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The documentation doesn't describe how to use the "external joystick id" that is referenced in the IDirectInputEffectDriver. I'm writing the driver to communicate with a force-feedback device I have created, and I need to be able to correlate to the HID device based on the passed-in joystick ID so that I can open it and send data to it. Any help is appreciated
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Hello,
for this you need to call the DINPUTD.H structure DIHIDFFINITINFO
The DIHIDFFINITINFO structure is used by DirectInput to provide information to a HID force-feedback driver about the device it is being asked to control.
https://learn.microsoft.com/en-us/windows/win32/api/dinputd/ns-dinputd-dihidffinitinfo
--If the reply is helpful, please Upvote and Accept as answer--
Fantastic. Not sure how I missed this. Thank you very much.
I have an additional question. Which registry key identifies that an HID device is force-feedback compatible? For example, applications can use DirectInput to enumerate devices based on capabilites (force-feedback being one of those capabilities). I assume DirectInput checks for a registry key that identifies a device as being force-feedback capable. To test, I've added the OEMForceFeedback key to a game controller in HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\MediaProperties\PrivateProperties\Joystick\OEM. The device isn't recognized as force-feedback though, but I don't know where else identifies this property of joysticks/HID game controllers. I've checked registry entries for existing force-feedback devices too and copied keys+values from them, but still this controller isn't recognized as a force-feedback device. How can I make this recognized as a force-feedback device?