Arduino Uno + USB Host Shield | Get USB Input

Hello dear People,

actually I have a few problems to get started with the Arduino (and USB Host Shield).
I want to make the arduinos some things. But before the Arduino go to make these things there must be an Input on the USB Port on the USB Host Shield.

My Problem now is, that I dont find any Library with function or methord to register an input.

I've downloaded the official Library for the USB Host Shield (GitHub - felis/USB_Host_Shield_2.0: Revision 2.0 of USB Host Library for Arduino.) and searched the examples and the documentation, but I don't find any function to simple get a Input on the USB Port like "get(USB HOST SHIELD INPUT)" or something else.

Could someone please help me ?

With best regards.

Read Arduino reference. There You can find functions reading the USB.