Passing a string from C # to cpp using COM

Question

I have a C # COM server that is consumed by the cpp client.

One of the C # methods returns a string.

In cpp, the returned string is represented in Unicode (UTF-16), at least according to the kind of memory.

• Is this always the case with COM strings?
• Is there a way to use UTF-8 instead?
• I saw some code where strings were passed between cpp and C # as arrays of bytes. Is there any use in this?

Answer 1

• Yes. The standard COM string type is BSTR. This is a Unicode string encoded in UTF16, just like the native Windows string type.
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Answer 2

• .
• . [return: MarshalAs(UnmanagedType.LPStr)] #, ANSI Unicode.
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