omap3530 spi driver usage from c# on wince6.0 with BSP6.09

Hy,

I am newbe in the WINCE, and i want to use the spi driver of the BSP6.09 (<2/06/2009> 6.09.00) on WINCE6.0. I write the api in c# to use the spi driver. I viewed in the Microsoft Remote Tools Shell which drivers loaded and the spi1 was loaded.  I use the following pinvokes:

[DllImport("coredll", SetLastError = true)]
internal static extern int DeviceIoControl(
UInt32 hDevice,
UInt32 dwIoControlCode,
IntPtr lpInBuffer,
UInt32 nInBufferSize,
IntPtr lpOutBuffer,
UInt32 nOutBufferSize,
UInt32 lpBytesReturned,
IntPtr lpOverlapped
);

[DllImport("coredll.dll", EntryPoint = "CreateFile", SetLastError = true)]
private static extern IntPtr CreateFile(
string lpFileName, // pointer to name of the file
UInt32 dwDesiredAccess, // access (read-write) mode
UInt32 dwShareMode, // share mode
IntPtr lpSecurityAttributes, // pointer to security attributes
UInt32 dwCreationDisposition, // how to create
UInt32 dwFlagsAndAttributes, // file attributes
IntPtr hTemplateFile // handle to file with attributes to copy
);

And the fuction calls: 

IntPtr hSPI = IntPtr.Zero;
int error;

DEVICE_CONTEXT_SPI context = new DEVICE_CONTEXT_SPI();

try
{

    hSPI = CreateFile("SPI1:", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
    IntPtr.Zero, CREATE_NEW, 1, IntPtr.Zero);

    error = Marshal.GetLastWin32Error();

    MessageBox.Show(" CreateFile error: " + error);
}
catch (Exception ex)
{
    error = Marshal.GetLastWin32Error();

    MessageBox.Show(ex.ToString() + " The last Win32 Error was: " + error);
}

UInt32 IOCTL_DDK_GET_DRIVER_IFC = CTL_CODE(FILE_DEVICE_UNKNOWN, 0x0100,
METHOD_BUFFERED, FILE_ANY_ACCESS);
//new guid // {0FB30280-7D17-4e29-9245-9EFF57B1AA91}0xfb30280, 0x7d17, 0x4e29, 0x92, 0x45, 0x9e, 0xff, 0x57, 0xb1, 0xaa, 0x91
Guid DEVICE_IFC_SPI_GUID = new Guid((int)0x2e559225, unchecked((short)0xc95e), (short)0x4300, 0x86, 0xe9, 0x6a, 0x5c, 0xbc, 0x7, 0x32, 0x8f);

IntPtr p_DEVICE_IFC_SPI_GUID = Marshal.AllocHGlobal(Marshal.SizeOf(DEVICE_IFC_SPI_GUID));
Marshal.StructureToPtr(DEVICE_IFC_SPI_GUID, p_DEVICE_IFC_SPI_GUID, false);

IntPtr pContext_ifc = Marshal.AllocHGlobal(Marshal.SizeOf(context.ifc));
Marshal.StructureToPtr(context.ifc, pContext_ifc, false);

MessageBox.Show("pContext: " + pContext_ifc.ToString());

DeviceIoControl((UInt32)hSPI.ToInt32(), IOCTL_DDK_GET_DRIVER_IFC, p_DEVICE_IFC_SPI_GUID,
(uint)sizeof(Guid), pContext_ifc, (uint)sizeof(DEVICE_IFC_SPI), 0, IntPtr.Zero);

error = Marshal.GetLastWin32Error();

MessageBox.Show(" DeviceIO error: " + error);

And the deviceIO error are always 5 which means ERROR_ACCESS_DENIED.

In the driver code:

if (GetCurrentProcessId() != (DWORD)GetCallerProcess()) {
    DEBUGMSG(ZONE_ERROR, (L"ERROR: SPI_IOControl: "
    L"IOCTL_DDK_GET_DRIVER_IFC can be called only from "
    L"device process (caller process id 0x%08x)\r\n",
    GetCallerProcess()
    ));
SetLastError(ERROR_ACCESS_DENIED);
    goto clean;

I think this line send me this error. How can I fix it or handle the deviceIOControl in the right way? Is it possible that I can not use this driver because the kernel loaded it?

I will be grateful for any help. (sorry for my poor english).

Steve