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：
- 可自动加载本地存储设备的总容量/已用容量
- 进度条显示已用容量
- 支持所有操作系统
- 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
四、开源主页
以上作品完整源码下载都在开源主页，会持续不断更新作品数量和质量，欢迎各位关注。