Description
Get the current alternate setting for the specified interface.
Files
usbdev_api.c
Prototype
Arguments
dev
General handle to device.
if_nbr
Interface number.
p_err
Pointer to variable that will receive the return error code from this function:
ERROR_SUCCESS
ERROR_INVALID_HANDLE
ERROR_INVALID_PARAMETER
Returned Value
Current alternate setting number, if NO error(s).
0, otherwise.
Callers
Application.
Notes / Warnings
This function gets the current alternate setting number used internally by WinUSB and gets the one from the device by sending a GET_INTERFACE request. Both alternate setting numbers are compared. If they match, the current alternate setting is returned.