The PnP Configuration Manager API is your friend here:
CM_Locate_DevNode opens a device handle given a device ID;
CM_Get_Parent finds the parent device;
CM_Get_Device_ID_Size and CM_Get_Device_ID take the device handle and return the device ID.
I have two USB device IDs, e.g. USB\VID_E4F1&PID_0661\00000115FA9CE7750000000000000000 and USB\VID_E4F1&PID_0661&MI_00\7&B5A5DDF&0&0000
How to verify device #2 is a direct child of device #1 (physically they’re different parts of the same USB composite device)?
In real-life scenarios it will be many of them connected to the same USB controller. Moreover, it's possible they'll be of the same maker and model. That's why I cant verify the VID, PID, and use Win32_USBControllerDevice WMI query to verify they're plugged into the same USB controller - I need to somehow verify the parent-child relation, not just the fact they're plugged into the same controller.
If it matters, I only need to support Windows 8+.
The PnP Configuration Manager API is your friend here:
CM_Locate_DevNode opens a device handle given a device ID;
CM_Get_Parent finds the parent device;
CM_Get_Device_ID_Size and CM_Get_Device_ID take the device handle and return the device ID.