Qt獲取電腦磁盤容量
阿新 • • 發佈：2018-05-22
Qt 獲取磁盤容量 獲取磁盤信息 GetDiskFreeSpaceEx 項目中用到了監測某磁盤（如：C盤、D盤等）的總容量和可用容量，查了一下，發現其實挺簡單，調用一個Windows自帶的API：GetDiskFreeSpaceEx( ... )就可以解決。用Qt做了一個測試例子，如下所示。
??另：測試發現，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。
??另：測試發現，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 <QtWidgets/QApplication> 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 <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
/*acquirediskspace.cpp */ #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; }
結果如下：
(1)C盤：
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(2)D盤：
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(3)F盤（F盤實際上並不存在，故獲取不到，給了默認值-1,-1）
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Qt獲取電腦磁盤容量