RtlInitUnicodeString与UNICODE_STRING的区别

请问各位大侠，RtlInitUnicodeString与UNICODE_STRING的区别在那里呢？

UNICODE_STRING是一个结构.当你声明一个UNICODE_STRING时它的成员未初始化.而RtlInitUnicodeString是一个函数用来初始化一个UNICODE_STRING.

UNICODE_STRING
The UNICODE_STRING structure is used to define Unicode strings.

typedef struct _UNICODE_STRING {
  USHORT  Length;
  USHORT  MaximumLength;
  PWSTR  Buffer;
} UNICODE_STRING *PUNICODE_STRING;
Members
Length
The length in bytes of the string stored in Buffer.
MaximumLength
The maximum length in bytes of Buffer.
Buffer
Pointer to a buffer used to contain a string of wide characters.
Headers
Defined in ntdef.h. Include wdm.h or ntddk.h.

Comments
The UNICODE_STRING structure is used to pass Unicode strings. Use RtlInitUnicodeString to initialize a UNICODE_STRING.

If the string is NULL-terminated, Length does not include the trailing NULL.

The MaximumLength is used to indicate the length of Buffer so that if the string is passed to a conversion routine such as RtlAnsiStringToUnicodeString the returned string does not exceed the buffer size.