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`BSTR` stands for "Basic String"


Refers to 0-terminated strings as popularized by C, as well as the header-files `string.h` and `cstring`.



A cstring is more like a visual basic string or a bstr

from question  

Is a CString always null-terminated?

About allocsysstring it creates a copy in bstr they re more complex than cstring they re null-terminated too but they also have length at negative offset

from question  

CPP Windows string conversions confusion CStringA and LPCWSTR

If the bstr doesn t have nul s embedded inside you can simply pass it to a cstring constructor that will make a deep-copy of it and you can locally work with your cstring;modifications to that cstring won t be visible on the original bstr

from question  

Shall we treat BSTR type in COM as value or reference?

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