Determine the current alternate interface.

int32_t UsbGetAltInterface( 
    int32_t udev, 
    uint8_t *altnum
);

Parameters

udev

Device handle from UsbOpenDevice.

altnum

Pointer to a variable to receive the current alternate interface ID.  

Return Values

USB_ERR_NORMAL_COMPLETION	Success.
USB_ERR_NO_STACK	The USB stack is not ready.
USB_ERR_MEMORY	Memory could not be allocated for the operation.
USB_ERR_TIMEOUT	The device did not respond.

Requirements