Permission denied on dl.open() with ipython but not with python

Question

My initial goal is to open a dll file on Cygwin using ctypes. However I found some issues with it. I dug up to sys.dl which returns an unk

Answer 1

• Perhaps Python executable and IPython kernel use different manifest files which define loading policy?

• Try appending the DLL path to sys.path in both cases.

• Check admin rights (UAC) in both cases.

• Use dependency walker to figure out dependencies of this DLL. Maybe the problem comes from dependencies?

• Possibly your machine has multiple copies of this DLL?

• Finally you can use Process Explorer to see the list of DLLs loaded in both cases and see any differences.

I'm working on a very similar issue:

ipython notebook & script difference - loading DLLs