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based on an earlier version of the Wolfram Language.
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MathLink C Function

MLReleaseUTF16Symbol()

void MLReleaseUTF16Symbol(MLINK link, const unsigned short *s, int len)
disowns memory allocated by MLGetUTF16Symbol() to store the UTF-16 encoded character string s corresponding to the name of a symbol.
  • MLReleaseUTF16Symbol() is declared in the MathLink header file mathlink.h.
#include "mathlink.h"

/* read a UTF-16 encoded symbol from a link and then release the memory to MathLink for deallocation */

void f(MLINK lp)
{
    const unsigned short *symbol;
    int number_of_codes;
    int number_of_characters;

    if(! MLGetUTF16String(lp, &symbol, &number_of_codes, &number_of_characters))
        { /* unable to read the UTF-16 encoded symbol from lp */ }

    /* ... */

    MLReleaseUTF16Symbol(lp, symbol, number_of_codes);
}