Cython is the easiest. But using the C API for this is extremely easy. Just pull the integer and cast to size_t and then void *.
Niall On 1 May 2012 at 10:21, Ehsan Pi wrote: > Thanks Niall for your response and correction on HWND. > I'm new to Python (and Boost.Python for that matter) and thought Python was > not typed. If not, how can one convert Python integers to void*? Googled > but didn't find an answer. > > Regards, > Ehsan > > > On Tue, May 1, 2012 at 9:18 AM, Niall Douglas > <s_sourcefo...@nedprod.com>wrote: > > > A HWND is always a void * i.e. an opaque pointer. Unfortunately some > > people using BPL think that BPL can't handle opaque pointers, so they > > do fun stuff like use a thunk struct type for void * instead, and > > wrap the lot in manual pointer casting. It's far easier just to > > declare it an opaque pointer and be done with it. > > > > It is very unfortunate indeed that win32gui returns a HWND as an > > integer. It isn't an integer and must not be treated as one. Still, > > it's easy to write a routine which converts python integers to void > > *. > > > > Niall > > > > > > On 30 Apr 2012 at 14:54, Ehsan Pi wrote: > > > > > Thanks Roman for your quick reply, > > > > > > That's what confuses me. HWND is essentially a pointer to an int to hold > > > the window handle. How can to convert them to each other? > > > > > > Ehsan > > > > > > On Mon, Apr 30, 2012 at 2:46 PM, Roman Yakovenko > > > <roman.yakove...@gmail.com>wrote: > > > > > > > On Mon, Apr 30, 2012 at 9:11 PM, Ehsan Pi <ehsan...@gmail.com> wrote: > > > > > In python I get the not-match error: > > > > > > > > > > >>> import MyWrapper > > > > > >>> import win32gui > > > > > >>> hwnd = win32gui.GetDesktopWindow() > > > > > >>> foo = MyWrapper.Foo(hwnd) > > > > > Traceback (most recent call last): > > > > > File "<stdin>", line 1, in <module> > > > > > Boost.Python.ArgumentError: Python argument types in > > > > > Foo.__init__(Foo, int) > > > > > did not match C++ signature: > > > > > __init__(struct _object *, struct HWND__ * window) > > > > > >>> > > > > > > > > > > How can I correct this problem to be able to pass a window's handle > > (from > > > > > win32gui) in Python to C++ class, and interact with it? > > > > > > > > I think the error is pretty clear: the exported constructor expects a > > > > pointer to some struct(?) HWND__, while, win32gui returns the handle > > > > as integer. You will have to find some way to associate handle as > > > > integer with handle as HWND__. Once you find it, you can use > > > > "make_constructor" functionality, which is also supported by py++. > > > > > > > > HTH. > > > > _______________________________________________ > > > > Cplusplus-sig mailing list > > > > Cplusplus-sig@python.org > > > > http://mail.python.org/mailman/listinfo/cplusplus-sig > > > > > > > > > > > > > -- > > Technology & Consulting Services - ned Productions Limited. > > http://www.nedproductions.biz/. VAT reg: IE 9708311Q. > > Work Portfolio: http://careers.stackoverflow.com/nialldouglas/ > > > > > > > > _______________________________________________ > > Cplusplus-sig mailing list > > Cplusplus-sig@python.org > > http://mail.python.org/mailman/listinfo/cplusplus-sig > > > -- Technology & Consulting Services - ned Productions Limited. http://www.nedproductions.biz/. VAT reg: IE 9708311Q. Work Portfolio: http://careers.stackoverflow.com/nialldouglas/ _______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org http://mail.python.org/mailman/listinfo/cplusplus-sig
