Lua Programming Help Thread

[Judas]

I wish I could, but I don't have a miniUSB on hand. XD Could someone else try it in my stead?

Edit: Nevermind, my dad had one on hand. It turns out it is just a Windows LUAPlayer error. Thanks anyway. ^_^

System.listDirectory doesn't work on LuaPlayer for Windows.

[FaT3oYCG]

wanna bet i got it to work but as its on windows its relevant to your computer although after making it i realized it was useless unless your checking if ur file browser works

here is the code

White = Color.new(255, 255, 255)
Orange = Color.new(235, 115, 0)

System.currentDirectory("C:\\")
listitem = System.listDirectory()
number = table.getn(listitem)

current = 1
y = 10

oldpad = Controls.read()

while true do

pad = Controls.read()

screen:clear()

System.usbDiskModeActivate()

if current > number then current = 1 end
if current < 1 then current = number end

for i = 1, number do
screen:print(10, y * i, listitem[i].name, White)
end


screen:print(10, y * current, listitem[current].name, Orange)


if
pad:up() and oldpad:up() ~= pad:up() then
current = current - 1
end

if
pad:down() and oldpad:down() ~= pad:down() then
current = current + 1
end


if
pad:cross() and listitem[current].directory == false
then
if
string.sub(listitem[current].name, -4) == ".lua"
then
screen:clear()
dofile(listitem[current].name)
end
end


if
pad:cross() and oldpad:cross() ~= pad:cross()
then
System.currentDirectory(listitem[current].name)
current = 1
listitem = System.listDirectory()
number = table.getn(listitem)
end


if
pad:triangle() and oldpad:triangle() ~= pad:triangle()
then
System.currentDirectory("\\")
current = 1
listitem = System.listDirectory()
number = table.getn(listitem)
end

if Controls.read():start() then
break
end

oldpad = pad

screen.waitVblankStart()
screen.flip()

end

sorry for the bad layout its from an old file browser that i coded discovering what the specific functions and variables do - i also looked at tp's code so credit to him for whatever i have used from his just to be safe

[HaxxBlaster]

System.listDirectory doesn't work on LuaPlayer for Windows.

That's not correct, i just used it yesterday. It does work.

[FaT3oYCG]

That's not correct, i just used it yesterday. It does work.

as i also said you could use my code that is above with luaplayer windows

it allows you to browse your c drive but with simple changes any drive could be browsed

thanks ne way

[michaelp]

Does anyone know if there is a string function that can get you a letter in the string?

As in:
myString = "michaelp"

How do I access the letters? Just to find out what they are and to use them for printing?
Can you do this?

myString[1]?

[FaT3oYCG]

what do you mean by accessing the letters to use them for printing

string.sub(string, start character, end character)

might be what your after but if you just wanted to print it why wouldn't you use

screen:print()

The string library

Lua supplies a range of useful functions for processing and manipulating strings in its standard library. More details are supplied in the StringLibraryTutorial. Below are a few examples of usage of the string library.

> = string.byte("ABCDE", 2) -- return the ASCII value of the second character
66
> = string.char(65,66,67,68,6 9) -- return a string constructed from ASCII values
ABCDE
> = string.find("hello Lua user", "Lua") -- find substring "Lua"
7 9
> = string.find("hello Lua user", "l+") -- find one or more occurrences of "l"
3 4
> = string.format("%.7f", math.pi) -- format a number
3.1415927
> = string.format("%8s", "Lua") -- format a string
Lua

also check this out

http://lua-users.org/wiki/StringLibraryTutorial

[michaelp]

You know how in C++, you can access a character in the string class by naming the string variable, then using this: []
string myString = michaelp;
myString[0]; would be m.

How can I do that same thing in LUA? Is there a string function for that?

[FaT3oYCG]

for that you would have to use string.sub()

simple function

function findchar(string, character)
string.sub(string, character, character)
end

- im not sure you might have to use character + 1 for the second value as i haven't tested it

then to use

myString = michaelp

first_character = findchar(mystring, 0)

screen:print(10, 10, first_character)

that should print the "m" but you can use it in any way

if you need an example script just ask and ill test it for you aswell

[michaelp]

Okay, now that I know the function I got it.
Thanks. :)

[youresam]

fatboy:
*listDirectory in windows lua player is a DUMMY FUNCTION (its hardcoded)
*your "findchar" function returns nil, not a string
*myString = michaelp, you forgot quotes

If you don't know Lua well enough to teach it to others, I suggest you don't.

[Anti-QuickJay]

fatboy:
*listDirectory in windows lua player is a DUMMY FUNCTION (its hardcoded)
*your "findchar" function returns nil, not a string
*myString = michaelp, you forgot quotes

If you don't know Lua well enough to teach it to others, I suggest you don't.

Mr. youesam, I thought it was a good thing for noobs to help others?

[youresam]

Mr. youesam, I thought it was a good thing for noobs to help others?

..not if they're giving misinformation. It just makes matters worse.

[Slasher]

..not if they're giving misinformation. It just makes matters worse.

annnd I think im going to have to agree with youresam on this matter.

[FaT3oYCG]

fatboy:
*listDirectory in windows lua player is a DUMMY FUNCTION (its hardcoded)
*your "findchar" function returns nil, not a string
*myString = michaelp, you forgot quotes

If you don't know Lua well enough to teach it to others, I suggest you don't.

thanks for telling me about listdirectory but about my function as i said i hadnt tested it and only said that it should work

as you pointed out it wouldnt because i forgot to put quotes in but that is simple to solve if i would have tested it then i would have found that error and it would work

other than that i can only say that i am not a noob when it comes to lua i have heard of your "superior", and "enlightened" coding skills so you may be better than me but that does not mean that everyone that is beneath you is a noob

i know that anti-quickjay said "I thought it was a good thing for noobs to help others?" but as you put it "..not if they're giving misinformation" implies that i am a noob

anyway i dont want to start any grudges so ill leave it there

[youresam]

I'm not saying I'm "superior" to anyone, and I didn't call you a noob. I don't even know who you are, btw. I just saw how many mistakes you made on a single page of a lua help thread, and felt as if I should correct you.. thats all ;)

[Anti-QuickJay]

Mr. youesam, I thought it was a good thing for noobs to help others?

I was being sarcastic fyi >_>....

[%chrono trigger%]

question probably been asked before, but oh well. Is there a luaplayer version that works on the slim?

[FaT3oYCG]

question probably been asked before, but oh well. Is there a luaplayer version that works on the slim?

i thnk there was a ported version but not everything worked

if someone would care to mention which commands need to be changed to make it work on a slim i will change them

but i also thought that there were 1.00 releases made wouldnt they work on a slim i woulnt know because i havent bothered to try it

thanks

[%chrono trigger%]

i just tried v.20 and it wont work at all for me on a 3.71 m33-4 slim psp

[FaT3oYCG]

ok my bad it looks like the lua players need changing to work on a slim mainly while compiling i just tried with 0.16 but i couldn't get it to work on my psp slim 3.71 m33-i forgot i haven't updated think its 2

lol

well until someone explains what needs changing i cant help you

there was definatley one ported version of luaplayer to 3.xx but i cant remember where i saw it or who it was from

a quick google search may return a few results

but i could try making 0.20 3.xx compatible ill give it a go for you now

[Anti-QuickJay]

Their was a version ported to M33.
Use LuaPlayer version .20(1.00) and out it in PSP/GAME
Fatboy: You cannot help him out anyways since you don't know C

[Muhie]

I have a slim psp with 3.71 M33-4 firmware and luaplayer works fine for me :)

You must use luaplayer 0.20 (Firmware 1.00 ) , then you just put it in ms0:/PSP/GAME and it should work !

[%chrono trigger%]

i thought this would help, but i cant get it to work oh well
http://dl.qj.net/LuaPlayer-for-Team-...4654/catid/151

edit
ok ill try the 1.00 version of lua player
edit
still not working wonder what the deal is

[FaT3oYCG]

hey chrono i updated to m33-4 just and used that one that you linked too and it works for me now thanks i dont know why it wont work for you tho

make sure that in recover it is set to 3.71 kernel and that it is in psp/game/luaplayer

[%chrono trigger%]

i see what was the problem it was my game that i was making it wont run on 3.71 apparently or something. So that presents a new problem is there a guide or anyone know how to get it working for 3.71?

[Anti-QuickJay]

You set your kernel to 3.71 in the recovery menu?

[%chrono trigger%]

yep

[Anti-QuickJay]

Do you have the kernel add-on v2?

[%chrono trigger%]

i didnt think that worked for a slim does it?

[FaT3oYCG]

i thought this would help, but i cant get it to work oh well
http://dl.qj.net/LuaPlayer-for-Team-...4654/catid/151

edit
ok ill try the 1.00 version of lua player
edit
still not working wonder what the deal is

chrono if you use the version that you directed to and put it in ms0:/PSP/GAME/HERE

then it works on a slim but you have to use that version of the lua player