CODEWITHSUNDEEP
pythondllimportloadlibrary
Thalia
Thalia

Reputation: 14615

python: unable to specify relative path for dll import

I am trying to load a dll in python, and can only do so if I enter the absolute path. I would like to use a relative path, or environment variables. The only thing that works is if I specify the exact path (C:...) I even tried to get the dll to build directly in the same folder as the py file, it still didn't work.
What I have:

MY_DLL = r'c:\full_path\output\Win32\Debug\my.dll'
#MY_DLL = r'my.dll'   #this doesn't work but it is what I want
#MY_DLL = r'$(env_var)\dir\output\$(Platform)\$(Configuration)\my.dll'   #this doesn't work either but would be good too

Help ?

Upvotes: 1

Views: 764

Answers (1)

mgilson
mgilson

Reputation: 310187

I don't know about cdll on windows or really much about ctypes in general, however, you can manipulate paths quite easily using os.path:

import os.path
p1="path.dll"
print (os.path.abspath(p1))
p2="${env_var}/path.dll"  #Make sure you set env_var in the calling environment...Otherwise it won't be expanded...
print (os.path.expandvars(p2))

Upvotes: 1

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