Lua Programming Help Thread

[KleptoOne]

Obsessive Compulsive Disorder. Like a guy who has to snap his fingers 5 times before opening a door or washing his hands every 5.2 minutes on the dot. That kind of thing.

[PSPJunkie_]

I'm OCD. More on the line of washing my hands than the snapping my fingers...

[Urameshi]

i'm just stoopid

[ahrimanes]

hii there. i have got somthing strange 2 time by now.... i mean.. i was making some code. testing then turnoff psp, and when i back, the code no longer works.... wy ?... luaplayer corrupt files when turn off playing ?.... how to correct my damaged codes?..

[xpack]

i dont think there is a way to fix "currupted files" you could try deleting them then replacing them. i had a simular problem like this but once i did that it all worked

[k0ud]

u mean everytime we turn off while using it then it corupts?..

[myschoo]

i think it can corrupt if u have usb enabled or something like that

[xpack]

yeah if you using a certain file at the time and you overwrite it then the file become currupt and windows will not let you delete it so you have to delete it with something like IRSHELL

[ahrimanes]

well i can see the content of the files, my images are visible.. jsut causes he wont, my code crash and reset the psp. but i turned it off working... and i wass on street so no usb...

[k0ud]

how can i make my screenshots in different names eg screenshot1,screenshot2,a nd so on..

and also how browse a file then copy it to another location when pressed?

[xpack]

how can i make my screenshots in different names eg screenshot1,screenshot2,a nd so on..

and also how browse a file then copy it to another location when pressed?

For the screenshot thing yeah you can heres a code from soulkiller

SUBMITTED BY: Soulkiller 
oldpad = Controls.read()
while true do
pad=Controls.read()
if pad:select() and pad:select() ~= oldpad:select() then screenshot("ms0:/PSP/PHOTO")
end
oldpad = pad
end

Code:               
function screenshot(folder)
local directory = {}
local counter = 1
for index, file in System.listDirectory(folder) do
        directory[counter] = file.name
        counter = counter+1
end
local max = 0
for length = 1,table.getn(directory) do
        for length2 = 1,table.getn(directory) do
                if directory[length2] == "screenshot"..length..".png" then
                        max = length
                end
        end
end
max = max+1
screen:save(folder.."screenshot"..max..".png")
end

And the filebrowser just use something like this that tactical penguin made up but edit it so that is moves the file to where you want. Try using SG57's Luaplayer mod w/ flash but instead dont flash it to flash0:/ but to wherever it is you want it to.

System.currentDirectory("ms0:/")
white = Color.new(255,255,255)
red = Color.new(255,0,0)
fbrowser = {s = 1, fl = System.listDirectory("ms0:/"),ls = 1, sp = 10}

fbrowser.nf = table.getn(fbrowser.fl)
oldpad = Controls.read()

function runfbrowser()

	for i = ((fbrowser.ls-1)*fbrowser.sp)+1, fbrowser.ls*fbrowser.sp do

		if fbrowser.nf >= i then

			screen:print(0,((i-((fbrowser.ls-1)*fbrowser.sp))*10)-10,fbrowser.fl[i].name,white)

		elseif fbrowser.nf < i then break end

	end

	

	screen:print(0,((fbrowser.s-((fbrowser.ls-1)*fbrowser.sp))*10)-10,fbrowser.fl[fbrowser.s].name,red)


	if pad:down() and not oldpad:down() then fbrowser.s = fbrowser.s + 1 end

	if pad:up() and not oldpad:up() then fbrowser.s = fbrowser.s - 1 end



	if fbrowser.s > fbrowser.nf then fbrowser.s = fbrowser.nf elseif fbrowser.s < 1 then fbrowser.s = 1 end



	if fbrowser.s > fbrowser.sp*fbrowser.ls then fbrowser.ls = fbrowser.ls + 1

	elseif fbrowser.s < ((fbrowser.ls-1) * fbrowser.sp)+1 then fbrowser.ls = fbrowser.ls - 1 fbrowser.s = (fbrowser.ls)*fbrowser.sp end

	if pad:cross() and not oldpad:cross() then

		if not fbrowser.fl[fbrowser.s].directory then

			if string.lower(string.sub(fbrowser.fl[fbrowser.s].name, -4)) == (".png" or ".jpg") then

				img = Image.load(fbrowser.fl[fbrowser.s].name)

				screen:clear()

				screen:blit(240-img:width()/2,136-img:height()/2,img)

				screen.flip()

				viewingimg = true

				while viewingimg do

					if Controls.read():circle() then viewingimg = false img = nil end

					screen.waitVblankStart()

				end

			end

		elseif fbrowser.fl[fbrowser.s].directory then

			System.currentDirectory(fbrowser.fl[fbrowser.s].name)

			fbrowser.s = 1

			fbrowser.fl=System.listDirectory()

			fbrowser.nf=table.getn(fbrowser.fl)
			fbrowser.ls = 1

		end

	elseif pad:triangle() and not oldpad:triangle() then

		if System.currentDirectory ~= "ms0:/" then

			System.currentDirectory("./..")

			fbrowser.s = 1

			fbrowser.fl=System.listDirectory()

			fbrowser.nf=table.getn(fbrowser.fl)
			fbrowser.ls = 1

		end

	end

end

while true do
	pad = Controls.read()
	screen:clear()
	runfbrowser()
	screen.waitVblankStart()
	screen.flip()
	oldpad = pad
	if pad:start() then break end
end

[SG57]

ai -

g_Screenshot = 0

oldpad = Controls.read()

while true do
     pad = Controls.read()

     if pad:select() and pad ~= oldpad then
          g_Screenshot = g_Screenshot + 1
          screen:save( "ms0:/PSP/PHOTO/yourGame/screenshot" .. g_Screenshot .. ".png" )
     end

     oladpad = pad
end

Whether or not the screen shot function is screen:save is beyond me, so go find it. Also, this will overwrite old screenshots if you restart the app, as g_Screenshot = 0 again. You could use the method above me to get the last screenshot number and assign it to g_Screenshot.

As for your other question, NO! I will not write a file browser for you and have it copy whatever file pressed to another place. You are so specific I can already tell you're creating a flashing app... You know no one will do what you ask, at least want to... , if they can determine what you're making completely... xpack shouldnt have given you it either, but still...

I advise you to read up on the System.listCurrentDirecto ry function (i believe thats what it's called) and learn to do it yourself to take all the credit...

[Bob Hoil]

I have a question guys. Ok i have collision code but when they collide it just restarts. I want it so that it destroys the object. Removes it from the screen. Can someone tell me how to do this.

Thanks Bob Hoil

[xpack]

Post your code so that we can see whats wrong with it

[k0ud]

ok thx guys:)

Sg57: yeah i did.. its already released.. but my psp's LCD is broken for 1month or so... so i forgot a lil about LUA..

that's why im remaking it:) lol

another question:
if i flash a file but the file im trying to flash is not there, how can i make a warning that the file is not there? so i wont get error

[xpack]

ok thx guys:)

Sg57: yeah i did.. its already released.. but my psp's LCD is broken for 1month or so... so i forgot a lil about LUA..

that's why im remaking it:) lol

Huh mine too :Argh:

[k0ud]

so how do i do it xpack?

[TacticalPenguin]

blah = io.open(filetocheck,"r")
if blah then
fileexists = true
blah:close()
end

[xpack]

i think its something like

if "ms0:/PSP/GAME/Whatever/whatever.rco" then
-- your code here
else
screen:print(10,10,"File Not Found",color)
end

at least i think thats how it works (this was just off the top of my head)...

Oh or try tp's way that sound like it might work, i was typing when it was posted

[k0ud]

ok thx to you guys:) ill try it later.. im at school >.< lol

[Bob Hoil]

background=Image.load("images/menu.png")
fb=Image.load("images/fb.png")
fbclicked=Image.load("images/fbclicked.png")
apps=Image.load("images/apps.png")
appsclicked=Image.load("images/appsclicked.png")
wb=Image.load("images/wb.png")
wbclicked=Image.load("images/wbclicked.png")
games=Image.load("images/games.png")
gamesclicked=Image.load("images/gamesclicked.png")
mp=Image.load("images/mp.png")
mpclicked=Image.load("images/mpclicked.png")
white=Color.new(255,250,250)
cursor = Image.load("images/cursor.png")

sensitivity = 40
maxspeed = 3

cursor = {x = 30, y = 100, w = 32, h = 32, oldx = 200, oldy = 50, img = Image.load("images/cursor.png"), s = 4}

buttonimg = Image.load("images/fb.png")
button={}
button[1] = {x = 21, y = 234, h = buttonimg:height(), w = buttonimg:width()}

function moveCursor()
pad=Controls.read()
if pad:analogX() < -sensitivity or pad:analogX() > sensitivity then
     cursor.x = cursor.x + pad:analogX()/(128/maxspeed)
end
if pad:analogY() < -sensitivity or pad:analogY() > sensitivity then
     cursor.y = cursor.y + pad:analogY()/(128/maxspeed)
end
end

function clock()
time = os.time()
timestring = os.date("%c",time)
timeinfo = os.date("*t", time)
hour = timeinfo.hour
if hour > 11 then ampm = "PM"
elseif hour < 12 then ampm = "AM"
end
min = timeinfo.min
if min < 10 then
min = "0" .. min
end
hour = timeinfo.hour
if hour > 12 then
hour = hour - 12
end
screen:print(325, 26,hour..":" ..min .. " "..ampm, white)
end

function collision(cursor,button1)
	return (cursor.x + cursor.w > button[1].x) and (cursor.x < button[1].x + button[1].w) and (cursor.y + cursor.h > button[1].y) and (cursor.y < button[1].y + button[1].h)
end

function button()
if pad:cross() and collision(cursor,button1) then 
dofile("fb.lua")
end
end

function screenPrint()
screen:blit(0,0,background)
screen:blit(21,234,fb)
screen:blit(113,234,mp)
screen:blit(210,234,apps)
screen:blit(305,234,games)
screen:blit(399,234,wb)
screen:blit(cursor.x,cursor.y,cursor.img)
screen:print(424,26, System.powerGetBatteryLifePercent(),white)
end

while true do
screen:clear()

collision(cursor,button1)

moveCursor()

button()

screenPrint()

clock()

screen.waitVblankStart()
screen.flip()
end

Hey guys i am having some problems with my code. On startup i encounter the following error that i cannot figure out how to fix: Error: main.lua:54: attempt to index global 'button' (a function value)

It is probably something stupid that i just overlooked but thanks for any help anyone gives.

[TacticalPenguin]

You made button a table and then made it a function. Need to change the names.

[Bob Hoil]

Thanks i knew it was something stupid i just noticed that.

[Hedzx]

Is there a way to check a line of text for a specific phrase, and replace it? or a way without replacing? for example:
i load a text file, and read a line off it, and if i see the word "lol" in that line, then replace it with the word omg
just an example^^

[Bob Hoil]

Awesome it works!!! Thanks a lot to everyone. Now i just need to make the other screens.

[Urameshi]

your welcome dude

[Bob Hoil]

I ma having problems with returning to the previous screen. Is there a way to load the last file info out of ram then use that to load the file?

[Hedzx]

can anyone help with my problem above? also, i searched on google and found a few functions like
string.find, string.sub, and string.gsub... what do these do? thanks for any help

[Anti-QuickJay]

can anyone help with my problem above? also, i searched on google and found a few functions like
string.find, string.sub, and string.gsub... what do these do? thanks for any help

Doesnt anyone go to lua.org anymore?

http://www.lua.org/manual/5.1/manual.html#5.4

[SG57]

Yeah, people do. Stupid question on your part...

Bob Hoil - What? Load the last info out of ram and use it to load the file... wtf... Try syllables and sentences and you may get your answer ;)