Posted April 3, 20169 yr Hi, Is it somewhat illegal to create an ItemStack of Blocks.cake? The following code is throwing a NullPointerException for me: new ItemStack(Blocks.cake).getDisplayItem() The root of the problem is that such an ItemStack has a null item internally. Why is that? This doesn't seem to be the case for ItemStacks of other types of blocks... just you wait!
April 3, 20169 yr Try using Block.getItemForBlock(Blocks.cake) or something like that. If that doesn't work, then the cake block doesn't have a corresponding ItemBlock (like doors), but a special Item, so you'd use Items.cake or whatever it's called instead. http://i.imgur.com/NdrFdld.png[/img]
April 3, 20169 yr Cake does not exist as an itemblock, you want Items.cake Mojang removed the "technical" block items that should never be in you inventory (like unlit redsome torches) Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable. If you think this is the case, JUST REPORT ME. Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice. Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked. DO NOT PM ME WITH PROBLEMS. No help will be given.
April 3, 20169 yr If that doesn't work, then the cake block doesn't have a corresponding ItemBlock (like doors), but a special Item, so you'd use Items.cake or whatever it's called instead. This is the case. Cake and a few other blocks have separate Item forms that aren't regular ItemBlock s. Items.cake stores the Item form of Cake. Look for usages of ItemBlockSpecial (1.9) or ItemReed (1.8.9 and earlier) to see which blocks have separate Item forms. Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.
April 3, 20169 yr Author I see. I'll do some exploration, but at least now I understand what is happening. Is there any generic way to know if I have such a block in hand? Ideally, I want to be able to receive any block in a method and call getDisplayName (or something similar) on it, being it one of those special blocks or not. But then, I guess I would need a generic way to get the item corresponding to the block, in other words, a non-hardcoded way to know that Blocks.cake corresponds to Items.cake for example. Is there such a thing available or should I write a mapping myself? Thank you guys! just you wait!
April 3, 20169 yr Minecraft doesn't have any mapping between these blocks and their custom items, as far as its concerned they're completely unrelated. It only maintains a mapping for blocks that use a standard ItemBlock . There are two ways you can create this mapping: Hardcode the vanilla block-placing Item s (that don't extend ItemBlock ) and their corresponding Block Iterate through the item registry, find any instances of ItemBlockSpecial / ItemReed and extract their Block The first way will obviously only work for vanilla blocks. The second way will work for any vanilla and modded blocks that use ItemBlockSpecial , but not ones that use their own unrelated Item class (e.g. Items.sign , which is an instance of ItemSign ). This mapping may not be 1:1, it's possible for there to be several Item s that place the same Block or for a single Item to place multiple Block s (e.g. ItemSign can place Blocks.standing_sign or Blocks.wall_sign ). Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.
April 4, 20169 yr Author So, if I'm understanding correctly, we can always go from Item to Block (or multiple blocks sometimes), and going from Block to Item is usually possible but will sometimes fail? just you wait!
April 4, 20169 yr So, if I'm understanding correctly, we can always go from Item to Block (or multiple blocks sometimes), and going from Block to Item is usually possible but will sometimes fail? For most Block s, Item.getItemFromBlock and Block.getBlockFromItem will convert between the Block and its ItemBlock . Some Block s have a separate Item form, but there's no 100% reliable way to convert between these. You can hardcode the vanilla instances and/or check for the vanilla classes, but you can't cover mods that use their own Item class. Some Block s don't have any Item form. Some Item s (in fact most of them) don't place a Block at all. Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.
April 4, 20169 yr And some are weirdly related, like seeds. Seeds are absolutely not the item form of a block, yet when used they create a block, when that block is middle-clicked, you get a seed, and when the block is broken, you get the seed (usually!) But you can also get seeds from breaking tall grass (which has its own itemblock!) Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable. If you think this is the case, JUST REPORT ME. Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice. Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked. DO NOT PM ME WITH PROBLEMS. No help will be given.
April 6, 20169 yr Author I see, lots of weird relations indeed. So for something like Block.grass I probably would not have any other option than to hardcode some arbitrary relation, I guess. No big deal but good to know. Thank you guys! just you wait!
April 6, 20169 yr Blocks.grass uses a standard ItemBlock that will be returned from Item.getItemFromBlock . Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.
April 18, 20169 yr Author After some exploration around this topic, I'm puzzled with one specific case. Why can't Item.getItemFromBlock(block) work for the door's blocks? Apparently, all of them have their counterparts, like Blocks.acacia_door and Items.acacia_door, so what is wrong with that? just you wait!
April 18, 20169 yr (getPickBlock is probably going to be the more useful option in the general-case) Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable. If you think this is the case, JUST REPORT ME. Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice. Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked. DO NOT PM ME WITH PROBLEMS. No help will be given.
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