Lua Programming Help Thread

[dan369]

Use the latest Luaplayer HM all the Mp3 stuport functions are in the read me

[ifiwere1337]

Use the latest Luaplayer HM all the Mp3 stuport functions are in the read me

okay, i dont know what function to use to load up a random song from a folder, how do i do this?

Mp3me.load()
Mp3me.play()
Mp3me.Stop()
Mp3me.eos() (EndOfStream)
Mp3me.getTime()
Mp3me.percent()
Mp3me.pause()

[SG57]

ifiwere1337 - Think logically about it. You'd get the folder as a directory list, parse all the entries in the list containing a .mp3 extension and add that filepath (or element #) to another array and randomly select from that which to play. Sub-folder searching would require recursive scanning of the root folder you pass and that's a different story.

if your still stuck:

-- This will stop any currently playing song
-- Load and play a random one from PSP/MUSIC/ folder
function PlayRandomSong()
  -- get the files and folders in our music folder
  mp3List = System.listDirectory("ms0:/PSP/MUSIC/")

  -- loop through all the files/folders in our table
  for i = 1, table.getn(mp3List) do
    if string.sub(mp3List[i].name, -4) ~= ".mp3" and   -- if the extension of the file name doesn't end with .mp3
       string.sub(mp3List[i].name, -4) ~= ".Mp3" and   -- and .Mp3
       string.sub(mp3List[i].name, -4) ~= ".mP3" and   -- and .mP3
       string.sub(mp3List[i].name, -4) ~= ".MP3" then  -- and .MP3
      table.remove(mp3List, i)   -- the filename clearly isn't properly named MP3 file so remove it
      i = 0  -- reset the searching variable since our table now has changed
             -- 0 because for loops, atleast in C, default to increase the iterator at the end of the loop
             -- try i = i - 1 instead, should produce the same result (if table.remove works like i think it does)
    end
  end
  
  -- if there is atleast 1 filename in the folder
  if table.getn(mp3List) > 0 then
    -- stop the currently playng mp3 if any
    Mp3me.Stop()
    
    -- now just load a random filename that hasn't been removed
    Mp3me.load( mp3List [ math.random (1, table.getn() ) ].name )
    
    Mp3me.play() -- ...
  end
end

Untested but should work - the method i'm using is removing the non-MP3s from the directory list.

[ifiwere1337]

ifiwere1337 - Think logically about it. You'd get the folder as a directory list, parse all the entries in the list containing a .mp3 extension and add that filepath (or element #) to another array and randomly select from that which to play.

you lost me at think logically, i am a newb to lua and i only understood about half of that

[SG57]

Well if you're still stuck take a look at what I made real quick. It's untested as I don't want to download luaplayer etc. etc.

[dan369]

i need help!!!
I what to scroll ONE image right, but without moving anything blitted apart from the player image.
So when the player's X is more than 260 i will scroll right but not moving anything Blitted (apart from the player.img)
and also keep Blitting that Image, so if the player's X is 480 u would still see the image scrolling right, BUT won't see anything moving that's been Blitted (apart from the player image )

[thecobra]

i need help!!!
I what to scroll ONE image right, but without moving anything blitted apart from the player image.
So when the player's X is more than 260 i will scroll right but not moving anything Blitted (apart from the player.img)
and also keep Blitting that Image, so if the player's X is 480 u would still see the image scrolling right, BUT won't see anything moving that's been Blitted (apart from the player image )

do you mean a scroll map?

[dan369]

yes, which only scrolls left but doesn't move any off the images Blitted (apart from the player image )

[thecobra]

than maybe you can clear the screen when the player reache the 260 x coordinate and then blit the map again with the new coordinate
for example

a = grass
b = bush
p = player
"
aaaaaaaaa
aabaapaaa
aaaaaaaaa
'
when map look like this

aaaaaaaaa
aabapaaaa
aaaaaaaaa

and player press left then map schouold look like this

'
aaaaaaaaa
aaabpaaaa
aaaaaaaaa

so really you are moving the map insted of the player

sorry if i am not clear if you wait a moment i try to make a code for you

[TurtlesPwn]

-- This will stop any currently playing song
-- Load and play a random one from PSP/MUSIC/ folder
function PlayRandomSong()
	-- get the files and folders in our music folder
	mp3List = System.listDirectory("ms0:/PSP/MUSIC/")

	--remove all non-mp3 items in the folder
	i = 1
	while i <= table.getn(mp3List) do
		if string.lower(string.sub(mp3List[i].name, -4)) ~= ".mp3" then 
			table.remove(mp3List, i)
		else
			i = i + 1
		end
	end

	if table.getn(mp3List) > 0 then	--if there is atleast 1 song to play
		Mp3me.Stop()
		Mp3me.load(mp3List[math.random(1,table.getn(mp3List))].name) --load a random mp3 from the list
		Mp3me.play()
	end
end

fixed it up a bit, changed how it does the loop to avoid not knowing how lua does it compared to C etc

[thecobra]

//here load your map make sure it larger than 272 in length
map = Image.load("map.png")

//here you load player
player = Image.load("player.png")

//here you have player x and y value
Px=220
Py=250

//here you have the current postion in the map
mapx = 480
mapy = 272

while true do
pad = Controls.read()

//here we clean up the screen so we could prepare to blit the new map postion
screen:clear()

//here we blit the map from were we are in the map picture
screen:blit(0, 0, map, [maplx, maply, 480, 272], [alpha = true])

//here we blit the player
screen:blit(px, py, player)

//here we check if the player x postion is greated than 270 so if it is then we will change the new position of the map
if pad:left() and Px > 270 then
mapx = mapx + 1
end
end

this is just a example of a scrolling map so it may have some error due to the fact i was doing it in a rush so modifi it as you like

[ifiwere1337]

-- This will stop any currently playing song
-- Load and play a random one from PSP/MUSIC/ folder
function PlayRandomSong()
	-- get the files and folders in our music folder
	mp3List = System.listDirectory("ms0:/PSP/MUSIC/")

	--remove all non-mp3 items in the folder
	i = 1
	while i <= table.getn(mp3List) do
		if string.lower(string.sub(mp3List[i].name, -4)) ~= ".mp3" then 
			table.remove(mp3List, i)
		else
			i = i + 1
		end
	end

	if table.getn(mp3List) > 0 then	--if there is atleast 1 song to play
		Mp3me.Stop()
		Mp3me.load(mp3List[math.random(1,table.getn(mp3List))].name) --load a random mp3 from the list
		Mp3me.play()
	end
end

fixed it up a bit, changed how it does the loop to avoid not knowing how lua does it compared to C etc

thanks for this, it is greatly appreciated, ill mention both you and sg in my credits!!!:Jump:


--edit--
im having trouble, i am using a lua script from bumper harvest, and i add this under the functions, and it does not seem to load, i have tried adding it to many different places, but no luck, if you have a fix for this it would be nice

[FaT3oYCG]

thanks for this, it is greatly appreciated, ill mention both you and sg in my credits!!!:Jump:


--edit--
im having trouble, i am using a lua script from bumper harvest, and i add this under the functions, and it does not seem to load, i have tried adding it to many different places, but no luck, if you have a fix for this it would be nice

i think that where it says the math.random bit you need it in a math.floor so that is is an actual number with no decimals

edit:

i just tested it and that isn't the problem, make sure its above while true do and use the correct name with the same case for all of the words

e.g. if it is Word dont use word

[ifiwere1337]

i think that where it says the math.random bit you need it in a math.floor so that is is an actual number with no decimals

edit:

i just tested it and that isn't the problem, make sure its above while true do and use the correct name with the same case for all of the words

e.g. if it is Word dont use word

im not sure what you mean, could you elaborate?

[FaT3oYCG]

im not sure what you mean, could you elaborate?

it wasnt what i origionally thought but make sure it is like this when you use it

PlayRandomSong()

and not like this

playrandomsong()

[SG57]

-- This will stop any currently playing song
-- Load and play a random one from PSP/MUSIC/ folder
function PlayRandomSong()
    -- get the files and folders in our music folder
    mp3List = System.listDirectory("ms0:/PSP/MUSIC/")

    --remove all non-mp3 items in the folder
    i = 1
    while i <= table.getn(mp3List) do
        if string.lower(string.sub(mp3List[i].name, -4)) ~= ".mp3" then 
            table.remove(mp3List, i)
        else
            i = i + 1
        end
    end

    if table.getn(mp3List) > 0 then    --if there is atleast 1 song to play
        Mp3me.Stop()
        Mp3me.load(mp3List[math.random(1,table.getn(mp3List))].name) --load a random mp3 from the list
        Mp3me.play()
    end
end

fixed it up a bit, changed how it does the loop to avoid not knowing how lua does it compared to C etc

I didn't know Lua had a tolower or toupper string member. Neat :) And ya thx for the fix up, I expected no less ;)

[ifiwere1337]

it wasnt what i origionally thought but make sure it is like this when you use it

PlayRandomSong()

and not like this

playrandomsong()

okay i changed playrandomsong() to PlayRandomSong(), and it still wont work, i dont know why, but it is getting really annoying trying to fix this

[SG57]

ifiwere1337 - Post your usage, and keep in mind how bumper harvest's program flow is (it might have nested inifinite loops, etc. keeping it from running)

[ifiwere1337]

ifiwere1337 - Post your usage, and keep in mind how bumper harvest's program flow is (it might have nested inifinite loops, etc. keeping it from running)

kk just a minute
code removed due to length

[SG57]

ifiwere1337... I didn't say post the entire source, I said post the usage of it. And strangely enough you aren't even using it. I highly suggest you learn a little more before you do stuff like this, it makes alot of people's head aches less frequent when that happens. I made you a function, you have yet to actually call it / use it.

[Nielkie]

kk just a minute

i didnt know what parts to add so i put them all

Umm, you need to call it from somewhere...

EDIT: Beaten.

[ifiwere1337]

ifiwere1337... I didn't say post the entire source, I said post the usage of it. And strangely enough you aren't even using it. I highly suggest you learn a little more before you do stuff like this, it makes alot of people's head aches less frequent when that happens. I made you a function, you have yet to actually call it / use it.

ah damnit, lol sorry a newb mistake, ill try and fix it, sorry for the waste of time, im only learning


---edit---

now i have a prob, i added a line to call the function PlayRandonSong() and all i get is an error on lua player, what i am wondering is if i need to put anything in the parentheses or not?

[SG57]

Paste the error... seems like common sense when something goes wrong doesn't it? ;)

[ifiwere1337]

Paste the error... seems like common sense when something goes wrong doesn't it? ;)

oops sorry on the lua player screen it says this

Error: index.lua:24 : attempt to call field 'stop' (a nil value)

[Lone_Wolf_O_o]

oops sorry on the lua player screen it says this

i think it is the way you put it like when you put "stop" is should be "Stop" or something.

but i dont know because im new to this. i only started learning today but i had to register to see these threads, which are very helpful by the way thank you qj'ers.

have fun

wolfy

[ifiwere1337]

i think it is the way you put it like when you put "stop" is should be "Stop" or something.

but i dont know because im new to this. i only started learning today but i had to register to see these threads, which are very helpful by the way thank you qj'ers.

have fun

wolfy

never thought to check that, i seen stop, but didnt think Stop

--edit--
no it is Stop, but i took the media engine off and ill try that


--edit--

nope its not the media engine thats stopping it

[Lone_Wolf_O_o]

hmm ok then maybe it is this bit

        Mp3me.Stop()
        Mp3me.load(mp3List[math.random(1,table.getn(mp3List))].name) --load a random mp3 from the list
        Mp3me.play()

maybe you cant stop it before loading or playing it

[ifiwere1337]

hmm ok then maybe it is this bit

        Mp3me.Stop()
        Mp3me.load(mp3List[math.random(1,table.getn(mp3List))].name) --load a random mp3 from the list
        Mp3me.play()

maybe you cant stop it before loading or playing it

okay that got rid of that error, but now i have a new error

Error: index.lua : 25: can't open sound file ms0/PSP/GAME/Bumper Harvest-pegglemod/Led Zepplin - Led Zeppelin - Rock and Roll.mp3.

the problem is that the player thinks that the song is in the game folder, and i want it to recognize it in the PSP/MUSIC folder.

any help?

[Lone_Wolf_O_o]

mp3List = System.listDirectory("ms0:/PSP/MUSIC/")

i think that should be

System.currentDirectory("ms0:/PSP/MUSIC/")
mp3List = System.listDirectory()

because i have just looked at a file browser example and that is what it was like
-= Double Post =-
wait i just looked at another one and that is fine so i dont think its that

but it says its a problem loading.

wouldn't that just load the song file from the current directory ?

couldn't you just add a bit on

Mp3me.load(ms0:/PSP/MUSIC/mp3List[math.random(1,table.getn(mp3List))].name) --load a random mp3 from the list

[ifiwere1337]

mp3List = System.listDirectory("ms0:/PSP/MUSIC/")

i think that should be

System.currentDirectory("ms0:/PSP/MUSIC/")
mp3List = System.listDirectory()

because i have just looked at a file browser example and that is what it was like
-= Double Post =-
wait i just looked at another one and that is fine so i dont think its that

but it says its a problem loading.

wouldn't that just load the song file from the current directory ?

couldn't you just add a bit on

Mp3me.load(ms0:/PSP/MUSIC/mp3List[math.random(1,table.getn(mp3List))].name) --load a random mp3 from the list

OMG NOW IT WORKS, the only problem is that it is choppy, but the framerate of the game stays the same

--edit--

thanks all who helped, i will add you to my credits

also if anyone can help me with a problem, i want to load a config file, called config.cfg

say i want redballscore=20
i put

config 1
12
config 2
123
config ...
1337
redballscore
20

in the config file, and under redball score i put redballscore=config line8
or something similar, is this possible with lua?