如何将函数的fileId用于其他函数？

Question

我具有这两个功能，但是在DriveFile的id字段中，arquivoiD无法正常工作，它总是向我返回错误驱动器材料必须具有ID。”

QMessageBox msgBox;
msgBox.setWindowTitle("This is a prompt");
msgBox.setIcon(QMessageBox::Question);
msgBox.layout()->setSizeConstraint(QLayout::SetMaximumSize);
msgBox.setText(tr("This is some text"));
msgBox.setInformativeText(tr("Here is some great information for you.\n"));
msgBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
msgBox.setDefaultButton(QMessageBox::No);
msgBox.setBaseSize(QSize(400, 160));
QList<QAbstractButton *> bList = msgBox.buttons();
for (int i=0; i<bList.count(); i++)
{
    bList.at(i)->setFocusPolicy(Qt::StrongFocus);
}
int ret = msgBox.exec();