項(xiàng)目中用到了監(jiān)測某磁盤(如：C盤、D盤等)的總?cè)萘亢涂捎萌萘?#xff0c;查了一下，發(fā)現(xiàn)其實(shí)挺簡單，調(diào)用一個(gè)Windows自帶的API：GetDiskFreeSpaceEx( ... )就可以解決。用Qt做了一個(gè)測試?yán)?#xff0c;如下所示。

??另：測試發(fā)現(xiàn)，如果給定路徑不存在(如程序中"F:\")，則獲取不到信息；通常給定用以獲取磁盤容量信息的路徑為“C:\”、"D:\"等，但給定已存在路徑(如程序中"D:\Test")，同樣可以獲取到該路徑所屬信息。

示例代碼：

/*main.cpp*/

#include "acquirediskspace.h"

#include

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

AcquireDiskSpace w;

w.show();

return a.exec();

}

/*acquirediskspace.h */

#ifndef ACQUIREDISKSPACE_H

#define ACQUIREDISKSPACE_H

#include

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

/*acquirediskspace.cpp */

#include "acquirediskspace.h"

#include

#include

#include

#include

#include

#include

#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;

}

結(jié)果如下：

(1)C盤：

??

(2)D盤：

??

(3)F盤(F盤實(shí)際上并不存在，故獲取不到，給了默認(rèn)值-1,-1)

??

總結(jié)

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