how to get vendor id and product id of a plugged usb device on windows

Question

I am using Qt on windows platform.

i want to get and display vendor id and product id of a plugged usb device from my local system.

Below is my full source c

Answer 1

You are enumerating the device "interface". Interfaces do not have a VID or PID - device instances do. I am not sure whether you are enumerating the interfaces to narrow down the devices you are interested in, for because it's an error.

If you just enumerate the device instances, then you can call SetupDiGetDeviceProperty with DEVPKEY_Device_HardwareIds and then grep the resulting hardware id for the VID and PID.

If you are using the device interfaces on purpose, then you need to call SetupDiGetDeviceInterfaceDetail once with a NULL PSP_DEVICE_INTERFACE_DETAIL parameter and a valid requiredSize pointer to get the required size of memory to allocate, allocate that memory and then call the function again. In that call, the last parameter is a SP_DEVINFO_DATA structure, which once retrieved, you can use in the call to SetupDiGetDeviceProperty as I mentioned above.