Lua Programming Help Thread

[Anti-QuickJay]

Try to indent and put spaces...That way your code is much neater to look at and better organization..

[SG57]

Yes, loading another file via dofile(".lua") will stop all scripts besides what you just loaded... Meaning you have to have some sort of loop to keep that script from reaching the bottom...

[yaustar]

Yes, loading another file via dofile(".lua") will stop all scripts besides what you just loaded... Meaning you have to have some sort of loop to keep that script from reaching the bottom...

No it doesn't, it runs the script you just loaded inside the script that you called it from. Using dofile recklessly (ie circlar dofiles) will lead to internal memory leaks and stack overflows.

[mbr7]

I need help i wanne know how to change the current direction
like if the current direction is MS0:NewMap/
and i want to change it to MS0:NewMap/stuff/
-= Double Post =-

No it doesn't, it runs the script you just loaded inside the script that you called it from. Using dofile recklessly (ie circlar dofiles) will lead to internal memory leaks and stack overflows.

is that dangerous ? because i am working on a software and i have dozen of dofiles like when i click start menu dofile startmenu when i click it down dofile desktop.

[Cheez Pirate]

So I take it SG57 is wrong and a new loop in each file is not the way to go?

No it doesn't, it runs the script you just loaded inside the script that you called it from. Using dofile recklessly (ie circlar dofiles) will lead to internal memory leaks and stack overflows.

Is this dangerous? Should I put all my code in one file?

EDIT: Off-topic: Is the X360 Gamercard avatar for the forums for premium members only? Coz mine isn't showin.

[yaustar]

Bottom line, if you use dofile, make sure you use then correctly. For those C/C++ coders out there, you are essentially calling a function in a function. If those functions never end, then the variables on the stack don't get cleared up and overflow.

To check if your app will have this problem, he is an exercise to do. Scan you 'root' file. Replace all the dofiles calls with the contents of the files that you are calling. Once you have done that you should have one file with the contents of other files in it. Do the same thing again until there are no more dofile calls. If you find that you never stop doing this, then you have a problem and you can see why.

[EminentJonFrost]

how about if the script that has the dofile merely loads variables and functions? would it be 'dangerous' then?

[GuitarGod1134]

Dofiles arent bad its ok if your using them to load stuff or go to a new area or something but only when they are nessceary (lol spelling). Just dont overdue it like

--my app
--colors
dofile
--pics
dofile
--fonts
dofile
while true do
--main loop and functions
dofile
end
--flip and stuff
dofile

just dont over due it.

[TacticalPenguin]

I need help i wanne know how to change the current direction
like if the current direction is MS0:NewMap/
and i want to change it to MS0:NewMap/stuff/
-= Double Post =-


is that dangerous ? because i am working on a software and i have dozen of dofiles like when i click start menu dofile startmenu when i click it down dofile desktop.

Changing the current directory is easy.

Say we're in a directory called "dir" and it contains a folder called "dir2"

System.currentDirectory(" ./dir2")

Then to goup a directory:

System.currentDirectory(" ./..")

And for more directory functions, check the lua examples snippets etc thread at the bottom is a filebrowser snippet I wrote.

[Anti-QuickJay]

Dofiles arent bad its ok if your using them to load stuff or go to a new area or something but only when they are nessceary (lol spelling). Just dont overdue it like

--my app
--colors
dofile
--pics
dofile
--fonts
dofile
while true do
--main loop and functions
dofile
end
--flip and stuff
dofile

just dont over due it.

I only use dofile's to load a menu or options, Evrything else is inside one script, I really dont like to put more than 3 dofiles in a single script.
XBOX360 AVATAR: You need to have a regular avatar loaded first.

[MSeven]

is it possible to overclock a psp in lua. so when the game starts it sets the psp to 333 mhz automatically

[Anti-QuickJay]

You need cools lua player mod.

[Yongobongo]

333 mhz is the max anyway, you can also use the systemext or something lrx y be2003 on ps2dev

[Anti-QuickJay]

Nevermind, In his release thread he said he removed the overclocking function cause it can be dangerous if you dont use it right.

[EminentJonFrost]

well...I use it and it works fine. (cools' mod 2)
i just set the cpu speed to 333 in the beginning and at the end i set it back to 222. everything's worked normal, as expected.

[Cheez Pirate]

You've failed to answer my main question. How do you keep a image from disapearing after 1 frame? Dark_Merlins way doesn't work.

[Anti-QuickJay]

You've failed to answer my main question. How do you keep a image from disapearing after 1 frame? Dark_Merlins way doesn't work.

Why dont you find out? You cant expect to come here and ask a million questions and hope someone answers it.

[EminentJonFrost]

You've failed to answer my main question. How do you keep a image from disapearing after 1 frame? Dark_Merlins way doesn't work.

well...i dont know what your code is but you could set a variable for it like this:

imageblitted = false
...
while true do
...
...
if something then
imageblitted = true
end
...
...
if imageblitted = true then
screen:blit(x, y, image)
end
...
...
end

that should give you a basic concept. :)

[Cheez Pirate]

well...i dont know what your code is but you could set a variable for it like this:

imageblitted = false
...
while true do
...
...
if something then
imageblitted = true
end
...
...
if imageblitted = true then
screen:blit(x, y, image)
end
...
...
end

that should give you a basic concept. :)

That's understandable. Thanks.

And to pspgamer81. I always try to find out before I post.

[Anti-QuickJay]

That's understandable. Thanks.

And to pspgamer81. I always try to find out before I post.

You can try a little bit harder than, I was like this before, I didnt know anything, But once you sit down, Go over the functions, Understand the code, Then you wont need to be coming here alot.

[SG57]

Cheez_Pirate - Dont mind pspgamer. He's just a little social butterfly... Loves to post, not saying what he says is 100% true... He's even hypicritical at times, like just there... Funny how he doesnt want you posting a zillion questions/problems where he is already half way to a zillion... Maybe he doesnt like competition ;)

And honestly, just learn the game programming theory, or if your still struggling with the whole 'programming concept' then make small demos and read tutorials. Once you get those 2 down, nothings stopping you from making a game in any language, as long as your willing to learn that languages syntax... Oh and if that machine allows arbitrary code to be ran :X

[Grimfate126]

You can try a little bit harder than, I was like this before, I didnt know anything, But once you sit down, Go over the functions, Understand the code, Then you wont need to be coming here alot.

lol, i wouldnt be talking. im not even sure if YOU understand the code.

OT:

you sig text makes no sense. you cant die in hell, dont you have to be dead to even get there?

[Anti-QuickJay]

Nope, You can be alive.
Lets get back on topic.

[xmOD]

hey i asked my ques in another thread sometime back when someone told me to post my question in this thread instead.. so here it is..

My question is.. Say for example i have a file containing many lines of text/code... Now what i want to do is when i press the button 'x' then the screen should show the text which is on the offset 0x0002DE0 , how can i do this?

when i use the file:seek("set",0x0002DE0 ) [suggested by youresam] then it prints 11744 on the screen but i dont want that as the output.. i want it to print the value at that offset in the file it has opened..
for example, there is a file called hello.reg in which at the offset 0x0002DE0 the value 1111 is stored, so when it opens the file, i want it to show the value 1111 instead of 11744 .. now some of you may say that instead of using 0x0002DEO i should use 0xF to show 1111 but that value is dynamic, if i change 1111 to 2222 then it should show that value at the offset 0x0002DE0 ..

i dont know if you understood what i mean to say but thats what i mean :-) .. also if this is not possible then how can i open up a file in hex mode on the psp using lua? if i can open the file in hex mode then i may be able to pick up from there to do the function i want it to do..

[Dark_Merlin]

>_< Can someone help me with my code, it is really slow and the fps meter shows 0 all the time.

Heres the files http://upload.team-duck.com/users/Da...0Espionage.rar

[Cheez Pirate]

I've updated my code a little. Now when I press X on menustatus = 1 it will go to the singleplayer1 menu. I want it to go back to the main menu when triangle is pressed. It won't work. I want to go to singleplayer2 menu when X is pressed in singleplayer1 menu. It won't work.

When I try to load multiplayer by pressing X on menustatus = 2 it says the image could not be found. Returned as boolean. But I checked the paths and filenames like 10 times and it's all right but it won't load the multiplayer1 menu.

        white = Color.new(255,255,255)
                menustatus = 1
                         singleplayer1 = false
                      singleplayer2 = false
                      multiplayer1 = false
              menu1 = Image.load("images/menu1.png")
              cursor1 = Image.load("images/cursor1.png")
              multiplayer1 = Image.load("images/multiplayer1.png")
              singleplayer1 = Image.load("images/singleplayer1.png")
              singleplayer2 = Image.load("images/singleplayer2.png")
oldpad = Controls.read()
       while true do
pad = Controls.read()
screen:clear(white)
screen:blit(0,0,menu1)
            if menustatus == 1 then
               screen:blit(280,172,cursor1)
end
            if menustatus == 2 then
               screen:blit(280,196,cursor1)
end
            if pad:down() and oldpad:down() ~= pad:down() then
               menustatus = menustatus + 1
end
            if pad:up() and oldpad:up() ~= pad:up() then
               menustatus = menustatus - 1
end
            if menustatus == 0 then
               menustatus = 1
end
            if menustatus == 3 then
               menustatus = 2
end
--singleplayer1
            if pad:cross() and menustatus == 1 then
               singleplayer = true
end
            if singleplayer == true then
               screen:clear(white)
               screen:blit(0,0,singleplayer1)
end
            if singleplayer1 == true and pad:cross() then
               singleplayer2 = true
               singleplayer1 = false
end
            if pad:triangle() and singleplayer1 == true then
               singleplayer1 = false
end
--singleplayer2
            if singleplayer2 == true then
                 screen:clear(white)
                 screen:blit(0,0,singleplayer2)
end
            if pad:triangle() and singleplayer2 == true then
                 singleplayer2 = false
end
--multiplayer1
            if pad:cross() and menustatus == 2 then
                 multiplayer1 = true
end
            if multiplayer1 == true then
                 screen:clear(white)
                 screen:blit(0,0,multiplayer1)
end
            if pad:triangle() and multiplayer1 == true then
                 multiplayer1 = false
end
--reloading main menu
            if singleplayer1 == false or multiplayer1 == false and singleplayer2 == false then
                 screen:clear(white)
                 screen:blit(0,0,menu1)
end
--reloading singleplayer1 menu
            if singleplayer2 == false and menu1 == false then
                 screen:clear(white)
                 screen:blit(0,0,singleplayer1)
end
screen.waitVblankStart()
screen.flip()
oldpad = pad
end

[MasterChief117]

i was wondering how to delete a directory and ALL its files, like deleting "/psp/game/mygame/temp/" then "*.*"
-= Double Post =-
i tried

System.removeFile("*.*")

Didn't work

[yotop456]

I have a huge problem i really need help in. I am making a app that requires alot of animation and many of my animation use up to 100 frames. I am using the anilib V.4, and al my frames are in jpg format. here are my problems

1. trieng to use .png images give me a "cannot load image" error
2. the animation will work fine if less than 30 frames, but if its over 30 my program freeezes.




this is really holding me back if any one has any advice it would be greatly appreciated

[yaustar]

I have a huge problem i really need help in. I am making a app that requires alot of animation and many of my animation use up to 100 frames. I am using the anilib V.4, and al my frames are in jpg format. here are my problems

1. trieng to use .png images give me a "cannot load image" error
2. the animation will work fine if less than 30 frames, but if its over 30 my program freeezes.




this is really holding me back if any one has any advice it would be greatly appreciated

Write your own or extend animlib to unload any animation frame images that are not being used from memory and load the frames that you need next or only load the images you need for the current frame. It be relatively slow but you have no choice since you are running out of memory.

Why on earth would you need 100 frames for an animation any way?

[EminentJonFrost]

i'll help out some, cheez pirate.

first off, theres alot of 'if' statements that can be cleaned up...too little time over here to type explanations. i'll just fix it up for you for now.

take a look at this and see if you see an error that will obviously give you some trouble later on:

singleplayer1 = false
singleplayer2 = false
singleplayer1 = Image.load("images/singleplayer1.png")
singleplayer2 = Image.load("images/singleplayer2.png")

white = Color.new(255,255,255)
menustatus = 1
singleplayer1 = false
singleplayer2 = false
multiplayer1 = false
menu1 = Image.load("images/menu1.png")
cursor1 = Image.load("images/cursor1.png")
multiplayer1 = Image.load("images/multiplayer1.png")
singleplayer1image = Image.load("images/singleplayer1.png")
singleplayer2image = Image.load("images/singleplayer2.png")

--better than oldpad
upPressed = false
downPressed = false
leftPressed = false
rightPressed = false
crossPressed = false
squarePressed = false
trianglePressed = false
circlePressed = false

while true do

	pad = Controls.read()

	screen:clear(white)
	screen:blit(0,0,menu1)

	if menustatus == 1 then
          	     screen:blit(280,172,cursor1)
	elseif menustatus == 2 then
               	screen:blit(280,196,cursor1)
	end

	if pad:down() then
		if downPressed == false then
			menustatus = menustatus + 1
			if menustatus > 2 then
				menustatus = 2
			end
			downPressed = true
		end
	else
		downPressed = false
	end

	if pad:up() then
		if upPressed == false then
			menustatus = menustatus - 1
			if menustatus < 1 then
				menustatus = 1
			end
			upPressed = true
		end
	else
		upPressed = false
	end

	--singleplayer1
	if pad:cross() then
		if crossPressed == false then
			if menustatus == 1 and singleplayer1 == false then
				singleplayer = true
			elseif menustatus == 1 and singleplayer1 == true then
				singleplayer2 = true
				singleplayer1 = false
			elseif menustatus == 2 and multiplayer1 == false then
				multiplayer1 = true
			end
			crossPressed = true
		end
	else
		crossPressed = false
	end

	if pad:triangle() then
		if singleplayer1 == true then
			singleplayer1 = false
		end
		if singleplayer2 == true then
			singleplayer2 = false
		end
		if multiplayer1 == true then
			multiplayer1 = false
		end
	end

	if singleplayer1 == true then
           	    screen:blit(0,0,singleplayer1image)
	end

	if singleplayer2 == true then
              	   screen:blit(0,0,singleplayer2image)
	end

	if multiplayer1 == true then
             	    screen:blit(0,0,multiplayer1)
	end

	screen.waitVblankStart()
	screen.flip()
end

i'm tired.
this is what i was able to do in a few minutes. you'll see some things are missing. sorry about that. but you should be able to figure it out from there. gotta sleep. hope this helped. :)
night!