public static extern bool SetupDiGetDeviceInterfaceDetail(SafeFileHandle hDevInfo,
ref DeviceInterfaceData deviceInterfaceData,
IntPtr deviceInterfaceDetailData,
uint deviceInterfaceDetailDataSize,
ref uint requiredSize,
IntPtr deviceInfoData);
/// <summary>
/// Gets the internal device path for a specified handle
/// </summary>
/// <param name="fd">Device handle</param>
/// <returns>Device path</returns>
internal static string GetDevicePath(SafeFileHandle fd)
{
uint devNumber = GetDeviceNumber(fd);
if (devNumber == uint.MaxValue)
{
return(null);
}
SafeFileHandle hDevInfo = Extern.SetupDiGetClassDevs(ref Consts.GuidDevinterfaceDisk, IntPtr.Zero,
IntPtr.Zero,
DeviceGetClassFlags.Present |
DeviceGetClassFlags.DeviceInterface);
if (hDevInfo.IsInvalid)
{
return(null);
}
uint index = 0;
DeviceInterfaceData spdid = new DeviceInterfaceData();
spdid.cbSize = Marshal.SizeOf(spdid);
while (true)
{
byte[] buffer = new byte[2048];
if (!Extern.SetupDiEnumDeviceInterfaces(hDevInfo, IntPtr.Zero, ref Consts.GuidDevinterfaceDisk, index,
ref spdid))
{
break;
}
uint size = 0;
Extern.SetupDiGetDeviceInterfaceDetail(hDevInfo, ref spdid, IntPtr.Zero, 0, ref size, IntPtr.Zero);
if (size > 0 && size < buffer.Length)
{
buffer[0] = (byte)(IntPtr.Size == 8
? IntPtr.Size
: IntPtr.Size + Marshal.SystemDefaultCharSize); // Funny...
IntPtr pspdidd = Marshal.AllocHGlobal(buffer.Length);
Marshal.Copy(buffer, 0, pspdidd, buffer.Length);
bool result =
Extern.SetupDiGetDeviceInterfaceDetail(hDevInfo, ref spdid, pspdidd, size, ref size,
IntPtr.Zero);
buffer = new byte[size];
Marshal.Copy(pspdidd, buffer, 0, buffer.Length);
Marshal.FreeHGlobal(pspdidd);
if (result)
{
string devicePath = Encoding.Unicode.GetString(buffer, 4, (int)size - 4);
SafeFileHandle hDrive = Extern.CreateFile(devicePath, 0, FileShare.Read | FileShare.Write,
IntPtr.Zero, FileMode.OpenExisting, 0, IntPtr.Zero);
if (!hDrive.IsInvalid)
{
uint newDeviceNumber = GetDeviceNumber(hDrive);
if (newDeviceNumber == devNumber)
{
Extern.CloseHandle(hDrive);
return(devicePath);
}
}
Extern.CloseHandle(hDrive);
}
}
index++;
}
Extern.SetupDiDestroyDeviceInfoList(hDevInfo);
return(null);
}
public static extern bool SetupDiEnumDeviceInterfaces(SafeFileHandle hDevInfo,
IntPtr devInfo,
ref Guid interfaceClassGuid,
uint memberIndex,
ref DeviceInterfaceData deviceInterfaceData);
