QT中edit控件限制输入数值以及进制转换方法

/* 限制输入 */
    ui->edit_2->setValidator(new QRegExpValidator(QRegExp("[0-1]+$")));//输入0跟1
    ui->edit_8->setValidator(new QRegExpValidator(QRegExp("[0-7]+$")));//输入0到7
    ui->edit_10->setValidator(new QRegExpValidator(QRegExp("[0-9]+$")));//输入0到9

QString binary = ui->edit_2->text();
    unsigned long long value = 0;
    /* 解决long存储数据限制改用方法二 */
    int count = 0;
    QString buff;
    for (int i = binary.length() - 1; i >= 0; i--)
    {
        buff = binary.at(i);
        value += buff.toInt() * qPow(2, count++);
    }
    ui->edit_8->setText(QString::number(value, 8));
    ui->edit_10->setText(QString::number(value, 10));
    ui->edit_16->setText(QString::number(value, 16).toUpper());