DeviceType using SetupDiGetDeviceRegistryPropert in VB.net

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VB

Visual-Studio

PInvoke

Hi all.

I've got a problem while working with SetupApi calls.
I need to retrieve a device type from a device.


The I used to get it:

    <DllImport("setupapi.dll", SetLastError:=True)> _
    Public Shared Function SetupDiGetDeviceRegistryProperty( _
        ByVal DeviceInfoSet As IntPtr, _
        ByRef DeviceInfoData As SP_DEVINFO_DATA, _
        ByVal [Property] As Win32.SetupDiGetDeviceRegistryPropertyEnum, _
        ByRef PropertyRegDataType As Integer, _
        ByRef PropertyBuffer As Integer, _
        ByVal PropertyBufferSize As Integer, _
        ByRef RequiredSize As Integer) As Boolean
    End Function

''' some code here


Dim result As Int32
 Dim RequiredSize As Integer
 Dim DataType As Integer = 4
 Dim returnVal As Boolean = Win32.SetupDiGetDeviceRegistryProperty(hDevInfo, DevInfoData, Win32.SetupDiGetDeviceRegistryPropertyEnum.SPDRP_DEVTYPE, _
                                                                    DataType, result, 4, RequiredSize)

But returnVal is always FALSE, and I'm getting an win32error 13 (ERROR_INVALID_DATA).
I don't know what I am doing wrong, because I can get other properties.


Suggestions??

Thanks