#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QTextToSpeech>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
private slots:
    void on_pushButton_Speed_clicked();
private:
    Ui::MainWindow *ui;
private:
    QTextToSpeech m_Speech;
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
#pragma execution_character_set("utf-8")
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    QIcon disconnect = QIcon(":/save.png");
    ui->pushButton_Speed->setText(QStringLiteral("Speech"));
    ui->pushButton_Speed->setIconSize(QSize(32, 32));
    ui->pushButton_Speed->setLayoutDirection(Qt::RightToLeft);
    ui->pushButton_Speed->setIcon(disconnect);
 
 
 
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_pushButton_Speed_clicked()
{
    m_Speech.say(ui->textEdit->toPlainText());
}

QTextToSpeech *tts =
new QTextToSpeech(this);
if(tts->state()==QTextToSpeech::Ready)
{
tts->say(
"hello world");
}