Need help with computercraft!

[HighDangerr]

I have a problem.

I want to use computercraft with mystcraft to set portals.
but i get a error from the books code.

1. local data = {}
2. rednet.open("right")
3. p = peripheral.wrap("bottom")
4. 
   
5. function clearInv()
6. for i = 1,16 do
7. turtle.select(i)
8. turtle.dropDown()
9. end
10. end
11. 
    
12. function checkSlots(id)
13. data = {}
14. local slot
15. local name
16. local slots = p.getAllStacks()
17. for i,j in pairs(slots) do
18. slot = i
19. name = j["destination"]
20. -- print(name)
21. data[slot]=name
22. end
23. rednet.send(id,"done")
24. end
25. 
    
26. function removeSlot(slot)
27. p.pushItem("up", slot, 1)
28. rs.setOutput("left", true)
29. sleep(1)
30. rs.setOutput("left", false)
31. end
32. 
    
33. function book(slot,id)
34. p.pushItem("up", slot, 1)
35. turtle.select(1)
36. turtle.drop()
37. sleep(5)
38. getBook()
39. turtle.select(1)
40. turtle.dropDown()
41. rednet.send(tonumber(id), "done")
42. end
43. 
    
44. function getBook()
45. turtle.suck()
46. end
47. 
    
48. function getNames(id)
49. local nameTbl = textutils.serialize(data)
50. rednet.send(tonumber(id), nameTbl)
51. end
52. 
    
53. clearInv()
54. 
    
55. while true do
56. local id, msg, dis = rednet.receive()
57. local newmsg = string.match(msg, "%a+")
58. -- print(msg)
59. if newmsg == "checkSlots" then
60. checkSlots(id)
61. elseif newmsg == "getNames" then
62. getNames(id)
63. elseif newmsg == "remove" then
64. removeSlot(tonumber(string.match(msg, "%d+")))
65. rednet.send(id,"done")
66. elseif newmsg == "books" then
67. slot = string.match(msg, "%d+")
68. book(tonumber(slot), id)
69. end
70. end

this is the code. and it says line 16 is attempt to call nil! can anyone help me please?

 

[Democretes]

First of all the getBook() function doesn't need to exist. You call it once and use it to replace a turtle.suck().

What peripheral are you wrapping btw? You're calling p.getAllStacks() and I"m pretty sure that's not even a thing.

 

[HighDangerr]

i am trying to get the books in the book receptacle. And this was a code what i found on the internet

 

[HighDangerr]

Please help me!

 

[Democretes]

Figure out what peripheral they were wrapping. That'll probably do most of the work for you.

 

[HighDangerr]

they were wrapping a chest to see wat is in the chest.

 

[SkyBoy96]

I think the getAllStacks function will include empty slots, giving you nil values. You will need to do something like this (example code, functions may be different)

slots=chest.getmaxInventorySize()
for i=1,slots do
  item = chest.getStackInSlot(i)
  --Do stuffs with the item here
end