Input: Indicates, for which parameter the description is provided; parameters start at 1. If nParam is 0, the description itself is supposed to be provided in pDesc; in this case, pName does not have any meaning.
Input: 指定该说明应提供哪些参数，参数从 1 开始。如果 nParam 为 0，则该说明自身要在 pDesc 中提供，此情况下 pName 无意义。