NWisxdigit
Returns a nonzero value if the given character is a hexadecimal digit
#include <nwlocale.h>
nint N_API NWisxdigit (
nuint ch);
uses netwin32 Function NWisxdigit (ch : nint ) : nint;
DBCS characters passed to NWisxdigit should be byte-swapped to Intel lo-hi order.
Currently all double-byte characters return zero.