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Get the Index descriptor for the current field (if any).

If IdxDesc is null, this function can be used to check if an index exists. It returns DBIERR_NOSUCHINDEX if no index exists. This example uses the following input:                fDbiGetIndexForField(hPXCur, 1, &IdxDesc);

DBIResult fDbiGetIndexForField(hDBICur hTmpCur, INT16 Field, pIDXDesc IdxDesc)

{

   DBIResult   rslt;

   rslt = DbiGetIndexForField(hTmpCur, Field, FALSE, IdxDesc);

   if (rslt == DBIERR_NOSUCHINDEX)

      return rslt;

   else

      Chk(rslt);

   return rslt;

}