Windows-rs: Requesting an example of how to implement a COM interface

[tecywiz121]

I have a fairly simple C++ program that turns on a blink(1) based on a capture device's mute state.

I'd love to port that code to Rust, if possible, but I don't know how to implement the IMMNotificationClient or IAudioEndpointVolumeCallback interfaces.

I noticed that there is the implement macro, but the documentation seems a bit sparse. If there is an example of how to do this, could you point me toward it, and if not, I humbly request one!

[kennykerr]

The implement macro currently only supports WinRT interfaces, but I am working on adding support for COM interfaces like IAudioEndpointVolumeCallback and should be coming soon.

[peacememories]

Thanks for working on this, I need to be able to implement DirectShow filters 😅

[agausmann]

I'm also affected by this, in the meantime, is there some way to implement interfaces by hand?

[rylev]

Implementing COM interfaces from scratch is non-trivial but very much possible. It does take quite a bit of knowledge of how COM works under the hood though. You can have a look at https://github.com/microsoft/com-rs (specifically the code gen aspects of that crate) for some clues.

[kennykerr]

Duplicate of #81 - working on it.

[knopp]

I'm also affected by this, in the meantime, is there some way to implement interfaces by hand?

Here's an example of implementing drag&drop com interfaces by hand. It is doable but less than ideal. A macro would be very welcome indeed :)

[kennykerr]

That's all I am working on at the moment. 😉