[ggomeze]

I am newbie in Python, and though i´ve been reading all documentation i´ve been able to, i haven´t found any issue concerning with dinamically Symbian C++ libraries loading.

I am not sure if i must use init functions and Py_InitModule () as C.

Have anyone done a functional extension of Python with these kind of libraries?.

Any help will be appreciated.

Thanks in advance

[jplauril]

I don't quite understand what you mean by loading Symbian C++ libraries dynamically. Can you be more specific?

[ggomeze]

Just imagine i extend Python using a Symbian DLL, for instance, a polymorphic DLL.How can i load this library?, must my Symbian DLL implement a specific interface?. Hope this clarify my question. Thanks!

[jplauril]

Check out the 1.1.6 release. A minimal example extension is included.

[ggomeze]

Do you mean 1.6.1 (September 2000)???.

Oldest python version available is 1.5.2, isn´t it??

Thanks for your response!

[jplauril]

No, I'm referring to Python for Series 60 release 1.1.6 which came out this summer. It's built on Python interpreter version 2.2.2.

[korakotc]

Jplauril, would it be possible to have something like ctypes on symbian as well?
Ctypes make calling native dll much easier, no need to create an extension for interface.

[jplauril]

Unfortunately using ctypes would be quite problematic. All interesting Symbian API's are C++ and ctypes is built with C in mind. To create C++ objects to pass as parameters you would need to parse the headers with a real C++ compiler and this would be much more complicated than for C. An additional inconvenience is that Symbian DLL's don't include function names, just ordinals, so you would have to pregenerate the naming information for the SDK libraries beforehand.

[otsov]

Originally Posted by ggomeze

Just imagine i extend Python using a Symbian DLL, for instance, a polymorphic DLL.How can i load this library?, must my Symbian DLL implement a specific interface?. Hope this clarify my question. Thanks!

Have a look at "RLibrary" in your SDK documentation if you are dynamically loading DLLs.

[ggomeze]

I know how to load a Symbian DLL from Symbian. My doubt was related to load those libraries from Python. I have many modules (Symbian DLL Libraries) made on Symbian and i would like to reuse them from Python.

Thanks anyway for your response

[simo.salminen]

Originally Posted by ggomeze

I know how to load a Symbian DLL from Symbian. My doubt was related to load those libraries from Python. I have many modules (Symbian DLL Libraries) made on Symbian and i would like to reuse them from Python.

Thanks anyway for your response

As said, there is no direct way to load C++ libraries from Python. You must implement a C++ wrapper. The wrapper calls your C++ library.

So, the call sequence will be following:
Python->Python C++ wrapper->Your C++ Library.

For instructions how to implement the wrapper, please see API doc, appendix C.

[ggomeze]

Ok thank you!, that´s what i needed!.

Let me have a look and find out if it resolves my doubts, but it sounds very well.

[simo.salminen]

This previous post that shows exactly how to implement a wrapper: http://discussion.forum.nokia.com/fo...ad.php?t=65720

[terohiit]

Originally Posted by jplauril

Unfortunately using ctypes would be quite problematic. All interesting Symbian API's are C++ and ctypes is built with C in mind.

Now that Open C is available I think it'd make some sense to have ctypes for PyS60. Presumably there will also be other C libraries built on top of Open C. I've started looking into porting ctypes (and libffi). Here is what I have so far: http://www.hiit.fi/files/fi/da/ctypes/web/

[cyke64]

Originally Posted by terohiit

Now that Open C is available I think it'd make some sense to have ctypes for PyS60. Presumably there will also be other C libraries built on top of Open C. I've started looking into porting ctypes (and libffi). Here is what I have so far: http://www.hiit.fi/files/fi/da/ctypes/web/

Hello Tero

It's very great

I packed the missing ctypes (pure python) and put it on my site.
Now I can use the testing code

import ctypes
import _ctypes

h = _ctypes.dlopen("libcrypto.dll")
try:
    print type(h)
    sha = _ctypes.dlsym(h, "1491")
    init = _ctypes.dlsym(h, "1493")
    update = _ctypes.dlsym(h, "1495")
    final = _ctypes.dlsym(h, "1492")
    print [sha, init, update, final]

    data = "digestible message"
    result = ctypes.create_string_buffer(20)
    _ctypes.call_function(sha, (data, len(data), result))
    print ctypes.sizeof(result), repr(result.raw)
finally:
    _ctypes.dlclose(h)

"""
To do the same with the Python "sha" library:

import sha
result = sha.new("digestible message").digest()
print len(result), repr(result)

"""

Look at my site and download the missing ctypes python part !

links :
ctypes 1.0.2 3rd (without _ctypes.pyd !)

Cyke64