Damage Items when Crafted

Sorry if I seem repetitive, but I can't figure this thing out. I'm making a hammer item that, when crafted with an iron ingot, makes three chains to be used in chainmail armor. However, I want the hammer to not be destroyed during the crafting, instead taking damage. I've looked through TFC's code and can't figure it out, and I've rummaged through Forge itself and couldn't find anything. Some help would be appreciative, thanks.

You have to use an ICraftingHandler to do some funny things with item cloning with one less damage.

I know that much, but I can't figure out how. The switch from 1.2.5 to 1.3.2 is killing mine, and every other amateur modder's brains. 

I'll go fetch the code I used to make an object like the one you're attempting to make. It's really quite simple.

Like atrain said, you need a Crafting Handler class, and you need to register it in your main mod class with

GameRegistry.registerCraftingHandler(new Your Crafting Handler());

and then inside the crafting handler, which implements ICraftingHandler, your onCrafting method should look a little something like this.

public void onCrafting(EntityPlayer player, ItemStack item, IInventory inv) 
{
  	for(int i=0; i < inv.getSizeInventory(); i++)
	{        	
    	if(inv.getStackInSlot(i) != null)
    	{
    		ItemStack j = inv.getStackInSlot(i);
    		if(j.getItem() != null && j.getItem() == Your Hammer Item)
    		{
    			ItemStack k = new ItemStack(Your Hammer Item, 2, (j.getItemDamage() + 1));
    			inv.setInventorySlotContents(i, k);
    		}
    	}  
	}
}

Basically what this does, is run a check every time something is crafted. It looks in every slot and if it finds Your Hammer Item, it replaces that stack with a new stack of 2 of your hammer item, one of which is used up in the crafting. It also adds one damage to the item.

Happy Modding

It worked, thanks a lot!

This dont work for 1.6.4 need help to use this in 1.6.4 anyone?