中国象棋QT登录注册以及悔棋功能

原文链接：https://blog.csdn.net/qq_39355828/article/details/116000375 (opens new window)

# 中国象棋QT登录注册以及悔棋功能

# 1.登录以及注册

使用Qt自带的数据库QSQLITE，进行数据库的创建

QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");

    db.setHostName("hello");
    db.setDatabaseName("data.db");
    db.setUserName("LH");
    db.setPassword("123456");

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数据库建立完成之后，使用创建表

query.exec("create table password(pwd varchar primary key)");
    query.exec("insert into password values('123456')");
    query.exec("create table user(name varchar primary key)");
    query.exec("insert into user values('123456')");

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当UI界面得到登录按键的响应之后，进行判定是否包含在数据库，包含则返回成功，进入象棋界面

void LoginDialog::on_loginBtn_clicked()
{    QString user;
     QString pwd;
     user=ui->name->text();
     pwd=ui->pwdLineEdit->text();
    if(ui->pwdLineEdit->text().isEmpty()){
        QMessageBox::information(this,tr("请输入密码"),tr("请先输入密码再登录！"),QMessageBox::Ok);
        ui->pwdLineEdit->setFocus();
    }else{
        QSqlQuery query;
        QString S = QString("select * from password where pwd='%1'").arg(pwd);
        //query.exec("select * from password where pwd=");
        query.exec(S);
        query.next();
        QSqlQuery query1;
        QString SS = QString("select * from user where name='%1'").arg(user);
        //query1.exec("select name from user");
        query1.exec(SS);
        query1.next();

        if(query.value(0).toString() == ui->pwdLineEdit->text()&&query1.value(0).toString() == ui->name->text())
        {
            QDialog::accept();
            //pwdok=true;
        }

        else{
            QMessageBox::warning(this,tr("账号或密码错误"),tr("请输入正确的密码再登录！"),QMessageBox::Ok);
            ui->pwdLineEdit->clear();
            ui->pwdLineEdit->setFocus();
        }
    }
}

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注册类似登录，需要向数据库写入

void LoginDialog::on_pushButton_clicked()
{   QString user;
    QString pwd;
    user=ui->name->text();
    pwd=ui->pwdLineEdit->text();
    if(ui->pwdLineEdit->text().isEmpty()){
        QMessageBox::information(this,tr("请输入密码"),tr("请先输入密码再注册！"),QMessageBox::Ok);
        ui->pwdLineEdit->setFocus();
    }
    else{
        QSqlDatabase::database().transaction();
        QSqlQuery query;
        //QString S = QString("insert into password valus(' name='%1' and pwd='%2'").arg(user).arg(pwd);
        QString i =QString("insert into password values('%1');").arg(pwd);//插入一条信息到数据库的user_table表中
        qDebug()<<i<<endl;
        bool ok1=query.exec(i);
        //query.next();
       // QSqlQuery query1;
        QString ii =QString("insert into user values('%1');").arg(user);//插入一条信息到数据库的user_table表中
        bool ok2=query.exec(ii);
        qDebug()<<ii<<endl;
        if(ok1&&ok2){
              QSqlDatabase::database().commit();
              QMessageBox::information(this,tr("提示"),tr("注册成功！"),QMessageBox::Ok);

          }
          else{
              QSqlDatabase::database().rollback();
          }

        QMessageBox::warning(this,tr("注册成功"),tr("请登录！"),QMessageBox::Ok);

    }

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# 2.主函数

QApplication app(argc, argv);
    if(!createConnection())return 0;//
    window w;
    LoginDialog dlg;
    if(dlg.exec()==QDialog::Accepted){
        w.show();
        return app.exec();
    }else{
        return 0;
    }

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主函数主要进行了数据库的初始化，并且先进入了登录注册界面，当登录注册完成之后，才会显示主窗口

# 3.象棋对弈

使用alphabeta剪枝算法进行象棋最优走法的搜索。首先做好的就是对局面的评估，对局面评估，主要包括两个部分，棋子本身的价值，以及所在位置的价值，棋子的价值：

int pieceValue[] = {600,300,300,70,1000000,110,110};

所在位置的价值：

const int jPosition [10][9] = {
                {14, 14, 12, 18, 16, 18, 12, 14, 14},
                {16, 20, 18, 24, 26, 24, 18, 20, 16},
                {12, 12, 12, 18, 18, 18, 12, 12, 12},
                {12, 18, 16, 22, 22, 22, 16, 18, 12},
                {12, 14, 12, 18, 18, 18, 12, 14, 12},
                {12, 16, 14, 20, 20, 20, 14, 16, 12},
                {6, 10, 8, 14, 14, 14, 8, 10, 6},
                {4, 8, 6, 14, 12, 14, 6, 8, 4},
                {8, 4, 8, 16, 8, 16, 8, 4, 8},
                {-2, 10, 6, 14, 12, 14, 6, 10, -2},
        };