问题
What is the string terminator sequence for a UTF-16 string?
EDIT:
Let me rephrase the question in an attempt to clarify. How's does the call to wcslen() work?
回答1:
Unicode does not define string terminators. Your environment or language does. For instance, C strings use 0x0 as a string terminator, as well as in .NET strings where a separate value in the String class is used to store the length of the string.
To answer your second question, wcslen looks for a terminating L'\0' character. Which as I read it, is any length of 0x00 bytes, depending on the compiler, but will likely be the two-byte sequence 0x00 0x00 if you're using UTF-16 (encoding U+0000, 'NUL')
回答2:
7.24.4.6.1 The wcslen function (from the Standard)
...
[#3] The wcslen function returns the number of wide characters that precede the terminating null wide character.
And the null wide character is L'\0'
回答3:
There isn't any. String terminators are not part of an encoding.
For example if you had the string ab it would be encoded in UTF-16 with the following sequence of bytes: 61 00 62 00. And if you had 大家 you would get 27-59-B6-5B. So as you can see no predetermined terminator sequence.
来源：https://stackoverflow.com/questions/5923948/utf-16-string-terminator