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#include "mainwindow.h"
#include <QApplication>
#include <QtWebEngineCore>
#include <QtWebEngineWidgets>
#include <QUrl>
#include <QString>

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

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "string.h"
#include "vkapiwin.h"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
private slots:
    void on_pushButton_2_clicked();

    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;
    vkapiwin *vkapi;
};

#endif // MAINWINDOW_H

#ifndef VKAPIWIN_H
#define VKAPIWIN_H

#include <QWidget>

namespace Ui {
class vkapiwin;
}

class vkapiwin : public QWidget
{
    Q_OBJECT

public:
    explicit vkapiwin(QWidget *parent = 0);
    ~vkapiwin();
    Ui::vkapiwin *ui;
public slots:
    virtual void check_url(QUrl &url,QString &token,QString &id);
};

#endif // VKAPIWIN_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "vkapiwin.h"
#include <QUrlQuery>

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

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

void MainWindow::on_pushButton_2_clicked()
{
 vkapiwin *vkapi= new vkapiwin();
 vkapi->show();
 if (vkapi == NULL)
 {
     vkapi->hide();
     this->show();
 }
}

void MainWindow::on_pushButton_clicked()
{
   ............
}

#include "vkapiwin.h"
#include "ui_vkapiwin.h"
#include <QUrlQuery>
#include <QSsl>
#include <QWidget>

vkapiwin::vkapiwin(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::vkapiwin)
{
    ui->setupUi(this);
    ui->preview->load(QUrl("https://oauth.vk.com/authorize?client_id=5681259&display=mobile&redirect_uri=https://oauth.vk.com/blank.html&scope=friends&response_type=token&v=5.60&state=123456"));
    connect(ui->preview,SIGNAL(urlChanged(QUrl)),this,SLOT(check_url(QUrl,token,id)));
    ui->preview->show();
}

vkapiwin::~vkapiwin()
{
    delete ui;
}
void vkapiwin::check_url(QUrl &url,QString &token,QString &id)
{
    url = url.toString().replace("#","?");
    token = QUrlQuery(url).queryItemValue("access_token");
    id = QUrlQuery(url).queryItemValue("user_id");
}

void vkapiwin::check_url(QUrl &url)
{
    QString url1 = url.toString().replace("#","?");
    this->token = QUrlQuery(url1).queryItemValue("access_token");
    this->id = QUrlQuery(url1).queryItemValue("user_id");
}