Python import dll

python dll ctypes
pajm picture pajm · Mar 10, 2011 · Viewed 64.1k times · Source

How would I import a winDLL into python and be able to use all of its functions? It only needs doubles and strings.

Answer

David Heffernan picture David Heffernan · Mar 10, 2011

You've tagged the question ctypes and so it sounds like you already know the answer.

The ctypes tutorial is excellent. Once you've read and understood that you'll be able to do it easily.

For example:

>>> from ctypes import *
>>> windll.kernel32.GetModuleHandleW(0)
486539264

And an example from my own code:

lib = ctypes.WinDLL('mylibrary.dll')
#lib = ctypes.WinDLL('full/path/to/mylibrary.dll')
func = lib['myFunc']#my func is double myFunc(double);
func.restype = ctypes.c_double
value = func(ctypes.c_double(42.0))

Related questions

list exported functions from dll with ctypes

Is there any way to know which functions are exported from the dll through python foreign function library ctypes? And if possible to know details about the exported functions through ctypes. If yes, could someone provide a snippet of code?

Read More
Error loading DLL in python, not a valid win32 application

I am trying to load a DLL in python to call functions. import ctypes from ctypes import * dsusb = ctypes.WinDLL('c:\python27\dsusb.dll') I get the following error in my stack. C:\Python27>python test.py Traceback (most …

Read More
WindowsError: [Error 126] when loading a DLL with ctypes

This works fine on Windows 7 with Python 2.7: lib = ctypes.cdll.LoadLibrary('prov_means') provmeans = lib.provmeans The library prov_means.DLL is in my working directory. It exports a simple, stand-alone C function provmeans() with no dependencies. When I try …

Read More