Indeed, it does!

Can you explain what the difference is between each of the versions, and why this (confusing) redundancy exists?

Here they are for reference:

//... stlsoft::ref_ptr<IGraphBuilder> pGraph; stlsoft::ref_ptr<IMediaControl> pMediaControl;//...1. pMediaControl.set(interface_cast_addref<IMediaControl*>(pGraph.get()), false); // this is OK 2.pMediaControl.set(interface_cast_addref<IMediaControl*>(pGraph), false); // this blows up. 3.pMediaControl = interface_cast<IMediaControl>(pGraph); // this is OK

Thanks,
Adi

Matthew Wilson wrote:

As far as I can remember, the adjustment to interface_cast_addref<> to take ref_ptr<X> arguments has _not_ been done, so the code as you've written it will not work.

However, the following (cleaner, nicer, more transparent) version should:

   //...
   stlsoft::ref_ptr<IGraphBuilder> pGraph;
   stlsoft::ref_ptr<IMediaControl> pMediaControl;
   //...   if(SUCCEEDED(co_create_instance(CLSID_FilterGraph, pGraph)))    {       pMediaControl = interface_cast<IMediaControl>(pGraph);   //...

:-)

Matt