().value(j))
            {
                //调用构造函数实例化对象
                QMessageBox box(QMessageBox::Critical,//图标
                                "错误",//对话框标题
                                "账号密码不匹配，是否重新登录",//对话框文本
                                QMessageBox::Yes|QMessageBox::No,//提供的按钮
                                this);//父组件
                box.setDefaultButton(QMessageBox::Yes);
                box.setButtonText(QMessageBox::Yes,"OK");
                box.setButtonText(QMessageBox::No,"cancel");
                //调用exec函数运行对话框
                int ret = box.exec();
                //对结果进行判断
                if(ret==QMessageBox::Yes)
                {
                    //清空内容
                    ui->edit1->clear();
                    ui->edit2->clear();
                }
                else
                {
                    //关闭界面
                    this->close();
                }
            }
            //登录成功
            else
            {
                //调用构造函数实例化对象
                QMessageBox box(QMessageBox::NoIcon,//图标
                                " ",//对话框标题
                                "登录成功",//对话框文本
                                QMessageBox::Ok,//提供的按钮
                                this);//父组件
                box.exec();//运行对话框
                emit jump();//跳转界面
                this->close();//关闭当前界面
            }

        }
        i++;
    }


}

void Widget::on_btn3_clicked()
{
    int ret=QMessageBox::warning(this,
                         "警告",
                         "是否确定要退出登录",
                         QMessageBox::Yes | QMessageBox::No,
                         QMessageBox::No);

    //对结果进行判断如果点yes则关闭
    if(ret==QMessageBox::Yes)
    {
        this->close();//关闭界面
    }
}

void Widget::on_btn4_clicked()
{
    emit jump();
}