using QAxWidget Adobe PDF Reader with qDebug()<<pdf->dynamicCall("Print()"); I received: QVariant(Invalid)

philxxx609

Hello guys,

Why I can not print with pdf->dynamicCall("Print()");?

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "qdebug.h"
//#include "QPushButton"

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

    pdf = new QAxWidget(this);

    if(!pdf->setControl("Adobe PDF Reader"))//("Microsoft Web Browser")
        QMessageBox::critical(this, "Error", "Make sure you have Adobe Reader (and its ActiveX) installed!");
qDebug() << pdf->control();
   // setCentralWidget(pdf);
    pdf->setGeometry(10,10,500,500);
    currentPage=1;
}

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


void MainWindow::on_pushButton_clicked()
{
    pdf->dynamicCall("LoadFile(QString)",
        QDir::toNativeSeparators(QFileDialog::getOpenFileName(this, "Open PDF File", QDir::currentPath(), "PDF Documents (*.pdf)")));
pdf->dynamicCall("SetCurrentPage(int)",currentPage);

}

void MainWindow::on_pushButton_2_clicked()
{
    currentPage=currentPage+1;
    pdf->dynamicCall("SetCurrentPage(int)",currentPage);

    qDebug()<<pdf->dynamicCall("Print()");
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <ActiveQt>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

    QAxWidget *pdf;
int currentPage;
private slots:
    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

thanks for your help!!