If the function returns a 4 byte pointer then you should be able to do this:

    $str = unpack "p", some_func();
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If the function returns a pointer to a, known length, packed structure you can do this (where 32 is used as an example):

    $struct = unpack "P32", some_func();
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You will then probably need to unpack the structure to get at the members.

Referring to the particular XS API or source should tell you what is being returned.

--
John.