[C++-sig] Accessing Class Member Function from Python

[Nagaraju]

Hi Nat and All,

I have created a TestProject.pyd file and imported it into Python as
import TestProject
planet = TestProject.MyClass()
planet.add(1,1)

When I execute the last statement, Python is giving following error:
Traceback (most recent call last):
  File "<pyshell#11>", line 1, in <module>
    planet.add(int(1),int(1))
ArgumentError: Python argument types in
    MyClass.add(MyClass, int, int)
did not match C++ signature:
    add(int, int)

Python version is: 2.7
Can anybody tell me how to resolve this issue?

Thanks in advance.

Regards,
Raju.

On Wed, Jun 6, 2012 at 7:08 PM, Nagaraju <srirangamnagaraju at gmail.com>wrote:

> Hi Nat,
>
> Thank you very much for the reply.
> I tried making the target as ".pyd" and I am able to import it in Python
> script.
>
> Thanks again.
>
> Regards,
> Raju.
>  On Wed, Jun 6, 2012 at 6:57 PM, Nat Linden <nat at lindenlab.com> wrote:
>
>> On Wed, Jun 6, 2012 at 6:57 AM, Nagaraju <srirangamnagaraju at gmail.com>
>> wrote:
>>
>> > Thank you very much for your reply. I am sorry if I did not explain
>> > something clearly.
>> >
>> > I am doing as below after implementing the MyClass in the same file:
>> >
>> > BOOST_PYTHON_MODULE(hello){
>> > ...
>> > }
>> >
>> > I am using CDLL from ctypes to load this Test.DLL. Say
>> > planet = CDLL("Test.DLL").
>> >
>> > Now I want to create an object of MyClass and call add function. How
>> can I
>> > do this?
>>
>> I think you're mixing two different tactics here.
>>
>> You can use ctypes to load a plain DLL that publishes extern "C"
>> functions, and call those functions. But I don't believe it supports
>> the notion of a Python class defined in that DLL.
>>
>> Or you can use Boost.Python to prepare a special DLL that Python will
>> recognize as an extension module. Such modules can be loaded with
>> 'import'. In this case you don't use ctypes because the module
>> contents describe themselves for the Python runtime to know how to use
>> them directly, classes and methods and functions and data.
>> Boost.Python is a succinct way to provide such a description.
>>
>> But it's my belief that a DLL containing the description compiled from
>> BOOST_PYTHON_MODULE(hello) must be named "hello.pyd" for the Python
>> interpreter to successfully import it.
>>
>> Once you're able to import hello, you should be able to instantiate
>> hello.MyClass() and proceed from there.
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>
>
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