Minecraft – Why don’t vanilla Minecraft “Exp Shops” work when Single Player Commands is installed

minecraft-java-editionmods

An Exp Shop is a button that, when pressed, will give you items in exchange for a set amount of exp. You build one by placing a button on a wall, and putting two repeaters and command blocks behind it. Here is a diagram:

 b  = button
[ ] = wall
 r  = repeater
[c] = command block

 b [ ] r [c] r [c]

In the first command block, you give the player the item if they have enough xp: give @p[lm={XP}] {ITEM ID} {QUANTITY}. In the second command block, you take xp from them: xp -{XP}L @p[lm={XP}]

The problem is that when single player commands are installed, it will take xp from the player but it won't give them the item. If single player commands are not installed, it works perfectly.

Is there a way to make it work both with and without single player commands?

Best Answer

As pointed out by SevenSidedDie, SPC overrides a few of the default commands, one of them most likely being /give. Do /help give to view about the command.

Yeah, a lot of Adventure maps say "Don't use SPC, it stuffs up our command blocks…" I'm not sure why the SPC devs decided to edit vanilla commands.

Related Solutions

Minecraft – I need help with /execute

To fix the command:

@e[type=Player] can just be @a
There is no air with a data value of 1, so the detect will never succeed; it should be 0
The data value in /fill should come before the old block handling mode

So your command should be:

execute @a ~ ~ ~ detect ~ ~-2 ~ air 0 fill ~-2 ~-1 ~-2 ~1 ~-1 ~1 barrier 0 destroy

I'm not sure if this really does what you want it to though. There is no way to execute two separate commands in a command block, nor is there any way to have a delay in a single block.

Minecraft – How to Use /testfor Command to Check Item in Player’s Inventory

It's very difficult to see whether someone has an object anywhere in their inventory. That would take 36 command blocks, one for each slot! You can, however, take the object, then see if taking the object worked.

The Commands

Set up a fast clock (but not as fast as a fill clock)
One command block does /clear @p iron_ingot 0 1 (clears 1 iron ingot from the nearest player. You can choose which player, but it must be exactly one. Also, you must use the same selector throughout all these commands.)
Run a comparator from that command block to another command block running this command: /scoreboard players add @p ironIngots 1 (Increases the player's ironIngots score by 1. Make sure you create ironIngots first!)
Create another command block that does whatever you want. In the case of giving them a diamond, you would do this: /give @p[score_ironIngots_min=10] diamond. Note the target selector; it gives the player the diamond only if their ironIngots score is 10 or greater.
The last thing you want to do is take the ironIngots score away so they don't keep getting items. Just run /scoreboard players remove @p[score_ironIngots_min=10] ironIngots 10. This removes 10 iron ingots from the player if they have an ironIngots score of 10 or greater. Any player who matches this will have received a diamond in the previous step.

How to Set Them Up

The commands listed above must run in order. It is actually very simple to put them in order. Just open the debug menu and look at the stylish new crosshair. Align the command blocks along either the green or red line so that one of those lines points down the first to the last command block.

Notes

You don't have to press a button to use this, you just have to be the nearest player. You can change the command to the nearest player within 10 blocks, nearest player on a team, etc.
The commands will take a short amount of time to finish, but for 10 iron ingots, it will only take half a second. It's one tick (1/20 of a second) per item taken away.
It will take away iron ingots even if you don't have ten. However, you can submit one, then later submit five, then submit four more later, and it will still give you the diamond. You can also submit 14 at a time and the extra 4 will be saved for later.