pinvoke.net: Edit: setupapi.SetupDiGetDeviceInterfaceDetail

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Summary: Used with SetupDiGetClassDevs and SetupDiEnumDeviceInterfaces to retrieve a device path name

!!!!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,
   ref UInt32 requiredSize,
   ref SP_DEVINFO_DATA deviceInfoData
 );

!!!!VB Signature:
 Public Declare Auto Function SetupDiGetDeviceInterfaceDetail2 Lib "setupapi.dll" Alias "SetupDiGetDeviceInterfaceDetailW" ( _
	ByVal hDevInfo As IntPtr, _
	ByRef deviceInterfaceData As SP_DEVICE_INTERFACE_DATA, _
	ByRef deviceInterfaceDetailData As SP_DEVICE_INTERFACE_DETAIL_DATA, _
	ByVal deviceInterfaceDetailDataSize As Int32, _
	ByRef requiredSize As Int32, _
	ByRef deviceInfoData As SP_DEVINFO_DATA) As Boolean

!!!!VB.net Signature
 Public Declare Auto Function SetupDiGetDeviceInterfaceDetail Lib "setupapi.dll" ( _
        ByVal DeviceInfoSet As IntPtr, _
        ByRef DeviceInterfaceData As SP_DEVICE_INTERFACE_DATA, _
        ByRef DeviceInterfaceDetailData As SP_DEVICE_INTERFACE_DETAIL_DATA, _
        ByVal DeviceInterfaceDetailDataSize As UInteger, _
        ByRef RequiredSize As UInteger, _
        ByRef DeviceInfoData As SP_DEVINFO_DATA) As Boolean '

!!!!C# User-Defined Types:
[SP_DEVINFO_DATA]
[SP_DEVICE_INTERFACE_DATA]
[SP_DEVICE_INTERFACE_DETAIL_DATA]

!!!!VB User-Defined Types:
[SP_DEVINFO_DATA]
[SP_DEVICE_INTERFACE_DATA]
[SP_DEVICE_INTERFACE_DETAIL_DATA]

!!!!VB.net User-Defined Types:
[SP_DEVINFO_DATA]
[SP_DEVICE_INTERFACE_DATA]
[SP_DEVICE_INTERFACE_DETAIL_DATA]

!!!!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:
On the VB side i could not get a valid result passing nulls to the optional parameters, but passing initialized structures seems to work fine.

!!!!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
       uint 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);

!!!!Sample Code:
 'goes through all devices matching the HID guid and finds one with a registry entry string matching the name of the desired HID device, in this case a Midi device

Public Enum Reg_Types
  	 REG_SZ = 1
    	 REG_BINARY = 3
   	 REG_DWORD = 4
   	 REG_MULTI_SZ = 7
	End Enum
 
 Function findMIDIKeyAndDescriptor() As Boolean
	Dim devEnumInterfaceResult, devDetailResult, devEnumResult, destructionResult, registryPropertyResult As Boolean
        Dim reqedBuffer As UInteger
        Dim foundIt As Boolean
        Dim startRow, searchStringPos As Integer
       	Dim loopSafety As Integer
 	Dim myGuid As Guid
   	Dim strTemp, errorString, ControllerDeviceDesc, ControllerDriverKey As String
   	Dim h, midih As IntPtr
   	Dim da, da2 As SP_DEVINFO_DATA
   	Dim dia As SP_DEVICE_INTERFACE_DATA
   	Dim didd As SP_DEVICE_INTERFACE_DETAIL_DATA = Nothing
	Dim dwChars, errorCode As Long
    	Dim bufptr As IntPtr = IntPtr.Zero
	Dim count, i, j As Integer
	Dim MidiDevName As String
 	
	MidiDevName  = "inputwave"
      	loopSafety = 2000
 
        Call HidD_GetHidGuid(myGuid)
        h = SetupDiGetClassDevs(myGuid, 0, IntPtr.Zero, DIGCF_PRESENT + DIGCF_DEVICEINTERFACE) '
 
 
        da.cbSize = SizeOf(da)
        dia.cbSize = SizeOf(dia)
        didd.cbSize = 6 '+' Marshal.SystemDefaultCharSize + Sizeof(intptr.zero)
        devEnumResult = True
        devEnumInterfaceResult = True
        reqedBuffer = 0
 
 
 
 
        i = -1
        foundIt = False
 
        Do While devEnumResult And i < loopSafety And devEnumInterfaceResult And Not foundIt
            i = i + 1
            devEnumResult = SetupDiEnumDeviceInfo(h, i, da)
 
            errorCode = Err.LastDllError
 
            devEnumInterfaceResult = SetupDiEnumDeviceInterfaces(h, IntPtr.Zero, myGuid, i, dia)
 
            If errorCode Then
                errorString = ErrorDescriptionDLL(errorCode)
                errorCode = 0
            End If
 
 
            If devEnumInterfaceResult And devEnumResult Then
 
                devDetailResult = SetupDiGetDeviceInterfaceDetail(h, dia, didd, 1000, reqedBuffer, da) 
			'reqedBuffer turns out as 170, this will be diffent on different machines/OS, 
			'1000 is used as an arbitrarly large number, i found that if this was too small then I would get an error
                errorCode = Err.LastDllError
 
                devDetailResult = SetupDiGetDeviceInterfaceDetail(h, dia, didd, reqedBuffer, reqedBuffer, da)
 
                If devDetailResult Then
 
                    Dim RegType As UInt32 = Reg_Types.REG_SZ
                    Dim RequiredSize As UInt32
                    Dim KeyName As String = ""
                    Dim ptrButter As IntPtr
                    ptrButter = Marshal.AllocHGlobal(40)
 
                    'get the right buffer size for the device description
                    registryPropertyResult = SetupDiGetDeviceRegistryProperty(h, da, DeviceRegistryValueNames.SPDRP_DEVICEDESC, RegType, ptrButter, 0, RequiredSize)
                    ptrButter = Marshal.AllocHGlobal(CInt(RequiredSize))
 
                    registryPropertyResult = SetupDiGetDeviceRegistryProperty(h, da, DeviceRegistryValueNames.SPDRP_DEVICEDESC, RegType, ptrButter, RequiredSize, RequiredSize)
                    If registryPropertyResult Then
                        ControllerDeviceDesc = Marshal.PtrToStringAuto(ptrButter, RequiredSize)   
                    End If
 
                    'get the right buffer size for returning the driver key
                    registryPropertyResult = SetupDiGetDeviceRegistryProperty(h, da, DeviceRegistryValueNames.SPDRP_DRIVER, RegType, ptrButter, RequiredSize, RequiredSize)
                    ptrButter = Marshal.AllocHGlobal(CInt(RequiredSize))
 
                    registryPropertyResult = SetupDiGetDeviceRegistryProperty(h, da, DeviceRegistryValueNames.SPDRP_DRIVER, RegType, ptrButter, RequiredSize, RequiredSize)
                    If registryPropertyResult Then
                        ControllerDriverKey = Marshal.PtrToStringAuto(ptrButter, RequiredSize)
                       
                        searchStringPos = InStr(didd.DevicePath, MidiDevName)
                        If searchStringPos > 0 Then
                            foundIt = True
                        End If
                    End If
 
                    errorCode = Err.LastDllError
                Else
                    errorCode = Err.LastDllError
                End If
 
            End If
 
            errorCode = Err.LastDllError
 
        Loop
 
 
 
        destructionResult = SetupDiDestroyDeviceInfoList(h)
       
 
        If foundIt Then
            findMIDIKeyAndDescriptor = True
        Else
            findMIDIKeyAndDescriptor = False
        End If
 
 
    End Function

Documentation: SetupDiGetDeviceInterfaceDetail@msdn on MSDN