/// <summary>
/// return a unique device number for the given device path
/// </summary>
/// <param name="devicePath">Device path</param>
/// <returns>Device number</returns>
static int GetDeviceNumber(string devicePath)
{
int ans = -1;
IntPtr h = CreateFile(devicePath.TrimEnd('\\'), 0, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);
if (h == INVALID_HANDLE_VALUE)
{
return(ans);
}
StorageDeviceNumber sdn = new StorageDeviceNumber();
int nBytes = Marshal.SizeOf(sdn);
IntPtr ptrSdn = Marshal.AllocHGlobal(nBytes);
if (DeviceIoControl(h, IOCTL_STORAGE_GET_DEVICE_NUMBER, IntPtr.Zero, 0, ptrSdn, nBytes, out _, IntPtr.Zero))
{
sdn = (StorageDeviceNumber)Marshal.PtrToStructure(ptrSdn, typeof(StorageDeviceNumber));
// just my way of combining the relevant parts of the
// STORAGE_DEVICE_NUMBER into a single number
ans = (sdn.DeviceType << 8) + sdn.DeviceNumber;
}
Marshal.FreeHGlobal(ptrSdn);
CloseHandle(h);
return(ans);
}
internal static extern bool DeviceIoControlGetDeviceNumber(SafeFileHandle hDevice,
WindowsIoctl ioControlCode,
IntPtr inBuffer,
uint nInBufferSize,
ref StorageDeviceNumber outBuffer,
uint nOutBufferSize,
ref uint pBytesReturned,
IntPtr overlapped);
/// <summary>
/// Gets the device number for a specified handle
/// </summary>
/// <param name="deviceHandle">Device handle</param>
/// <returns>Device number</returns>
static uint GetDeviceNumber(SafeFileHandle deviceHandle)
{
StorageDeviceNumber sdn = new StorageDeviceNumber {
deviceNumber = -1
};
uint k = 0;
if (!Extern.DeviceIoControlGetDeviceNumber(deviceHandle, WindowsIoctl.IoctlStorageGetDeviceNumber,
IntPtr.Zero, 0, ref sdn, (uint)Marshal.SizeOf(sdn), ref k,
IntPtr.Zero))
{
return(uint.MaxValue);
}
return((uint)sdn.deviceNumber);
}