private DISK_PERFORMANCE[] GetDiskCounters()
{
DISK_PERFORMANCE[] diskStats = new DISK_PERFORMANCE[m_drives.Length];
for (int i = 0; i < m_drives.Length; i++)
{
var drive = m_drives[i];
if (!drive.Item2.IsClosed && !drive.Item2.IsInvalid)
{
uint bytesReturned;
DISK_PERFORMANCE diskPerf = default(DISK_PERFORMANCE);
try
{
bool result = DeviceIoControl(drive.Item2, IOCTL_DISK_PERFORMANCE,
inputBuffer: IntPtr.Zero,
inputBufferSize: 0,
outputBuffer: out diskPerf,
outputBufferSize: Marshal.SizeOf(typeof(DISK_PERFORMANCE)),
bytesReturned: out bytesReturned,
overlapped: IntPtr.Zero);
if (result)
{
diskStats[i] = diskPerf;
}
}
catch (ObjectDisposedException)
{
// Occasionally the handle is disposed even though it's checked against being closed and valid
// above. In those cases, just catch the failure and continue on to avoid crashes
}
}
}
return(diskStats);
}
public static extern bool DeviceIoControl(
SafeFileHandle deviceHandle,
uint ioControlCode,
IntPtr inputBuffer,
int inputBufferSize,
out DISK_PERFORMANCE outputBuffer,
int outputBufferSize,
out uint bytesReturned,
IntPtr overlapped);
public DrivePerformanceValues ReadThroughputValues()
{
if (handle.IsClosed)
{
throw new ObjectDisposedException("WindowsATASmart");
}
DISK_PERFORMANCE dpf = new DISK_PERFORMANCE();
int size = Marshal.SizeOf <DISK_PERFORMANCE>();
int sizeUsed = 0;
if (NativeMethods.DeviceIoControl(handle, DriveCommand.DiskPerformance, IntPtr.Zero, 0, ref dpf, size, out sizeUsed, IntPtr.Zero) && sizeUsed >= size)
{
return(new DrivePerformanceValues(dpf));
}
return(null);
}
public static extern bool DeviceIoControl(SafeHandle handle,
DriveCommand command, IntPtr inBuffer, int inputSize, ref DISK_PERFORMANCE performance,
int resultSize,
out int bytesReturned, IntPtr overlapped);
/// <nodoc/>
public DiskStats(double?availableDiskSpace = null, DISK_PERFORMANCE diskPerformance = default(DISK_PERFORMANCE))
{
IsValid = true;
AvailableSpaceGb = availableDiskSpace;
DiskPerformance = diskPerformance;
}
