Question

我创建了一个登录页面，当一个人输入他的用户名和密码时，访问权限现在我想将该用户名传递给下一个开放表单，以便制作个人仪表板。

代码在这里

admin_panel.cpp

#include "admin_panel.h"
#include "ui_admin_panel.h"
#include<QMessageBox>
#include "login.h"

admin_panel::admin_panel(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::admin_panel)
{

    ui->setupUi(this);


}

admin_panel::~admin_panel()
{

    delete ui;
}

void admin_panel::on_pushButton_clicked()
{
    Login conn;
    QMessageBox msg;
    QString Name,Surname,Role,Username, Password;
    Name = ui->txt_name->text();
    Surname = ui->txt_surname->text();
    Role = ui->txt_role->text();
    Username = ui->txt_username->text();

    Password = ui->txt_password->text();


    if(!conn.connOpen())
    {
        qDebug() << "No connection to db";
        return;
    }
     conn.connOpen();


    QSqlQuery qry;
    qry.prepare("INSERT INTO Users (Name,Surname,Role,Username,Password) VALUES(:Name,:Surname, :Role, :Username, :Password)");
    qry.bindValue(":Name", Name);
    qry.bindValue(":Surname", Surname);
    qry.bindValue(":Role", Role);
    qry.bindValue(":Username", Username);
    qry.bindValue(":Password", Password);

    if(qry.exec())
    {
        if(!qry.next())
        {
            msg.setText("Saved");
            msg.exec();
            conn.connClose();

        }
        else
        {
            QMessageBox::critical(this,tr("error::"),qry.lastError().text());
        }
    }

}

admin_panel.h文件

#ifndef ADMIN_PANEL_H
#define ADMIN_PANEL_H

#include <QDialog>

namespace Ui {
class admin_panel;
}

class admin_panel : public QDialog
{
    Q_OBJECT


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

private slots:
    void on_pushButton_clicked();

    void on_user_linkActivated(const QString &link);


private:
    Ui::admin_panel *ui;

};

#endif // ADMIN_PANEL_H

login.h文件

#ifndef LOGIN_H
#define LOGIN_H

#include <QMainWindow>
#include<QtSql/QtSql>
#include<QDebug>
#include <QDialog>
#define path "DB.sqlite"

namespace Ui {
class Login;
}

class Login : public QMainWindow
{
    Q_OBJECT

public:
    QSqlDatabase myDB;
    void connClose()
    {
        myDB.close();
        myDB.removeDatabase(QSqlDatabase::defaultConnection);
    }

    bool connOpen()
    {

        myDB = QSqlDatabase::addDatabase("QSQLITE");
        myDB.setDatabaseName(path);


            if(myDB.open())
            {
                qDebug()<<("[+]Connected to Database");
                return true;

            }
            else
            {
                qDebug()<<("[!] Database not found");
                return false;
            }
    }

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


private slots:
    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

private:
    Ui::Login *ui;
};

#endif // LOGIN_H

login.cpp文件

#include "login.h"
#include "ui_login.h"
#include "admin_panel.h"
#include<QMessageBox>
#define path "DB.sqlite"
Login::Login(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Login)
{
    ui->setupUi(this);
    QFileInfo checkfile(path);

   if(checkfile.isFile())
   {
       if(connOpen())
       {
           ui->label->setText("[+]Connected to Database");

       }
       else
       {
           ui->label->setText("[!] Database not found");
       }
  }
   ui->time->setText( QTime::currentTime().toString());
}


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

void Login::on_pushButton_clicked()
{
    QString Username,Password;
    Username = ui->txt_user->text();
    Password = ui->txt_pass->text();

    if(!myDB.isOpen())
    {
        qDebug() << "No connection to db";
        return;
    }

   //connOpen();
    QSqlQuery qry;

    qry.prepare("SELECT Username, Password, Role FROM Users WHERE Username=\'" + Username + "\' AND Password=\'" + Password + "\'");
    if(qry.exec())
    {
        if(qry.next())
        {
            ui->label->setText("[+] Valid username and password");
            QString msg = "Username = " + qry.value(0).toString() + " \n" +
                    "Role = " + qry.value(2).toString();

            QMessageBox::warning(this,"Login was successful",msg);

             connClose();
             this->hide();
             admin_panel admin;
             admin.setModal(true);
             admin.exec();          


        }
        else
        {
            ui->label->setText("[-]Wrong username or password");
        }
    }
}

void Login::on_pushButton_2_clicked()
{
    ui->txt_user->setText("");
    ui->txt_pass->setText("");
}

这是main.cpp

#include "login.h"
#include "admin_panel.h"
#include<QDialog>
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Login login;
    int q = 1;
    admin_panel admin(0);
    login.show();
    login.show();->admin();



    return a.exec();
}

从login.cpp文件成功登录后，

。如何将用户名传递到admin_panel.cpp中，以后我可以在标签中使用

Answer 1

您可以使用QT的信号槽机制。在登录类中创建SIGNAL，在 admin_panel 中创建SLOT，并在main.cpp中放置 QObject :: connect（...），然后发出slot使用登录中的userName。

如何将变量从一个表单传递给另一个表单？

1 个答案: