Qt开发之获取电脑磁盘容量

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，本文就来用QT实现这一功能吧，希望对大家有所帮助

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：

/*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; }

结果如下：

(1)C盘：