一、前言

磁盤容量統計控件，說白了，就是用來統計本地盤符占用的容量，包括但不限于已用空間、剩余空間、總大小、已用百分比等，其中對應的百分比采用進度條顯示，該進度條的前景色和背景色及文字顏色可以設置，在整體換膚的時候就需要用到。 本控件的基本上沒有難點可言，就是兼容WIN和LINUX操作系統，在WIN上采用winapi去讀取，linux采用QProcess去執行對應的命令（df -h）獲取結果，然后定時器執行，關聯信號槽獲取返回的額數據解析即可，控件的應用場景主要是在一些嵌入式設備上面，方便用戶查看當前還剩余多少空間。

主要功能： 1. 可自動加載本地存儲設備的總容量/已用容量 2. 進度條顯示已用容量 3. 支持所有操作系統 4. 增加U盤或者SD卡到達信號

二、代碼思路

void DeviceSizeTable::load() {//清空原有數據int row = this->rowCount();for (int i = 0; i < row; i++) {this->removeRow(0);}#ifdef Q_OS_WINQFileInfoList 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);}}#elseprocess->start("df -h"); #endif }void DeviceSizeTable::readData() {while (!process->atEnd()) {QString result = QLatin1String(process->readLine()); #ifdef __arm__if (result.startsWith("/dev/root")) {checkSize(result, "本地存儲");} else if (result.startsWith("/dev/mmcblk")) {checkSize(result, "本地存儲");} 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盤");QStringList list = result.split(" ");emit udiskReceive(list.at(0));} #elseif (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、效果圖

四、開源主頁

以上作品完整源碼下載都在開源主頁，會持續不斷更新作品數量和質量，歡迎各位關注。 1. 國內站點：https://gitee.com/feiyangqingyun/QWidgetDemo 2. 國際站點：https://github.com/feiyangqingyun/QWidgetDemo 3. 個人主頁：https://blog.csdn.net/feiyangqingyun 4. 知乎主頁：https://www.zhihu.com/people/feiyangqingyun/

總結

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