Click Inventory Slot

Packet ID	Direction
0x66	Serverbound

This packet is sent by the client when an inventory slot is clicked. See the inventory page for more information.

Serverbound

Field	Type	Description
Window ID	Byte	The incremental ID of the window. Ranges from 0 to 99
Slot	Short	The id of the clicked slot. See the inventory page for slot mapping.
Right Click	Byte	If client right-clicked
Action number	Short	Something to do with the transaction packet(?)
Shift	Byte	If client shift-clicked
Item Id	Short	The id of the clicked item (-1 if empty slot)
Item Amount	Byte	The amount of the clicked item (only sent if id > 0)
Item Meta/Damage	Short	The meta/damage of the clicked item (only sent if id > 0)

Example Packet

Field	Value
Window ID	2
Slot	22
Right Click	Byte	0
Action number	Short	(?)
Shift	Byte	1
Item Id	Short	50
Item Amount	Byte	63
Item Meta/Damage	Short	0