Using NBT in a KeyHandler

[Asweez]

I have a key handler that I want to change nbt tags of the item in the player's hand whenever I press the key. How would I do so?

[Draco18s]

Register a key handler

Send a packet to the server

Server gets the packet and modify's the item

[Asweez]

Register a key handler

Send a packet to the server

Server gets the packet and modify's the item

How would the packet modify the nbt of the item though?

[shadowfacts]

The packet doesn't modify the NBT, it tells the server which player's inventory to modify, which slot, and what the modification should be. In the onMessage of the packet handler the server modifies the the correct item. For packets I suggest using this tutorial.

[Belpois]

Make sure to set NBT Tags when the server is handling the code.

 

Side side = FMLCommonHandler.instance().getEffectiveSide();
if (side == Side.SERVER)
{
        // Update the NBT Tags
}

 

Simply send the key pressed event to the server, update the NBT Tags on the server and the client should be updated automatically.

 

Some pseudo code (Server side):

EntityPlayerMP ep = getEntityPlayerMP();
PlayerInventory pi = ep.inventory;
ItemStack is = pi.getCurrentItem();

if(!is.hasTagCompound())
{
        is.stackTagCompound = new NBTTagCompound();
}

NBTTagCompound nbttc = is.stackTagCompound;

nbttc.setString("somthing", "something");

 

Hope this helps

 

P.S. Now sending the key event to the server and getting the player from that event is up to you as I do not know how your code looks like, but usually Network Packets send the EntityPlayerMP with them.

[Draco18s]

You shouldn't need to check sides.  A packet handler is already sided and the client can't send a packet to itself (SSP exception, but its still threaded).

[Belpois]

Yes, that's true the Sides thing can be left out.

 

Unless you are updating your NBT Tag on one of the Minecraft Events, such as OnRightClick or block activated those fire on both the server and the client.