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Groups > comp.lang.python > #31168

Re: Checking for dlls in ctypes

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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

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Checking for dlls in ctypes Wanderer <wanderer@dialup4less.com> - 2012-10-12 08:36 -0700
  Re: Checking for dlls in ctypes Dave Angel <d@davea.name> - 2012-10-12 12:28 -0400
    Re: Checking for dlls in ctypes Wanderer <wanderer@dialup4less.com> - 2012-10-12 10:57 -0700
    Re: Checking for dlls in ctypes Wanderer <wanderer@dialup4less.com> - 2012-10-12 10:57 -0700
    Re: Checking for dlls in ctypes Nobody <nobody@nowhere.com> - 2012-10-13 12:32 +0100
  Re: Checking for dlls in ctypes MRAB <python@mrabarnett.plus.com> - 2012-10-12 17:57 +0100
    Re: Checking for dlls in ctypes Wanderer <wanderer@dialup4less.com> - 2012-10-12 10:52 -0700
    Re: Checking for dlls in ctypes Wanderer <wanderer@dialup4less.com> - 2012-10-12 10:52 -0700
  Re: Checking for dlls in ctypes 88888 Dihedral <dihedral88888@googlemail.com> - 2012-10-13 06:40 -0700

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