QPressBar 的基本操作指南

    QProgressBar *pProgressBar = new QProgressBar(this);
    pProgressBar->setFixedWidth(400);
    pProgressBar->setOrientation(Qt::Horizontal);  // 水平方向
    pProgressBar->setMinimum(0);  // 最小值
    pProgressBar->setMaximum(100);  // 最大值
    pProgressBar->setValue(50);  // 当前进度
    double dProgress = (pProgressBar->value() - pProgressBar->minimum()) * 100.0
        / (pProgressBar->maximum() - pProgressBar->minimum());
    pProgressBar->setFormat(QString::fromLocal8Bit("当前进度为：%1%").arg(QString::number(dProgress, 'f', 1)));
    pProgressBar->setAlignment(Qt::AlignVCente