IUnknown and ComPtr

Question

(I'm very new to COM, so this may make no sense, but...)

I've implemented a custom font loader, and the interfaces are IUnknown.  I'm wondering if I can use a ComPtr to manage the reference counts for IUknown, or do I need to manually manage AddRef & Release for these objects?  E.g., can I define something like: ComPtr<IDWriteFontFile> currentFile, and let the ComPtr automatically handle AddRef & Release, rather than managing those calls manually?

Thanks.

Answer 1

I think you can. I myself use ComPtr<IInspectable> for WinRT objects, to correctly handle reference counts, and it works well.

Answer 2

Thanks!  I'll probably throw together a test at some point to confirm, but it sounds like it should work.