qt01 lineEdit pushButton

1. void udp_server::on_lineEdit_textEdited()

{

    ui->pushButton->setEnabled(ui->lineEdit->hasAcceptableInput());

}
2. 撤销ctrl+z
3.信号槽函数定义

signals:

    void readyRead();

private slots:

    void on_pushButton_clicked();
4.控制台打印

qDebug() << "aaa";