Re: Question about accessing global data from a line function

[sisyphus1]

Hi,

You can also access the string in $data from C with (untested):
SvPV_nolen(get_sv(main::data,0));
See 'perldoc perlapi' (or maybe it's in 'perldoc perlcall').

Cheers,
Rob

From: Ron Grunwald via inline
Sent: Wednesday, November 30, 2016 1:10 AM
To: Perf Tech ; inline@perl.org
Subject: Re: Question about accessing global data from a line function
Hi Jin,

I don’t think you can access perl variables this way because your C function 
needs some sort of reference to them. Change your code to,

$data = "this is a test";
test($data);


use Inline C => <<'END_OF_C_CODE';


void test(SV* data) {
printf("here: %s\n", SvPV(data, PL_na));
}


END_OF_C_CODE

Cheers,
Ron.


On 23 Nov 2016, at 1:29 pm, Perf Tech <perfte...@gmail.com> wrote:

Dear expert,

  I am trying to access perl global variable ($data in this case) from 
within a inline C function, but the "data" variable I used is not defined.
Any idea how to do it?

Thanks
Jin


$data = "this is a test";
test();

use Inline C => <<'END_OF_C_CODE';

void test() {
printf("here: %s\n", SvPV(data, PL_na));
}

END_OF_C_CODE