项目中用到了监测某磁盘（如：C盘、D盘等）的总容量和可用容量，查了一下，发现其实挺简单，调用一个Windows自带的API：GetDiskFreeSpaceEx( ... )就可以解决。用Qt做了一个测试例子，如下所示。
另：测试发现，如果给定路径不存在（如程序中"F:\"），则获取不到信息；通常给定用以获取磁盘容量信息的路径为“C:\”、"D:\"等，但给定已存在路径（如程序中"D:\Test"），同样可以获取到该路径所属信息。
示例代码：
#include "acquirediskspace.h"
#include <QtWidgets/QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
AcquireDiskSpace w;
w.show();
return a.exec();
}
#ifndef ACQUIREDISKSPACE_H
#define ACQUIREDISKSPACE_H
#include <QDialog>
class QLineEdit;
class AcquireDiskSpace : public QDialog
{
Q_OBJECT
public:
AcquireDiskSpace( QWidget *parent = 0 );
~AcquireDiskSpace();
protected slots:
void slotDiskChanged( const QString& );
private:
void GetDiskSpace( QString strDisk, double& dTotalBytes, double& dFreeBytes );
private:
QLineEdit* m_pEdtTotalSpace;
QLineEdit* m_pEdtFreeSpace;
};
#endif // ACQUIREDISKSPACE_H
#include "acquirediskspace.h"
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QComboBox>
#include <QGridLayout>
#include <QMessageBox>
#include "windows.h"
AcquireDiskSpace::AcquireDiskSpace( QWidget *parent )
: QDialog( parent )
{
setWindowFlags( Qt::WindowTitleHint );
resize( 400, 400 );
setStyleSheet( "QDialog{background:white;}" );
m_pEdtTotalSpace = new QLineEdit;
m_pEdtTotalSpace->setEnabled( false );
m_pEdtTotalSpace->setMinimumHeight( 30 );
m_pEdtFreeSpace = new QLineEdit;
m_pEdtFreeSpace->setEnabled( false );
m_pEdtFreeSpace->setMinimumHeight( 30 );
//Disk
QComboBox* pCmbDisk = new QComboBox;
pCmbDisk->addItem( "C:/" );
pCmbDisk->addItem( "D:/Test" );
pCmbDisk->addItem( "E:/" );
pCmbDisk->addItem( "F:/" );
pCmbDisk->addItem( "G:/" );
pCmbDisk->setMinimumHeight( 30 );
//Button
QPushButton* pBtnOK = new QPushButton( "OK" );
pBtnOK->setMinimumHeight( 30 );
QHBoxLayout* pBtnLayout = new QHBoxLayout;
pBtnLayout->addWidget( pBtnOK );
//MainLayout
QGridLayout* pMainLayout = new QGridLayout;
pMainLayout->addWidget( new QLabel( "Total:" ), 0, 0, Qt::AlignRight );
pMainLayout->addWidget( m_pEdtTotalSpace, 0, 1 );
pMainLayout->addWidget( new QLabel( "GB" ), 0, 2 );
pMainLayout->addWidget( new QLabel( "Free:" ), 1, 0, Qt::AlignRight );
pMainLayout->addWidget( m_pEdtFreeSpace, 1, 1 );
pMainLayout->addWidget( new QLabel( "GB" ), 1, 2 );
pMainLayout->addWidget( new QLabel( "Disk:" ), 2, 0, Qt::AlignRight );
pMainLayout->addWidget( pCmbDisk, 2, 1 );
pMainLayout->addLayout( pBtnLayout, 3, 1 );
setLayout( pMainLayout );
//connects
connect( pCmbDisk, SIGNAL( currentIndexChanged( const QString& ) ), this, SLOT( slotDiskChanged( const QString& ) ) );
connect( pBtnOK, SIGNAL( clicked() ), this, SLOT( accept() ) );
//Init
QString strDisk = pCmbDisk->currentText();
slotDiskChanged( strDisk );
}
AcquireDiskSpace::~AcquireDiskSpace()
{
}
void AcquireDiskSpace::slotDiskChanged( const QString& strDisk )
{
double dTotalBytes, dFreeBytes;
GetDiskSpace( strDisk, dTotalBytes, dFreeBytes );
m_pEdtTotalSpace->setText( QString::number( dTotalBytes, 'f', 3 ) );
m_pEdtFreeSpace->setText( QString::number( dFreeBytes, 'f', 3 ) );
}
void AcquireDiskSpace::GetDiskSpace( QString strDisk, double& dTotalBytes, double& dFreeBytes )
{
LPCWSTR lpcwstrDriver = (LPCWSTR)strDisk.utf16();
ULARGE_INTEGER lFreeBytesAvailable, lTotalBytesTemp, lTotalFreeBytes;
if( !GetDiskFreeSpaceEx( lpcwstrDriver, &lFreeBytesAvailable, &lTotalBytesTemp, &lTotalFreeBytes ) )
{
QMessageBox::warning( 0, "Warning", "Acquire Disk Space Failed !" );
dTotalBytes = -1;
dFreeBytes = -1;
return;
}
//unit : GB
dTotalBytes = lTotalBytesTemp.QuadPart / 1024.0 / 1024 / 1024;
dFreeBytes = lTotalFreeBytes.QuadPart / 1024.0 / 1024 / 1024;
}结果如下：
(1)C盘：
(2)D盘：
(3)F盘（F盘实际上并不存在，故获取不到，给了默认值-1,-1）
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