Qt中通过信号槽函数获取发送信号的对象（qobject

在Qt中，可以通过信号槽函数获取发送者对象，主要有两个核心函数qobject_cast<T>()和sender()。用法如下

1.1先通过connect绑定信号槽，代码如下：

QLineEdit *lineEdit = new QLineEdit(); lineEdit->setObjectName("lineEdit"); connect(lineEdit,&QLineEdit::textChanged,this,&slot_lineEditGroup_textChange);

1.2在槽函数中，通过qobject_cast<>()和sender()函数获取发送者对象，代码如下

void QWidget::slot_lineEditGroup_textChange(QString str) {         QLineEdit *lineEdit=qobject_cast<QLineEdit *>(sender());     qDebug()<<"lineEdit->objectName()=="<<lineEdit->objectName(); }

1.3完整代码和输入结果如下所示：  

QLineEdit *lineEdit = new QLineEdit(); lineEdit->setObjectName("lineEdit"); connect(lineEdit,&QLineEdit::textChanged,this,&slot_lineEditGroup_textChange);   void QWidget::slot_lineEditGroup_textChange(QString str) {         QLineEdit *lineEdit=qobject_cast<QLineEdit *>(sender());     qDebug()<<"lineEdit->objectName()=="<<lineEdit->objectName(); }