[Python-Dev] Handling support for newer OS features at run time

Trent Nelson trent at snakebite.org
Wed Nov 28 00:30:28 CET 2012

On Tue, Nov 27, 2012 at 03:14:00PM -0800, Richard Oudkerk wrote:
> On 27/11/2012 10:49pm, Trent Nelson wrote:
> >      Ideally, a Windows binary should make WSAPoll/select.poll()
> >      available if running on Vista or above, without impacting
> >      the ability to run on XP.
> I assume you can do something like
>      int WSAAPI (*pWSAPoll)(WSAPOLLFD *, ULONG, INT);
>      HINSTANCE hWinsock2 = GetModuleHandle("WS2_32");
>      *(FARPROC *)&pWSAPoll = GetProcAddress(hWinsock2, "WSAPoll");
>      if (pWSAPoll == NULL)
>          ...
> to get a function pointer for WSAPoll on versions which support it.

    Ah!  Good point, that's probably a much better approach in this
    instance, given I only need one or two more symbols.  Thanks!


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