'perldoc perlapi' says
POPp

Pops a string off the stack. Deprecated. New code should provide a STRLEN n_a and use POPpx.

update: so something like 
STRLEN n_a;
char* stringy;
stringy = POPpx;

[download]
Now n_a contains the length of stringy , and you can do whatever from there.

MJD says "you can't just make shit up and expect the computer to know what you mean, retardo!"
I run a Win32 PPM repository for perl 5.6.x and 5.8.x -- I take requests (README).
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In reply to Re: size of scalar returned by POPp in perlEmbed by PodMaster
in thread size of scalar returned by POPp in perlEmbed by jithoosin

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