IOCTL_INTERNAL_USBFN_GET_CLASS_INFO IOCTL (usbfnioctl.h)
The class driver sends this request IO control code to retrieve information about the available pipes for a device, as configured in the registry.
Major code
IRP_MJ_INTERNAL_DEVICE_CONTROL
Input buffer
NULL.
Input buffer length
None.
Output buffer
A pointer to a buffer that contains a USBFN_CLASS_INFORMATION_PACKET structure. Upon completion, UFX populates the structure with the name, the device interface GUID, and details of the interface when operating at a particular bus speed.
Output buffer length
The size of a USBFN_CLASS_INFORMATION_PACKET structure.
Status block
If the request is successful, the USB function class extension (UFX) returns STATUS_SUCCESS, or another status value for which NT_SUCCESS(status) equals TRUE. Otherwise it returns a status value for which NT_SUCCESS(status) equals FALSE.
Remarks
The class driver should send this IOCTL request during initialization so that it can enumerate the endpoints and attributes.
Requirements
| Requirement | Value |
|---|---|
| Header | usbfnioctl.h |
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