HidD_GetManufacturerString的返回字符串最大是多少啊？

  BOOLEAN
  HidD_GetManufacturerString(
    IN HANDLE  HidDeviceObject,
    OUT PVOID  Buffer,
    IN ULONG  BufferLength
    );
Parameters
HidDeviceObject
Specifies an open handle to a top-level collection.
Buffer
Pointer to a caller-allocated buffer that the routine uses to return the collection's manufacturer string. The routine returns a NULL-terminated wide character string in a human-readable format.
BufferLength
Specifies the length, in bytes, of a caller-allocated buffer provided at Buffer. If the buffer is not large enough to return the entire NULL-terminated embedded string, the routine returns nothing in the buffer.
Return Value
HidD_HidD_GetManufacturerString returns TRUE if it returns the entire NULL-terminated embedded string. Otherwise, the routine returns FALSE.

Headers
Declared in hidsdi.h. Include hidsdi.h.

我想用到512个字节不知道可以达到否，请指点下？