Qt如何实现硬盘容量控件

小编给大家分享一下Qt如何实现硬盘容量控件，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

一、前言

磁盘容量统计控件，说白了，就是用来统计本地盘符占用的容量，包括但不限于已用空间、剩余空间、总大小、已用百分比等，其中对应的百分比采用进度条显示，该进度条的前景色和背景色及文字颜色可以设置，在整体换肤的时候就需要用到。 本控件的基本上没有难点可言，就是兼容WIN和LINUX操作系统，在WIN上采用winapi去读取，linux采用QProcess去执行对应的命令（df -h）获取结果，然后定时器执行，关联信号槽获取返回的额数据解析即可，控件的应用场景主要是在一些嵌入式设备上面，方便用户查看当前还剩余多少空间。

主要功能：

1. 可自动加载本地存储设备的总容量/已用容量

2. 进度条显示已用容量

3. 支持所有操作系统

4. 增加U盘或者SD卡到达信号

二、代码思路

void DeviceSizeTable::load(){    //清空原有数据    int row = this->rowCount();    for (int i = 0; i < row; i++) {        this->removeRow(0);    }#ifdef Q_OS_WIN    QFileInfoList list = QDir::drives();    foreach (QFileInfo dir, list) {        QString dirName = dir.absolutePath();        LPCWSTR lpcwstrDriver = (LPCWSTR)dirName.utf16();        ULARGE_INTEGER liFreeBytesAvailable, liTotalBytes, liTotalFreeBytes;        if (GetDiskFreeSpaceEx(lpcwstrDriver, &liFreeBytesAvailable, &liTotalBytes, &liTotalFreeBytes)) {            QString use = QString::number((double)(liTotalBytes.QuadPart - liTotalFreeBytes.QuadPart) / GB, 'f', 1);            use += "G";            QString free = QString::number((double) liTotalFreeBytes.QuadPart / GB, 'f', 1);            free += "G";            QString all = QString::number((double) liTotalBytes.QuadPart / GB, 'f', 1);            all += "G";            int percent = 100 - ((double)liTotalFreeBytes.QuadPart / liTotalBytes.QuadPart) * 100;            insertSize(dirName, use, free, all, percent);        }    }#else    process->start("df -h");#endif}void DeviceSizeTable::readData(){    while (!process->atEnd()) {        QString result = QLatin1String(process->readLine());#ifdef __arm__        if (result.startsWith("/dev/root")) {            checkSize(result, "本地存储");        } else if (result.startsWith("/dev/mmcblk")) {            checkSize(result, "本地存储");        } else if (result.startsWith("/dev/mmcblk1p")) {            checkSize(result, "SD卡");            QStringList list = result.split(" ");            emit sdcardReceive(list.at(0));        } else if (result.startsWith("/dev/sd")) {            checkSize(result, "U盘");            QStringList list = result.split(" ");            emit udiskReceive(list.at(0));        }#else        if (result.startsWith("/dev/sd")) {            checkSize(result, "");            QStringList list = result.split(" ");            emit udiskReceive(list.at(0));        }#endif    }}void DeviceSizeTable::checkSize(const QString &result, const QString &name){    QString dev, use, free, all;    int percent = 0;    QStringList list = result.split(" ");    int index = 0;    for (int i = 0; i < list.count(); i++) {        QString s = list.at(i).trimmed();        if (s == "") {            continue;        }        index++;        if (index == 1) {            dev = s;        } else if (index == 2) {            all = s;        } else if (index == 3) {            use = s;        } else if (index == 4) {            free = s;        } else if (index == 5) {            percent = s.left(s.length() - 1).toInt();            break;        }    }    if (name.length() > 0) {        dev = name;    }    insertSize(dev, use, free, all, percent);}void DeviceSizeTable::insertSize(const QString &name, const QString &use, const QString &free, const QString &all, int percent){    int row = this->rowCount();    this->insertRow(row);    QTableWidgetItem *itemname = new QTableWidgetItem(name);    QTableWidgetItem *itemuse = new QTableWidgetItem(use);    itemuse->setTextAlignment(Qt::AlignCenter);    QTableWidgetItem *itemfree = new QTableWidgetItem(free);    itemfree->setTextAlignment(Qt::AlignCenter);    QTableWidgetItem *itemall = new QTableWidgetItem(all);    itemall->setTextAlignment(Qt::AlignCenter);    this->setItem(row, 0, itemname);    this->setItem(row, 1, itemuse);    this->setItem(row, 2, itemfree);    this->setItem(row, 3, itemall);    QProgressBar *bar = new QProgressBar;    bar->setRange(0, 100);    bar->setValue(percent);    QString qss = QString("QProgressBar{background:%1;border-width:0px;border-radius:0px;text-align:center;}"                          "QProgressBar::chunk{border-radius:0px;}").arg(bgColor.name());    if (percent < 50) {        qss += QString("QProgressBar{color:%1;}QProgressBar::chunk{background:%2;}").arg(textColor1.name()).arg(chunkColor1.name());    } else if (percent < 90) {        qss += QString("QProgressBar{color:%1;}QProgressBar::chunk{background:%2;}").arg(textColor2.name()).arg(chunkColor2.name());    } else {        qss += QString("QProgressBar{color:%1;}QProgressBar::chunk{background:%2;}").arg(textColor3.name()).arg(chunkColor3.name());    }    bar->setStyleSheet(qss);    this->setCellWidget(row, 4, bar);}

三、效果图

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