QTextEdit

    QString str = ui->textEdit->toPlainText();

    qDebug()<<str;    //输出textEdit中写的字符串

    ui->textEdit->setPlainText("hello");    //设置textEdit中的内容为"hello"

    QString str= ui->textEdit->toHtml();
    //上面这句可以换成这句：QString str= ui->textEdit->toPlainText();
    QTextEdit *ss=new QTextEdit;
    ss->move(200,100);    //设置textEdit的起始坐标为(200,100)
    ss->resize(400,100);    //设置textEdit的大小为长400，宽100
    ss->setText(str);
    ss->show();    //按上面设定的起始坐标和大小展示出来