How to copy and paste QT? （QClipboard）

Here we use QMenu Menu bar to show examples ：

 QMenu *m_ProgramBtnGroupMenu;
 QAction *m_CopyEffectAction;

Add operation ：

    m_ProgramBtnGroupMenu = new QMenu(this);
    m_ProgramBtnGroupMenu->addAction(tr(" Copy "), this, SLOT(slotProgramGroupCopy()));
    m_CopyEffectAction = m_ProgramBtnGroupMenu->addAction(tr(" Paste "), this, SLOT(slotProgramGroupPost()));
    m_CopyEffectAction->setEnabled(false);// Add this sentence , Before copying , The paste is gray 
    // Restore the operation of the paste button here 
    connect(QApplication::clipboard(),SIGNAL(dataChanged()), this, SLOT(slotClipDataChange()));

void LightEditWidget::slotClipDataChange()
{
    QClipboard* clipboard = QApplication::clipboard();
    if(clipboard->text().isEmpty()){
        m_CopyEffectAction->setEnabled(false);
    }else{
        m_CopyEffectAction->setEnabled(true);
    }
}

Copy ：

    QClipboard* clipboard = QApplication::clipboard();
    int iSelectProgramIndex = m_iProgramBtnIndex;
    int iStep = m_iCurStep;
    QString sText = QString("%1%2").arg(iSelectProgramIndex).arg(iStep);
    clipboard->setText(sText);// The content written here is the content pasted later , According to their own needs 

Get the contents of the pasteboard ：

 QClipboard* clipboard = QApplication::clipboard();
 QString sText = clipboard->text(QClipboard::Clipboard);