关于BSTR的使用

有谁知道数据类型BSTR该怎么用吗？有谁能传给我BSTR的源代码？

 BSTR, known as basic string or binary string, is a pointer to a wide character string used by Automation data manipulation functions.

typedef OLECHAR FAR* BSTR;
 
BSTRs are wide, double-byte (Unicode) strings on 32-bit Windows platforms and narrow, single-byte strings on the Apple? PowerMac