C# Signature:

[DllImport(@"setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern Boolean SetupDiGetDeviceInterfaceDetail(
   IntPtr hDevInfo,
   ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData,
   ref SP_DEVICE_INTERFACE_DETAIL_DATA deviceInterfaceDetailData,
   UInt32 deviceInterfaceDetailDataSize,
   out UInt32 requiredSize,
   ref SP_DEVINFO_DATA deviceInfoData
);

VB Signature:

Declare Function SetupDiGetDeviceInterfaceDetail Lib "setupapi.dll" (TODO) As TODO

User-Defined Types:

    [StructLayout(LayoutKind.Sequential)]
    public struct SP_DEVINFO_DATA
    {
        public UInt32 cbSize;
        public Guid ClassGuid;
        public UInt32 DevInst;
        public IntPtr Reserved;
    }

    // Device interface data
    [StructLayout(LayoutKind.Sequential)]
    public struct SP_DEVICE_INTERFACE_DATA
    {
        public UInt32 cbSize;
        public Guid InterfaceClassGuid;
        public UInt32 Flags;
        public UInt32 Reserved;
    }

    // Device interface detail data
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct SP_DEVICE_INTERFACE_DETAIL_DATA
    {
        public UInt32 cbSize;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
        public string DevicePath;
    }

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

SP_DEVICE_INTERFACE_DETAIL_DATA needs a ByVal TCHAR[ANYSIZE_ARRAY] member, which could conceivably be any size. This does not bode well for determining the correct size, however DevicePath should be no longer than MAX_PATH (256).

Tips & Tricks:

Please add some!

Sample Code:

Guid DiskGUID = new Guid(GUID_DEVINTERFACE_DISK);

// We start at the "root" of the device tree and look for all
// devices that match the interface GUID of a disk
IntPtr h = SetupDiGetClassDevs(ref DiskGUID, 0, IntPtr.Zero, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
if (h.ToInt32() != INVALID_HANDLE_VALUE)
{
   bool Success = true;
   int i = 0;
   while (Success)
   {
     // create a Device Interface Data structure
     SP_DEVICE_INTERFACE_DATA dia = new SP_DEVICE_INTERFACE_DATA();
     dia.cbSize = Marshal.SizeOf(dia);

     // start the enumeration
     Success = SetupDiEnumDeviceInterfaces(h, IntPtr.Zero, ref DiskGUID, i, ref dia);
     if (Success)
     {
       // build a DevInfo Data structure
       SP_DEVINFO_DATA da = new SP_DEVINFO_DATA();
       da.cbSize = Marshal.SizeOf(da);

       // build a Device Interface Detail Data structure
       SP_DEVICE_INTERFACE_DETAIL_DATA didd = new SP_DEVICE_INTERFACE_DETAIL_DATA();
       if (IntPtr.Size == 8) // for 64 bit operating systems
       didd.cbSize = 8;
       else
       didd.cbSize = 4 + Marshal.SystemDefaultCharSize; // for 32 bit systems

       // now we can get some more detailed information
       int nRequiredSize = 0;
       int nBytes = BUFFER_SIZE;
       if (SetupDiGetDeviceInterfaceDetail(h, ref dia, ref didd, nBytes, ref nRequiredSize, ref da))
       {
         // current InstanceID is at the "USBSTOR" level, so we
         // need up "move up" one level to get to the "USB" level
         IntPtr ptrPrevious;
         CM_Get_Parent(out ptrPrevious, da.DevInst, 0);

         // Now we get the InstanceID of the USB level device
         IntPtr ptrInstanceBuf = Marshal.AllocHGlobal(nBytes);
         CM_Get_Device_ID(ptrPrevious, ptrInstanceBuf, nBytes, 0);
         string InstanceID = Marshal.PtrToStringAuto(ptrInstanceBuf);

         Marshal.FreeHGlobal(ptrInstanceBuf);
       }
     }
   }
   i++;
}
SetupDiDestroyDeviceInfoList(h);

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).