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Newsgroups: comp.lang.python
Date: Fri, 12 Oct 2012 10:52:38 -0700 (PDT)
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Subject: Re: Checking for dlls in ctypes
From: Wanderer <wanderer@dialup4less.com>
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On Friday, October 12, 2012 12:57:06 PM UTC-4, MRAB wrote:
> On 2012-10-12 16:36, Wanderer wrote:
> 
> > I'm trying to write some code that will load one of three dll depending on the one available. I've tried the code below, but it doesn't work. The try except doesn't catch the exception. Is there a way to do this?
> 
> >
> 
> >          try:
> 
> >              self.dll = windll.pvcam64
> 
> >          except:
> 
> >              print "No pvcam64"
> 
> >              try:
> 
> >                  self.dll = windll.pvcam32
> 
> >              except:
> 
> >                  print "No pvcam32"
> 
> >                  try:
> 
> >                      self.dll = windll.pvcam
> 
> >                  except:
> 
> >                      print "No pvcam"
> 
> >                      return
> 
> >                  else:
> 
> >                      print "installed pvcam"
> 
> >              else:
> 
> >                  print "installed pvcam32"
> 
> >          else:
> 
> >              print "installed pvcam64"
> 
> >
> 
> This works for me:
> 
> 
> 
>      for name in ("pvcam64", "pvcam32", "pvcam"):
> 
>          try:
> 
>              self.dll = getattr(windll, name)
> 
>          except OSError:
> 
>              print "No " + name
> 
>          else:
> 
>              print "Installed " + name
> 
>              return

Yes that works for me, too. Thanks