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I'm trying to create a wrapper of my own for FLAC, so that I can use FLAC in my own Python code.
I tried using ctypes first, but it showed a really weird interface to the library, e.g. all the init functions for FLAC streams and files became one function with no real information on how to initialize it. Especially since it wants a reference to a stream decoder, but Python has no way to store pointers ( BZZZT! ), and thus I can't store the pointer to the stream decoder. It doesn't help that the different init functions have a different number of arguments and some argument types differ. It also has a lot of enumerations and structures, and I don't know how to get these into my code.
I've been looking into Pyrex, but I kinda ran into the same problem with pointers, but I think I solved it, sort-of. The file isn't small either, and it's not even complete.
So I'm looking for alternatives, or guides that would help me understand the aforementioned ways better. It would really help if I could get a recommendation and/or help.
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To wrap this manually, we need to do the following. First, write a Python-callable function that takes in a string and returns a string. Second, register this function within a module's symbol table (all Python functions live in a module, even if they're actually C functions!)
So first, we created a class that we wanted to wrap named 'Wrapped. ' Then, we created a decorator function and passed the wrapped class as an argument. After that, we created a wrapper class inside the decorator function. Then, we defined the init method inside it, which initializes its object when called.
In order to take advantage of the strength of both languages, developers use Python bindings which allows them to call C/C++ libraries from python.
Python has no way to store pointers, and thus I can't store the pointer to the stream decoder
ctypes has pointers, and ctypes can be used to wrap existing C libraries. Just a tip, you will need to wrap/rewrite all relavent C structures into ctypes.Structure. Take look at examples: code.google.com/p/pyxlib-ctypes and code.google.com/p/pycairo-ctypes. More info how to map function/procedure and its argtypes and restype at http://docs.python.org/library/ctypes.html
I've been looking into Pyrex, but I kinda ran into the same problem with pointers, but I think I solved it, sort-of. The file isn't small either, and it's not even complete.
cython may be what you need if you want clean syntax. www.cython.org
So I'm looking for alternatives, or guides that would help me understand the aforementioned ways better. It would really help if I could get a recommendation and/or help.
swig on other hand can always be used but it is more complicated if you are not used to it. www.swig.org
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Did you have a look at http://www.swig.org/:
SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages.
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