Re: Re: Passing a very large string by reference to a c library

Thks,

This is what I've been looking at. The example doesn't use references, though example 6 does. I can try to meld both together so that I can call:

find_index($key, \$data);

I guess a lot depends on how SvPV works. If it copies the data then I need another method.

dino

Comment on Re: Re: Passing a very large string by reference to a c library

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Re: Re: Re: Passing a very large string by reference to a c library by dino (Sexton) on Jul 12, 2001 at 18:37 UTC
I've got it to work with: unsigned long find_index (key, data) unsigned long key SV * data INIT: STRLEN datalen; char * s; if ((!SvROK(data)) \|\| (SvTYPE(SvRV(data)) != SVt_PV)) { XSRETURN_UNDEF; } s = SvPV(SvRV(data), datalen); CODE: RETVAL = find_index (key, s, datalen); OUTPUT: RETVAL I'm still not sure if SvPV copies its internal data somewhere or just returns a pointer to it. Comments please dino	[reply]
Re: Re: Re: Re: Passing a very large string by reference to a c library by dino (Sexton) on Jul 12, 2001 at 20:03 UTC
And finally, from the perlapi manpage: SvPV Returns a pointer to the string in the SV, or a stringified form of the SV if the SV does not con- tain a string. Handles 'get' magic. char* SvPV(SV* sv, STRLEN len) so that should do it dino	[reply]


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