I am using Python Ctypes to access some C library. One of the functions I connected to, returns const *double, which is actually an array of doubles. When I get the result in Python, how can I convert this array to a python list? The signature of the C function: Let’s assume that it returns an array that contains 0.13
Tag: ctypes
Pass a 2d numpy array to c using ctypes
What is the correct way to pass a numpy 2d – array to a c function using ctypes ? My current approach so far (leads to a segfault): C code : Python code: Answer This is probably a late answer, but I finally got it working. All credit goes to Sturla Molden at this link. The key is, note that
how to create empty c type array (or just one NULL value) in python?
I was wondering whether (and how) one can create empty c type arrays in python. The following code works fine if I want to initialize an array with zeros: If data is a list of None values however, I get an error message: is there a way to initialize and array with NONEs or NULLs? EDIT 1: the reason why
ctypes variable length structures
Ever since I read Dave Beazley’s post on binary I/O handling (http://dabeaz.blogspot.com/2009/08/python-binary-io-handling.html) I’ve wanted to create a Python library for a certain wire protocol. However, I can’t find the best solution for variable length structures. Here’s what I want to do: The class Points won’t work since num_points isn’t defined yet. I could redefine the _fields_ variable later once num_points
Python interfacing with C library – How to have a null c pointer
I have the following old c code. Now, I need to use Python to call old c function. I have the following code. May I know what is the Python equivalent for c[2] = 0;? Answer None and 0 both work:
How do I convert a Python list into a C array by using ctypes?
If I have the follow 2 sets of code, how do I glue them together? How can I call the c_function with a contiguous list of elements in x? I tried to cast x to a c_void_p, but that didn’t work. I also tried to use something like but this gets a syntax error. The C code clearly wants the