public extern static int DeviceIoControl(
SafeFileHandle hDevice,
uint dwIoControlCode,
[In] ref PREVENT_MEDIA_REMOVAL lpInBuffer,
uint nInBufferSize,
IntPtr lpOutBuffer,
uint nOutBufferSize,
ref uint lpBytesReturned,
IntPtr lpOverlapped);
/// <summary>
///
/// </summary>
/// <param name="aVolume"></param>
/// <param name="aPreventRemoval"></param>
/// <returns></returns>
static private bool PreventRemovalOfVolume(SafeFileHandle aVolume, bool aPreventRemoval)
{
//Hope that's doing what I think it does
IntPtr dwBytesReturned = new IntPtr();
//Should not be needed but I'm not sure how to pass NULL in there.
OVERLAPPED overlapped = new OVERLAPPED();
//
PREVENT_MEDIA_REMOVAL preventMediaRemoval = new PREVENT_MEDIA_REMOVAL();
preventMediaRemoval.PreventMediaRemoval = Convert.ToByte(aPreventRemoval);
IntPtr preventMediaRemovalParam = MarshalToPointer(preventMediaRemoval);
bool result = Function.DeviceIoControl(aVolume, Const.IOCTL_STORAGE_MEDIA_REMOVAL, preventMediaRemovalParam, Convert.ToUInt32(Marshal.SizeOf(preventMediaRemoval)), IntPtr.Zero, 0, dwBytesReturned, ref overlapped);
CheckLastError("Media removal: ");
Marshal.FreeHGlobal(preventMediaRemovalParam);
return(result);
}
public extern static int DeviceIoControl(IntPtr hDevice, uint IoControlCode,
[In] PREVENT_MEDIA_REMOVAL InMediaRemoval, uint InBufferSize,
IntPtr OutBuffer, uint OutBufferSize,
ref uint BytesReturned,
IntPtr Overlapped);
public static void Eject(string driveLetter)
{
if (driveLetterRe.IsMatch(driveLetter))
{
uint returnedBytes = 0;
SafeFileHandle fileHandle = null;
try
{
string driveFileName = createFileNamePrefix + driveLetter.TrimEnd(driveLetterTrimChars);
fileHandle = CreateFile(driveFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);
if (fileHandle.IsInvalid)
{
throw new Win32Exception();
}
// LOCK VOLUME
bool locked = false;
for (int i = 0; i < 20; ++i)
{
if (DeviceIoControl(fileHandle, FSCTL_LOCK_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, out returnedBytes, IntPtr.Zero))
{
locked = true;
break;
}
else
{
Thread.Sleep(500);
}
}
if (false == locked)
{
throw new Win32Exception();
}
// DISMOUNT VOLUME
if (false == DeviceIoControl(fileHandle, FSCTL_DISMOUNT_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, out returnedBytes, IntPtr.Zero))
{
throw new Win32Exception();
}
// ENABLE REMOVAL
var pmr = new PREVENT_MEDIA_REMOVAL { PreventMediaRemoval = false };
int pmrSz = Marshal.SizeOf(pmr);
if (false == DeviceIoControl(fileHandle, IOCTL_STORAGE_MEDIA_REMOVAL, ref pmr, pmrSz, IntPtr.Zero, 0, out returnedBytes, IntPtr.Zero))
{
throw new Win32Exception();
}
// AUTO EJECT
if (false == DeviceIoControl(fileHandle, IOCTL_STORAGE_EJECT_MEDIA, IntPtr.Zero, 0, IntPtr.Zero, 0, out returnedBytes, IntPtr.Zero))
{
throw new Win32Exception();
}
}
finally
{
if (null != fileHandle)
{
fileHandle.Close();
}
}
}
else
{
throw new ArgumentException("Invalid drive letter!", "driveLetter");
}
}
static extern bool DeviceIoControl(SafeFileHandle hDevice, uint dwIoControlCode,
ref PREVENT_MEDIA_REMOVAL lpInBuffer, int nInBufferSize,
IntPtr lpOutBuffer, uint nOutBufferSize, out uint lpBytesReturned, IntPtr lpOverlapped);
public static void Eject(string driveLetter)
{
if (driveLetterRe.IsMatch(driveLetter))
{
uint returnedBytes = 0;
SafeFileHandle fileHandle = null;
try
{
string driveFileName = createFileNamePrefix + driveLetter.TrimEnd(driveLetterTrimChars);
fileHandle = CreateFile(driveFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);
if (fileHandle.IsInvalid)
{
throw new Win32Exception();
}
// LOCK VOLUME
bool locked = false;
for (int i = 0; i < 20; ++i)
{
if (DeviceIoControl(fileHandle, FSCTL_LOCK_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, out returnedBytes, IntPtr.Zero))
{
locked = true;
break;
}
else
{
Thread.Sleep(500);
}
}
if (false == locked)
{
throw new Win32Exception();
}
// DISMOUNT VOLUME
if (false == DeviceIoControl(fileHandle, FSCTL_DISMOUNT_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, out returnedBytes, IntPtr.Zero))
{
throw new Win32Exception();
}
// ENABLE REMOVAL
var pmr = new PREVENT_MEDIA_REMOVAL {
PreventMediaRemoval = false
};
int pmrSz = Marshal.SizeOf(pmr);
if (false == DeviceIoControl(fileHandle, IOCTL_STORAGE_MEDIA_REMOVAL, ref pmr, pmrSz, IntPtr.Zero, 0, out returnedBytes, IntPtr.Zero))
{
throw new Win32Exception();
}
// AUTO EJECT
if (false == DeviceIoControl(fileHandle, IOCTL_STORAGE_EJECT_MEDIA, IntPtr.Zero, 0, IntPtr.Zero, 0, out returnedBytes, IntPtr.Zero))
{
throw new Win32Exception();
}
}
finally
{
if (null != fileHandle)
{
fileHandle.Close();
}
}
}
else
{
throw new ArgumentException("Invalid drive letter!", "driveLetter");
}
}
