QT textEdit的读取和设置

    /// 读取数据
    QString input_data = ui->textEdit->toPlainText();

    ///插入空格
    QString output_data = "";
    int length = input_data.length();
    for (int i = 0; i < length; i += 2)
    {
        output_data += input_data.mid(i, 2);
        if (i%2 == 0)
        {
            output_data += " ";
        }
    }

    ui->textEdit_2->setPlainText(output_data);