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();

原文：https://www.cnblogs.com/xpylovely/p/10899905.html