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unicode wchar_t is 16 bit char variable in COM/OLE. This is also known as wide character. Wide character array/string can give Multilanguage language support. BSTR is a kind of array of wide chars. The difference is BSTR holds the length of the string in the header and the content follows the header. The first 16bit/2 byte holds the length of the string and rest of the bytes contains the wide chars. All the out-of-process COM/DCOM uses this BSTR because when the string has to be transported through RPC the length indicates how many bytes should follow after header of BSTR.

BSTR memory layout
Header 16 bit(length) Body (Length * sizeof(wchar_t)

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