是否可以在C ++中覆盖此虚拟方法？

Question

In this program I'm trying to read data from a serial port but the data being read form the port is not in a format I like (comes out in large chunks). So I want to override how ReadBytes works.

BSTR buffer_bstr;
hr = pCom->ReadBytes( &buffer_bstr );

So ReadBytes is found in a library header called AComport.h made by the company ActiveXperts. When I go to the declaration of ReadBytes it is this

    virtual /* [helpstring][id] */ HRESULT STDMETHODCALLTYPE ReadBytes( 
        /* [retval][out] */ BSTR *__MIDL__IComPort0001) = 0;

What is this saying? I was looking for an implementation of ReadBytes so that I could change things around but all I see is this. What does it mean?

Answer 1

That's not a "real" C++ function, but it's a member function on a COM object that is presented as a C++ wrapper. Unless you implement an object that implements the same COM interface, you can't easily override or overload this function.