Newbie Q: How to call unmodified VB DLL from Python
andy at robanal.demon.co.uk
Mon Jun 21 20:03:59 CEST 1999
lull at acm.org (John Lull) wrote:
>As a first Python project, I'd like to use Python (or JPython) to
>automate some hardware testing under Win95/98/NT. The hardware in
>question is run by a DLL written in VB, and to which I do not have
>"Extending & Embedding the Python interpreter", ch. 3, has
>instructions for building a DLL which will work, but assumes you're
>working in VC++ and have the source.
>If anyone could point me toward instructions on how to make this work,
>I'd be grateful.
You need to use Sam Rushing's calldll/windll package at
www.nightmare.com. This lets you load and call functions in DLLs
dynamically (i.e. without needing a C compiler). It also provides
python types to emulate C strings and arbitrary memory buffers, so can
Needless to say, it is also possible to crash stuff if you get the
arguments wrong, but once set up it works beautifully. I have been
using it in production round the clock for months now...
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