tp_getattrfunc, access members that are a list

[Torsten Mohr]

Hi,

in the documentation and the examples that describe how to
make the members of a new type accessible it says that
i need to use the getattrfunc and setattrfunc if i want
to access members that are an array.

typedef struct {
PyObject_HEAD
unsigned char d[8];
} pmod_obj;

Sadly i did not find any example on how to do this.

Can anybody describe me how i can access the array d[8]
as a list? I'd like to get AND set values in there.


Thanks for any hints,
Torsten.

[Thomas Heller]

Re: tp_getattrfunc, access members that are a list

Torsten Mohr <tmohr@s.netic. de> writes:
[color=blue]
> Hi,
>
> in the documentation and the examples that describe how to
> make the members of a new type accessible it says that
> i need to use the getattrfunc and setattrfunc if i want
> to access members that are an array.
>
> typedef struct {
> PyObject_HEAD
> unsigned char d[8];
> } pmod_obj;
>
> Sadly i did not find any example on how to do this.
>
> Can anybody describe me how i can access the array d[8]
> as a list? I'd like to get AND set values in there.[/color]

I don't think you can expose them as a list, but you should look into
structmember.h, and it's PyMemberDef to expose the items separately.

Thomas

[Torsten Mohr]

Re: tp_getattrfunc, access members that are a list

>> Can anybody describe me how i can access the array d[8][color=blue][color=green]
>> as a list? I'd like to get AND set values in there.[/color]
>
> I don't think you can expose them as a list, but you should look into
> structmember.h, and it's PyMemberDef to expose the items separately.[/color]

Hi,

i've looked into structmember.h, but nothing (like e.g. a flag)
can mark that member as an array.
Also, i can't just export every single array member, as i need
to access them indexed, e.g. in a for() for clearing, for
setting calculated values, ...

In the documentation i read that accessing arrays should be done
by getattr/setattr functions. This must be possible somehow...


Best regards,
Torsten.

[Thomas Heller]

Re: tp_getattrfunc, access members that are a list

Torsten Mohr <tmohr@s.netic. de> writes:
[color=blue][color=green][color=darkred]
>>> Can anybody describe me how i can access the array d[8]
>>> as a list? I'd like to get AND set values in there.[/color]
>>
>> I don't think you can expose them as a list, but you should look into
>> structmember.h, and it's PyMemberDef to expose the items separately.[/color]
>
> Hi,
>
> i've looked into structmember.h, but nothing (like e.g. a flag)
> can mark that member as an array.
> Also, i can't just export every single array member, as i need
> to access them indexed, e.g. in a for() for clearing, for
> setting calculated values, ...
>
> In the documentation i read that accessing arrays should be done
> by getattr/setattr functions. This must be possible somehow...[/color]

Ok, structmember.h was the wrong hint - it is used to expose
heterogenous fields.

For sequence like behaviour, you must implement PySequenceMetho ds:
sq_length, sq_item, sq_add_item for example.

Thomas