[C++-sig] Embending : Expose and Extract a dictionary object To/From C++

[Constant Dupuis]

I try with the sample given here
http://wiki.python.org/moin/boost.python/EmbeddingPython

With a C++ Class and this works, so I guess something "wrong" with the
c++ dict object ....



2009/9/3 Constant Dupuis <constant.dupuis at gmail.com>:
> nop, i got a Segmentation fault
>
> I forget to say that I'm on Mac, I don't knwo if this can change somethings.
>
>
> 2009/9/3 Mark Chandler <admin at lodle.net>:
>> Can you print iptc by it self?
>>
>>
>>
>> On 03/09/2009, at 3:41 PM, Constant Dupuis wrote:
>>
>>> Ok, thanks,
>>>
>>> Now I got a "Segmentation fault" error message when I try "print
>>> iptc['Headline']".
>>>
>>> Is the dict object directly exposable ? Or do I have to create a
>>> std::map base class ?
>>>
>>> Constant
>>>
>>> 2009/9/3 Mark Chandler <admin at lodle.net>:
>>>>
>>>> when you do the exec add the main_namespace twice
>>>>
>>>>> object ignored = exec("print('Headline')\n print(iptc['Headline'])\n",
>>>>> main_namespace,main_namespace);
>>>>
>>>>
>>>> On 03/09/2009, at 3:12 PM, Constant Dupuis wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I would like to expose a dictionary object instanciated in C++ to a
>>>>> Python code, which manipulate the dictoinary.
>>>>> And after extract the resulting modified dictionary back in C++.
>>>>>
>>>>> I try this :
>>>>>
>>>>> try {
>>>>>
>>>>>  Py_Initialize();
>>>>>
>>>>>       std::cout << "Hello, World!\n";
>>>>>
>>>>>       dict d;
>>>>>       d["Headline"] = "Titre";
>>>>>
>>>>>       object main_module = import("__main__");
>>>>>       object main_namespace = main_module.attr("__dict__");
>>>>>
>>>>>       main_namespace["iptc"] = ptr(&d);
>>>>>
>>>>>       object ignored = exec("print('Headline')\n"
>>>>>
>>>>>  "print(iptc['Headline'])\n",
>>>>>                                               main_namespace);
>>>>>
>>>>>
>>>>> } catch( error_already_set ) {
>>>>>  PyErr_Print();
>>>>> }
>>>>>
>>>>> And here is hte output :
>>>>>
>>>>> Hello, World!
>>>>> Headline
>>>>> Traceback (most recent call last):
>>>>>  File "<string>", line 2, in <module>
>>>>> TypeError: 'NoneType' object is unsubscriptable
>>>>>
>>>>> What did I missed ?
>>>>>
>>>>> Thanks en regards,
>>>>>
>>>>> Constant
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