[Pyrex] passing method's args to extern func

[Bartosz SKOWRON]

On Wed, Jun 10, 2009 at 7:19 AM, Stefan Behnel<stefan_ml at behnel.de> wrote:

>> /home/xsx/__usrsrc__/pypcap/pcap.pyx:235:18: Cannot convert Python
>> object to 'pcap_pkthdr *'
> Maybe you could add some info about what kind of type 'pcap_pkthdr' is?
> Most likely, you will have to convert the data manually in some way.

Propably - yes. This is a struct:
struct pcap_pkthdr {
	struct timeval ts;	/* time stamp */
	bpf_u_int32 caplen;	/* length of portion present */
	bpf_u_int32 len;	/* length this packet (off wire) */
};

I tried to define it as ctypedef, but..hmm maybe i should cast something later?

> You can cast the object to <char*> first to let Pyrex do the conversion,
> and then re-cast that to <unsigned char*> to make the C compiler happy, i.e.
>
>        cdef unsigned char* c_val
>        c_val = <unsigned char*><char*>some_python_byte_string
>
> Note that this will not work with unicode strings, just plain byte strings.

There will be not a problem with unicode. It should works as you shown. Thanks!