Embedded python adding variables linking to C++-Variables / callbacks

[iwl]

Hello,

I would like to add Variables to my embedded python which represents
variables from my
C++-Programm.
I found C-Api-funcs for adding my C-Funcs to python but none to add
variables.
I would like some C-Function is called when the added Python-varible is
set (LValue) and
some other when it is read (RValue). Can I do this.
May be I have to do this in python and call the C-Funcs from a python
callback.

May be somebody can give short hints what to look for.

[gagsl-py@yahoo.com.ar]

Re: Embedded python adding variables linking to C++-Variables / callbacks

iwl ha escrito:

I would like to add Variables to my embedded python which represents
variables from my
C++-Programm.
I found C-Api-funcs for adding my C-Funcs to python but none to add
variables.
I would like some C-Function is called when the added Python-varible is
set (LValue) and
some other when it is read (RValue). Can I do this.
May be I have to do this in python and call the C-Funcs from a python
callback.

Write some C functions -callable from Python- which will be used to get
and set the variable value.

>From inside Python, declare a property with getter and setter which

will call your C functions.
This works fine for object attributes. If you want to trap references
to local or global "variables" , I think you could provide customized
dictionaries for locals and globals, but I'm not sure if it works
really.

--
Gabriel Genellina

[iwl]

Re: Embedded python adding variables linking to C++-Variables / callbacks


gagsl-py@yahoo.com.ar schrieb:

>
Write some C functions -callable from Python- which will be used to get
and set the variable value.

From inside Python, declare a property with getter and setter which

will call your C functions.
This works fine for object attributes. If you want to trap references
to local or global "variables" , I think you could provide customized
dictionaries for locals and globals, but I'm not sure if it works
really.
>

Thank you I will try this.
What I found out up to now is to create a class inherited from an
fitting type
and overwrite the __setitem__ and __getitem__ method but haven't test
this
yet, something like that:

class test(int):
__setitem(self, value)__: C-Set-Func(value)
__getitem(self) __: return C-Get-Func()

x=test()
x= -C-Set-Func called
y=x -C-Get-Func called

something seems not yet correct

[gagsl-py@yahoo.com.ar]

Re: Embedded python adding variables linking to C++-Variables / callbacks

On 7 dic, 11:33, "iwl" <Ingo.W...@gmx. dewrote:

What I found out up to now is to create a class inherited from an
fitting type
and overwrite the __setitem__ and __getitem__ method but haven't test
this
yet, something like that:
>
class test(int):
__setitem(self, value)__: C-Set-Func(value)
__getitem(self) __: return C-Get-Func()
>
x=test()
x= -C-Set-Func called
y=x -C-Get-Func called

Python doesn't work that way: http://effbot.org/zone/python-objects.htm