how to find child widget from parent.

hi to all, I've centos7.5 and Qt 5.7 in VM. I am trying to get child (lineEdit) from parent. I tried like this :-

Code:

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void dialogAddNewRecord::insert_intoDB(QString *name, qint32 *stock, qint32 *rate, qint32 *number)
{
    logindlg = new dialogLogin(this);
 
 
    QLineEdit *uname_l = logindlg->findChild<QLineEdit*>("lineEditUserNameLoginForm");
    QString uname = uname_l->text().trimmed();
    qDebug() << "uname = " << uname;
    qDebug() << uname_l;
}

---

this shows following output:-

Code:

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uname =  ""
QLineEdit(0x1c323e0, name="lineEditUserNameLoginForm")

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how to get child lineEdit in form.

But what's the problem? You found what you were looking for. Maybe the problem is that you are creating a new instance of the dialogue in line 3.