Need help calling a proprietary C DLL from Python

[Craig]

On Mar 20, 2:38 pm, Craig <craigm3... at gmail.com> wrote:
> On Mar 20, 2:29 pm, sturlamolden <sturlamol... at yahoo.no> wrote:
>
> > On 20 Mar, 19:09, Craig <craigm3... at gmail.com> wrote:
>
> > The culprit i here:
>
> > > Before - X = 0, CacheSize = 0, OpenMode = 3, vHandle = 0
>
> > This binds these names to Python ints, but byref expects C types.
>
> > Also observe that CacheSize and OpenMode should be c_short.
>
> I changed CacheSize and OpenMode to c_short, and commented out that
> line producing the "Before" message, and the output is the same.
>
> Further "tinkering" revealed that it is the byref on the fName and pw
> that are causing the error.
>
> The entire problem appears to be around the production of a BSTR and
> the passing of pointers (byref) to the BSTR.


Can anyone shed some light on how to work with BSTR's?