Minecraft Forums

Quote from Glampkoo

Hey everyone I have a little problem with /testforblock. So I want to check if a dropper has a specific item and it always shows up a message that it has unbalanced {}. I'm quite experienced with command blocks and redstone and I cant' find a solution to this problem. Here's the command that I use.

testforblock coords here dropper 0 1 {Items:[{id:356,Slot:0}]}.

It always shows up this message:

Data tag parsing failed: Unbalanced curly brackets {}: [{id:356,Slot:0}]}

You'll need to paste the exact command you're using from the command block.

Quote from Glampkoo

testforblock -1674 62 -566 dropper 0 1 {Items:[{id:356,Slot:0}]}

I see, you've included an extra parameter to your /testforblock command. The correct syntax is:

/testforblock X Y Z <BlockID> [Damage] {dataTags}

So your fix should be:

testforblock -1674 62 -566 dropper 0 {Items:[{id:356,Slot:0}]}

Quote from Glampkoo

I corrected now it says this:

The block at -1674,62,-566 had the data value of 3 (expected: 0).

Ok I corrected to 3 this is the command:

testforblock -1674 62 -566 dropper 3 {Items:[{id:356,Slot:0}]}

Now it gives this error:The block at -1674,62,-566 did not have the required NBT keys.I tried everything, still gives me that error.

Note: my dropper is named "Quest"

Quote from Samuel_Birchwood

That would mean it does not have item 356 in slot 0. Try adding Damage:0 and Count:1 to the dataTag

Oh that's right, the /testforblock command falls under the unfortunate bug that requires you to label NBT tag-types. To do this, as Samuel said, you will need to include all 4 base tags of "id", "Damage", "Count", and "Slot", and label their tag-types.

"id" and "Damage" are type 'short', so you label with 's'. "Count" and "Slot" are type 'byte', so you label with 'b'.

Here is the completed command:

testforblock -1674 62 -566 dropper 3 {Items:[{id:356s,Damage:0s,Count:1b,Slot:0b}]}

Quote from Glampkoo

Now I have another problem: I try to check if a dropper has three written books (all of them have damage of value 100) all on specific slots (on the middle line). Here is the command:

testforblock -1674 62 -566 dropper 3 {Items:[{id:387s,Damage:100s,Count:1b,Slot:3b},{id:387s,Damage:100s,Count:1b,Slot:4b},{id:387s,Damage:100s,Count:1b,Slot:5b}]}

Written books do not have any extra damage values; they are defaulted to 0, so a Damage of 100 will not work.

EDIT:

Quote from Samuel_Birchwood

Never mind, I just needed to put the Slot 13 in front of the Slot 15. Wait why are we having this conversation on this thread. Sorry I seriously just realized this is a tellraw thread xD

I hope that the upcoming commands for editing pre-existing blocks don't include this bug. It's not good practice to allow such an oddity to slip past because players are "messing with advanced stuff". It's a feature of the game and should be fleshed out as such.

And same, didn't notice it until I scrolled up a bit. It's fine to go off-topic a bit though! For those wondering, a major thread for help with a good amount of commands (mainly /summon and /give) is here: http://www.minecraftforum.net/topic/1969520-17-using-summon-give-datatags-in-map-making-tutorials/unread/

Quote from Jasper_Skynol

this is going to sound strange but is there a way for tellraw to open a file, ie in %appdata% ./minecraft/saves/test/text.txt instead of a url

Very good question. Unfortunately the action only seems to accept URLs starting with "http://", so you can't do it directly.

Quote from munin295

Does anyone else think this thread should be stickied in the Redstone Discussions and Mechanisms forum? I vote yes.

I'm not sure I agree. I think I'd rather see a stickied topic consisting of an in-depth and complete (or, as complete as possible) topic for all commands/command blocks. That sort of topic would probably take an extremely long time to finish, though; with the addition of dataTag usage, commands have become much more complicated. 1.8 is also just around the corner and will complicate things further with the addition of a number of new commands (which I'm really looking forward to).

Quote from ezfe

New features time!

{"text":"Shift-Click Me","insertion":"Hi!"}

{"text":"","extra":[{"text":"Hover Me (See A Special Pig)","color":"white","hoverEvent":{"action":"show_entity","value":"{id:f8421a68-5457-3961-b0d0-856247c5dd9d,type:Pig,name:\"Awesome Pig\"}"}}]}

In the second example, the id supplied is what the game would typically insert (its a UUID), it is a random one and not special.

Thanks for this! I have to wonder about the "insertion" tag and how it benefits over using the "suggest_command" action, which does the same thing except for regular clicking. Personally I haven't found the "suggest_command" action itself to be too useful to begin with.

Do you know if you can insert any other data into the "show_entity" action? I've tried different methods of adding NBT tags and wasn't successful. The little interface the data appears in seems to be of a fixed height, so I'm doubting it can go any further than just those 3 tags.

I have updated the OP with this new information.

Quote from ezfe

Sorry, forgot to mention. Insertion uses shift click and is currently in vanilla you can click player names in chat to insert it into your text.

show_entity only supports those three tags at the moment.

Thanks, and another thing to note relating to this is when you use:

/say @e

A list of entities and their IDs/names will be provided, using the 'show_entity' action. And shift-clicking these names will insert the ID into the chat input. You can then copy that and paste it in the following testfor:

/testfor @e[id=<PASTE ID>]

Very useful!