[IronPython] Null pointer passing

[Kaveripakam, Sathish]

HI All,
 
I am trying to call  Windows CreateFile function from iron Python. I
have a dll (c# dll , which has "extern entry" to Create File and I am
importing  Kernel32.dll). The problem is, when I am trying to pass the
arguments, which is of null type, I used "None" in the iron python.  But
during execution, I get an error saying that "Expected IntPtr but got
NoneType". 
 
Could you please let me know, if I am missing something, which is
primitive .
 
 
Iron python Call:
 
x = Win_dll.CreateFile( '\\\\.\\TEST\\test',
                                    GENERIC_READ|GENERIC_WRITE ,
                                    FILE_SHARE_READ|FILE_SHARE_WRITE,
                                    None,
                                    OPEN_EXISTING,
                                    FILE_FLAG_WRITE_THROUGH,
                                    None
                                )

 
public class Win_dll{

                    [DllImport("Kernel32.dll")]

                  public static extern IntPtr CreateFile( string
FileName, uint DesiredAccess, uint ShareMode,IntPtr
SecurityAttributes,uint CreationDisposition,uint
FlagsAndAttributes,IntPtr TemplateFile);

}}


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