qt 获取系统磁盘空间大小

quint64 getDiskFreeSpace(QString driver)

{

 LPCWSTR lpcwstrDriver=(LPCWSTR)driver.utf16();

 ULARGE_INTEGER liFreeBytesAvailable, liTotalBytes, liTotalFreeBytes;

 if( !GetDiskFreeSpaceEx( lpcwstrDriver, &liFreeBytesAvailable, &liTotalBytes, &liTotalFreeBytes) )

 {

  qDebug() << "ERROR: Call to GetDiskFreeSpaceEx() failed.";

  return 0;

 }

 return (quint64) liTotalFreeBytes.QuadPart/1024/1024/1024;

}

//调用时：

quint64 freeSpace =getDiskFreeSpace(QString("C:/"));

qDebug() << "剩余空间 " << freeSpace<< "GB";//输出磁盘剩余空间大小