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Can anyone explain the difference between the types mentioned above and some sample usage to clearly explain the difference between the two?
Any help would be highly appreciated! Note: this question is a spin-off from this other question
BSTRis the string data type used with COM._bstr_tis a wrapper class that works like a smart pointer, so it will free the allocated memory when the variable is destroyed or goes out of scope._bstr_talso has reference counting, which increases every time you pass the_bstr_tvariable by value (avoiding unnecessary copy) and decrement when it is no longer used. Whenever all references are destroyed, the allocated memory for the string is freed.An alternative to
BSTRis theCComBSTR. It also manages the memory for theBSTR, but has no reference counting.