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From: Murrgon on 10 Jun 2010 11:15
I have a simple C++ library (from a dll) I am attempting to make accessible
through bindings to python. I used Py++ to generate some boost code for the
library that I compiled into a pyd. I can import the pyd no problem into
python, but I can't seem to call the functions.

struct MM_Api
{
void* pData;
};

int declspec(dllimport) MM_Initialize( MM_Api* pApi );

I made a PyMM.pyd that has this in it.

import PyMM
api = PyMM.MM_Api
ret = PyMM.MM_Initialize(api)

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
Boost.Python.ArgumentError: Python argument types in
PyMM.MM_Initialize(Boost.Python.class)
did not match C++ signature:
MM_Initialize(struct MM_Api * pApi)

The docs for Py++ leave a lot guess work up to the user, so I don't know if I
forgot a step, or messed something up. Is there some glue I need to
write/generate that will translate an instance of PyMM.MM_Api to the C++
version of MM_Api, and if so, is this python glue, or C/C++ glue?

Thank you
Murrgon
From: Thomas Jollans on 10 Jun 2010 11:50
On 06/10/2010 05:15 PM, Murrgon wrote:
> I have a simple C++ library (from a dll) I am attempting to make
> accessible through bindings to python. I used Py++ to generate some
> boost code for the library that I compiled into a pyd. I can import the
> pyd no problem into python, but I can't seem to call the functions.
>
> struct MM_Api
> {
> void* pData;
> };
>
> int declspec(dllimport) MM_Initialize( MM_Api* pApi );
>
> I made a PyMM.pyd that has this in it.
>
> import PyMM
> api = PyMM.MM_Api
> ret = PyMM.MM_Initialize(api)
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> Boost.Python.ArgumentError: Python argument types in
> PyMM.MM_Initialize(Boost.Python.class)
> did not match C++ signature:
> MM_Initialize(struct MM_Api * pApi)

Just guessing here: maybe you meant to type

import PyMM
api = PyMM.MM_Api()
ret = PyMM.MM_Initialize(api)

(initializing the MM_Api and passing the object instead of the class)

>
> The docs for Py++ leave a lot guess work up to the user, so I don't know
> if I forgot a step, or messed something up. Is there some glue I need
> to write/generate that will translate an instance of PyMM.MM_Api to the
> C++ version of MM_Api, and if so, is this python glue, or C/C++ glue?
>
> Thank you
> Murrgon

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