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How to get HID Report Descriptor using Windows API

Xiaofan_ChenXiaofan_Chen Member - All Emails Posts: 208

We are having some discussion in libusb-devel mailing list and github
hidapi project here.
https://github.com/libusb/hidapi/issues/249

Just wondering if the experts here have any other ideas. Thanks.

Best regards,
Xiaofan

On Sat, Jun 19, 2021 at 12:14 PM Tim Roberts wrote:
>

On 6/18/21 6:56 PM, Xiaofan Chen wrote:

Switch to another question. Hopefully you can shed some light on this as well. Thanks.
MacOS and Linux provide APIs for reading the HID Report descriptor of an HID device.
Therefore we can get the unmodified HID Report Descriptor on these operating systems.
Unfortunately the Windows HID subsystem doesn't provide such an API.

>

Yes. This is a huge irritation to me. I have done two projects recently where I needed to
imitate another device. If I could have grabbed the original report descriptor, this task
would have been way easier. In both cases, I ended up hard-coding the report descriptor,
which is distasteful.

>

What will be the good approach to reconstruct the HID report descriptor?

>

I spent some time with this, and I don't think it is possible. There's just not enough information
in the "parsed descriptors" to do that.

>

MAYBE (I haven't proven this to myself) you could use the same hub backdoor
that "usbview" uses, and fetch the report descriptor that way.

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