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Checking for dlls in ctypes

MRAB python at mrabarnett.plus.com
Fri Oct 12 12:57:02 EDT 2012 
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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