What is the significance of declaring a method STDMETHODIMP?

Question

significance of declaring a method STDMETHODIMP....?!

Answer 1

This ensures that your calling convention is the one used by COM. When you are writing a COM server, you normally use STDMETHOD to declare methods exposed to COM and STDMETHODIMP to implement them.

E.g

*.idl

interface IWhatever
{
HRESULT Method(params);
};

*.h

class IWhateverImpl : ...
{
 ...
 STDMETHOD(Method)(params);
 ...
};

*.cpp

STDMETHODIMP IWhateverImpl::Method(params)
{
 ...
}

Goran.

Answer 2

This ensures that your calling convention is the one used by COM. When you are writing a COM server, you normally use STDMETHOD to declare methods exposed to COM and STDMETHODIMP to implement them.

E.g

 

*.idl



interface IWhatever

{

HRESULT Method(params);

};



*.h



class IWhateverImpl : ...

{

 ...

 STDMETHOD(Method)(params);

 ...

};



*.cpp



STDMETHODIMP IWhateverImpl::Method(params)

{

 ...

}

 

Goran.

Thanks ...