Length of the following string, including closing zero byte. If the length including closing zero byte equals an odd value a second zero byte is added to the string so that an even value is achieved. Therefore, Len is calculated using ((StrLen+2) & ~1).
下列字符串的长度，包括结尾的 0 字节。如果该长度包括结尾的 0 字节给出一个奇数值，则给该字符串增加一个第二个 0 字节，以便取得一个偶数值。这样，Len 使用((StrLen+2) & ~1)来计算。