I have written a WM 5.0 CF 3.5 vb.net app that tries to pinvoke
InternetErrorDlg to display a list of certificates to use for authentication
to a web service. I getting the error
ERROR_INVALID_HANDLE. I get this error whether set the hWnd parameter to
Null, the Handle property of the WinForm, or I use GetDesktopWindow from
coredll.dll to obtain the handle. My is code is below. Any help would be
greatly appreciated

<DllImport("WinInet.dll", _
EntryPoint:="InternetErrorDlg", _
CharSet:=CharSet.Unicode, SetLastError:=True)> _
Private Shared Function InternetErrorDlg( _
ByVal hWnd As IntPtr, _
ByRef hRequest As IntPtr, _
ByVal dwError As Int32, _
ByVal dwFlags As Int32, _
ByRef lpdwIndex As Int32) As Int32
End Function

iFlags = FLAGS_ERROR_UI_FLAGS_GENERATE_DATA +
FLAGS_ERROR_UI_FLAGS_CHANGE_OPTIONS
lppvData = IntPtr.Zero
hWnd = GetDesktopWindow()
iResult = InternetErrorDlg(hWnd, m_Request, iError,
iFlags, lppvData)
Select Case iResult

Case ERROR_SUCCESS

Case ERROR_CANCELLED
m_ErrorMessage = "The function was canceled
by the user"

Case ERROR_INTERNET_FORCE_RETRY
m_ErrorMessage = "Function needs to redo its
request"

Case ERROR_INVALID_HANDLE
m_ErrorMessage = "InternetErrorDlg: The
handle to the parent window is invalid"
Case Else
m_ErrorMessage = "InternetErrorDlg: Error #"
+ iResult.ToString()
End Select