Lua Programming Help Thread

[natan333]

SG57
Now what could it be wrong this time ? Lua player load my index with out any error but with the eboot and changing system.lua to load mine it gives error, it dosent load my index but it dose load airhockey index
i added the luasplash and and comp.wav to my index it loads but when its time to load the program it gives error ???? and with luaplayer it dosent ?????? am i missing a code?

[montrob]

Hey what does this error mean?

stack overflow

[Raven_lif]

hey guys,

what im trying to do is create a moving allow/launcher for a homebrew game.

i loaded the image, then i want it to move to the left when you press up.
so this is the code i used

--[[
launcher  loaded in default position)
]]

screen:blit(20,98,launcher7)
screen:flip()

pad = Controls.read()

if pad:cross() then break end
end

if pad:up() then
launcher7.clear()
screen:blit(20,98,launcher6)
screen:flip()

the problem i have is when you press up - the original launcher/arrow doesnt clear - so you cant see the second launcher (which is slightly aimed more towards the left)

can anyone help me with this
or
is there an easier way of moving the laucher/arrow

thanks for all your help

RL

{Edit}

so now i got it to do something - by moving the "end" after
if pad:cross() then break end
but i get the error

image:clear([color]) zero or one arguement

[TPTaylor]

Hey what does this error mean?

stack overflow

I think it means something could not be found like a file maybe? But i'm only guessing here!

[natan333]

aaaa donno what is wrong but i m rebuiding the paint program again
learning this things is almost making me downgrade again >.< and i dont feal comfortable doing it =/

[TPTaylor]

hey guys,

what im trying to do is create a moving allow/launcher for a homebrew game.

i loaded the image, then i want it to move to the left when you press up.
so this is the code i used

--[[
launcher  loaded in default position)
]]

screen:blit(20,98,launcher7)
screen:flip()

pad = Controls.read()

if pad:cross() then break end
end

if pad:up() then
launcher7.clear()
screen:blit(20,98,launcher6)
screen:flip()

the problem i have is when you press up - the original launcher/arrow doesnt clear - so you cant see the second launcher (which is slightly aimed more towards the left)

can anyone help me with this
or
is there an easier way of moving the laucher/arrow

thanks for all your help

RL

{Edit}

so now i got it to do something - by moving the "end" after
if pad:cross() then break end
but i get the error

You have described launcher6 and 7 haven't you, it's just it doesn't say it there.oh, is that the image, i guess it is.
How about adding waitVblankstart() or something?

[Grimfate126]

hey guys,

what im trying to do is create a moving allow/launcher for a homebrew game.

i loaded the image, then i want it to move to the left when you press up.
so this is the code i used

--[[
launcher  loaded in default position)
]]

screen:blit(20,98,launcher7)
screen:flip()

pad = Controls.read()

if pad:cross() then break end
end

if pad:up() then
launcher7.clear()
screen:blit(20,98,launcher6)
screen:flip()

the problem i have is when you press up - the original launcher/arrow doesnt clear - so you cant see the second launcher (which is slightly aimed more towards the left)

can anyone help me with this
or
is there an easier way of moving the laucher/arrow

thanks for all your help

RL

{Edit}

so now i got it to do something - by moving the "end" after
if pad:cross() then break end
but i get the error

are u even ALLOWED to do launch7.claer()??

[natan333]

usbin = System.usbDiskModeActivate

while true do
screen:clear()
pad = Controls.read()

if pad:l() then usbin = true
end

if pad:select() then
break
end

screen.flip()
screen.waitVblankStart()
end

this is just an example. there are more codes in
Guys i put into the script. but usb dosnt show up. how can I make it work ?
( i have firmware 2.0 though)

[Raven_lif]

yes i defined launcher6 and 7 amognst others

ill try
waitVblankstart()
but doesnt that make the screen pause?

are u even ALLOWED to do launch7.claer()??

well i assume so - its just a code to clear the image isn't it? launch7 being the image

but anyway it doesnt work - because it just dies and gives the error i mentioned

[EminentJonFrost]

Hello all, can someone help me with this code? For some reason, when I try to run it on the PC, it creates a luaplayer.exe.stackdump file. The code:

 

red=Color.new(255,0,0)
green=Color.new(0,255,0)
blue=Color.new(0,0,255)
white=Color.new(255,255,255)

duh=Image.load("duh.png")
counter=Timer.new()
counter:start()
screen:blit(50,50,"duh.png")
while true do
pad=Controls.read()

if pad:up() then
duh.y=duh.y + 2
end

if pad:down() then
duh.y=duh.y - 2
end

if pad:right() then
duh.x=duh.x + 2
end

if pad:left() then
duh.x=duh.x - 2
end

currentTime=counter:time()
screen:clear(blue)
screen:print(10,10,"Counter Time: " .. currentTime, white)

if currentTime > 2500 and currentTime < 5000 then
screen:clear(red)
end

if currentTime > 5001 then
counter:reset(0)
counter:start()
end

screen.waitVblankStart()
screen.flip()
end

When the stackdump is opened with notepad, its:

Stack trace:
Frame     Function  Args
  49774 [sig] luaplayer 2112 handle_threadlist_exception: handle_threadlist_exception called with threadlist_ix -1
  75965 [sig] luaplayer 2112 handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
Exception: STATUS_ACCESS_VIOLATION at eip=61015E82
eax=7C802542 ebx=610E7ECC ecx=00000000 edx=0000001B esi=00000000 edi=00000001
ebp=00A2E6E8 esp=00A2E6E4 program=C:\Documents and Settings\FattyMcFat\Desktop\luaplayerwindows\luaplayer.exe, pid 2112, thread sig
cs=001B ds=0023 es=0023 fs=003B gs=0000 ss=0023
Stack trace:
Frame     Function  Args
00A2E6E8  61015E82  (610E7ECC, 0022E598, 00000001, 00000000)
00A2E708  61015FAC  (00000001, 00A2E760, 00000000, 00000000)
00A2EA58  610179AB  (000006F4, 00A2EED0, 000000A4, 00A2EE9C)
00A2EF98  6108A497  (610E6D18, 00000000, 00000F84, 00000000)
00A2EFC8  6100327F  (610E6D18, 00A2F000, 61003160, 00000000)
00A2EFF8  61003E94  (00000000, 00000000, 00000000, 00000000)
00A2FF98  61003EDA  (00000000, 00000000, 00000000, 00000000)
End of stack trace

Can someone help? And thanks in advance!

You need spaces between the "=" signs for all variables.

example

What you have:
black=Color.new(0, 0, 0)

Should be:
black = Color.new(0, 0, 0) <--space out the words from the equal (=) sign.

[natan333]

guys wasnt this supposed to work ?. already put CursorsDimensionY and X before while true do

if letterPosy < 0 then letterPosy = 0
	 else if letterPosy > 272 - CursorsDimensionY then letterPosy = 272 - CursorsDimensionY
	 else if letterPosx < 0 then letterPosx = 0
	 else if letterPosx > 480 - CursorsDimensionX then 480 - CursorsDimensionX
	 end
end

[EminentJonFrost]

yes i defined launcher6 and 7 amognst others

ill try
waitVblankstart()
but doesnt that make the screen pause?



well i assume so - its just a code to clear the image isn't it? launch7 being the image

but anyway it doesnt work - because it just dies and gives the error i mentioned

yes. thats what "screen.waitVblankStart() " does. it stops the screen at leaving whatever is blitted right where it is for eternity, unless its used in a "while true do" loop.

--[[
launcher  loaded in default position)
]]

screen:blit(20,98,launche  r7)
screen:flip() <-- whats this here for? I only see a need for one "screen.flip()", and thats placed at the bottom of the script just before "screen.waitVblanStart()".

pad = Controls.read()

if pad:cross() then break end
end

if pad:up() then
launcher7.clear()
screen:blit(20,98,launche  r6)
screen:flip()
end

you missed an "end" for that last "if" loop.

[EminentJonFrost]

guys wasnt this supposed to work ?. already put CursorsDimensionY and X before while true do

if letterPosy < 0 then letterPosy = 0
	 else if letterPosy > 272 - CursorsDimensionY then letterPosy = 272 - CursorsDimensionY
	 else if letterPosx < 0 then letterPosx = 0
	 else if letterPosx > 480 - CursorsDimensionX then 480 - CursorsDimensionX
	 end
end

only one "end" is necessary.

thats whats good about using "elseif".

[EminentJonFrost]

damn...I just realized I'm making too many posts..oh well.

if pad:up() then
launcher7.clear() -- just use a normal "screen.clear()"
screen:blit(20,98,launche    r6)
screen:flip()
end

[Raven_lif]

you missed an "end" for that last "if" loop.

the end is there was just on the next line down

screen:blit(20,98,launche r7)
screen:flip() <-- whats this here for? I only see a need for one "screen.flip()", and thats placed at the bottom of the script just before "screen.waitVblanStar t

becuase its loading ht elauncher - as well as some other images - that i dont have a problem with - which is why they are not included in the code

also a screen:clear()
doesnt do anything

oh........god

[EminentJonFrost]

the end is there was just on the next line down


becuase its loading ht elauncher - as well as some other images - that i dont have a problem with - which is why they are not included in the code

ah.

i think you should post a little more coding next time around so people avoid confusion.

[Raven_lif]

XD..... sorry

[PSPduh]

Thanks EminentJonFrost, but it still creates a stackdump file. I spaced out everything that was cramped on the equal sign; the new code:

red = Color.new(255,0,0)
green = Color.new(0,255,0)
blue = Color.new(0,0,255)
white = Color.new(255,255,255)

duh = Image.load("duh.png")
counter = Timer.new()
counter:start()
screen:blit(50,50,duh)
while true do
pad = Controls.read()

if pad:up() then
duh.y = duh.y + 2
end

if pad:down() then
duh.y = duh.y - 2
end

if pad:right() then
duh.x = duh.x + 2
end

if pad:left() then
duh.x = duh.x - 2
end

currentTime = counter:time()
screen:clear(blue)
screen:print(10,10,"Counter Time: " .. currentTime, white)

if currentTime > 2500 and currentTime < 5000 then
screen:clear(red)
end

if currentTime > 5001 then
counter:reset(0)
counter:start()
end

And the stackdump file: (not sure if it changed)

Stack trace:
Frame     Function  Args
7C8107FD  7C81084D  (32000000, 907C83AB, 90909090, FC489D39)
 322869 [sig] luaplayer 2956 handle_threadlist_exception: handle_threadlist_exception called with threadlist_ix -1
 339374 [sig] luaplayer 2956 handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
Exception: STATUS_ACCESS_VIOLATION at eip=61015E82
eax=00FFFFFF ebx=610E7ECC ecx=00000000 edx=FF001CC6 esi=00000001 edi=00000001
ebp=00A2E6E8 esp=00A2E6E4 program=C:\Documents and Settings\FattyMcFat\Desktop\luaplayerwindows\luaplayer.exe, pid 2956, thread sig
cs=001B ds=0023 es=0023 fs=003B gs=0000 ss=0023
Stack trace:
Frame     Function  Args
00A2E6E8  61015E82  (610E7ECC, 6110BA74, FC489D39, 00000000)
00A2E708  61015FAC  (00000001, 00A2E760, 00000000, 00000000)
00A2EA58  610179AB  (000006F4, 00A2EED0, 000000A4, 00A2EE9C)
00A2EF98  6108A497  (610E6D18, 00000000, 00000F84, 00000000)
00A2EFC8  6100327F  (610E6D18, 00A2F000, 61003160, 00000000)
00A2EFF8  61003E94  (00000000, 00000000, 00000000, 00000000)
00A2FF98  61003EDA  (00000000, 00000000, 00000000, 00000000)
End of stack trace

Thanks in advance!

[natan333]

hmm. that code was wrong for me
the code bellow worked with me like a charm =PP

if letterPosy < 2 then letterPosy = 2 end
if letterPosy > 269 then letterPosy = 269 end
if letterPosx < 2 then letterPosx = 2 end
if letterPosx > 477 then letterPosx = 477 end

Anyways, i dont know how will be for users bellow 2.0, is the lua windows eboot have a home button included ?
and How can i take screenshot like

if pad:l() and pad:triangle() then screen:save("PortablePaint.tga") end

but to go to the root of the memory stick ?
and by making it to change to portablepaint to like portablepaint02 if i pres l trigger and triangle twice and so on?

[SG57]

SG57
Now what could it be wrong this time ? Lua player load my index with out any error but with the eboot and changing system.lua to load mine it gives error, it dosent load my index but it dose load airhockey index
i added the luasplash and and comp.wav to my index it loads but when its time to load the program it gives error ???? and with luaplayer it dosent ?????? am i missing a code?

omg... Just look at the structure of the app and how it is loaded. Then replace it with your structurea dn stuff

[EminentJonFrost]

Thanks EminentJonFrost, but it still creates a stackdump file. I spaced out everything that was cramped on the equal sign; the new code:

red = Color.new(255,0,0)
green = Color.new(0,255,0)
blue = Color.new(0,0,255)
white = Color.new(255,255,255)

duh = Image.load("duh.png")
counter = Timer.new()
counter:start()
screen:blit(50,50,duh)
while true do
pad = Controls.read()

if pad:up() then
duh.y = duh.y + 2
end

if pad:down() then
duh.y = duh.y - 2
end

if pad:right() then
duh.x = duh.x + 2
end

if pad:left() then
duh.x = duh.x - 2
end

currentTime = counter:time()
screen:clear(blue)
screen:print(10,10,"Counter Time: " .. currentTime, white)

if currentTime > 2500 and currentTime < 5000 then
screen:clear(red)
end

if currentTime > 5001 then
counter:reset(0)
counter:start()
end

And the stackdump file: (not sure if it changed)

Stack trace:
Frame     Function  Args
7C8107FD  7C81084D  (32000000, 907C83AB, 90909090, FC489D39)
 322869 [sig] luaplayer 2956 handle_threadlist_excepti  on: handle_threadlist_excepti  on called with threadlist_ix -1
 339374 [sig] luaplayer 2956 handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
Exception: STATUS_ACCESS_VIOLATION at eip=61015E82
eax=00FFFFFF ebx=610E7ECC ecx=00000000 edx=FF001CC6 esi=00000001 edi=00000001
ebp=00A2E6E8 esp=00A2E6E4 program=C:\Documents and Settings\FattyMcFat\Deskt  op\luaplayerwindows\luapl  ayer.exe, pid 2956, thread sig
cs=001B ds=0023 es=0023 fs=003B gs=0000 ss=0023
Stack trace:
Frame     Function  Args
00A2E6E8  61015E82  (610E7ECC, 6110BA74, FC489D39, 00000000)
00A2E708  61015FAC  (00000001, 00A2E760, 00000000, 00000000)
00A2EA58  610179AB  (000006F4, 00A2EED0, 000000A4, 00A2EE9C)
00A2EF98  6108A497  (610E6D18, 00000000, 00000F84, 00000000)
00A2EFC8  6100327F  (610E6D18, 00A2F000, 61003160, 00000000)
00A2EFF8  61003E94  (00000000, 00000000, 00000000, 00000000)
00A2FF98  61003EDA  (00000000, 00000000, 00000000, 00000000)
End of stack trace

Thanks in advance!

hmm..I'm not sure. But my guess is that you change this:

screen:print(10,10,"Counter Time: " .. currentTime, white)

To This:

screen:print(10, 10, currentTime, white)

see if that works.

[PopcOrn DeVil]

It'll only print the word currentTime.

[Grimfate126]

It'll only print the word currentTime.

here: try this:

red = Color.new(255,0,0)
green = Color.new(0,255,0)
blue = Color.new(0,0,255)
white = Color.new(255,255,255)

duhx = 50
duhy = 50

duh = Image.load("duh.png")
counter = Timer.new()

while true do

screen:clear(blue)

pad = Controls.read()

screen:blit(duhx,duhy,duh)

if pad:up() then
duhy = duhy - 2
end

if pad:down() then
duhy = duhy + 2
end

if pad:right() then
duhx = duhx + 2
end

if pad:left() then
duhx = duhx - 2
end

currentTime = counter:time()
screen:print(10,10,"Counter Time: " .. currentTime, white)

if currentTime > 2500 and currentTime < 5000 then
screen:clear(red)
end

if currentTime > 5001 then
counter:reset()
counter:start()
end

screen.waitVblankStart()
screen.flip()
end

problems in your original code:

1.whenever you print OR blit something to the screen: it MUST be done inside a function, or a loop. you blitted "duh" in neither, so it appeared for only a bit, and then cleared.

2. at the end of your loop, you stated screen:clear(blue), and then printed the time. when you cleared, you ALSO cleared the picture, so it only showed you the time.

3. you did not give duhx and duhy a value. how is luaplayer supposed to know?

4. you did not end your loop.

5. there were more, but im too lazy right now.

bb! and good luck!

EDIT: @ EminentJonFrost, you DO NOT need spaces between your ='s, <'s, or >',s. although they do make your code easier to read.

[PSPMillionaire]

that wont work, but only for one simple reason. the screen:clear(red) near the bottom of the loop will clear the whole screen on top of the print command and the duh image, leaving a blank red screen until it goes back to blue.

Doing ALL your screen clearing at the top is a better approach, try this one.

red = Color.new(255,0,0)
green = Color.new(0,255,0)
blue = Color.new(0,0,255)
white = Color.new(255,255,255)

duhx = 50
duhy = 50

duh = Image.load("duh.png")
counter = Timer.new()

while true do

currentTime = counter:time()

if currentTime > 2500 and currentTime < 5000 then
screen:clear(red)
else
screen:clear(blue)
end

pad = Controls.read()

screen:blit(duhx,duhy,duh  )

if pad:up() then
duhy = duhy - 2
end

if pad:down() then
duhy = duhy + 2
end

if pad:right() then
duhx = duhx + 2
end

if pad:left() then
duhx = duhx - 2
end


screen:print(10,10,"Counter Time: " .. currentTime, white)



if currentTime > 5001 then
counter:reset()
counter:start()
end

screen.waitVblankStart()
screen.flip()
end

[natan333]

I have an question: how can i make trigger R to do multiple, Triple Things like an example below

if pad:r() and screen:blit(3,0, color) then screen:blit(3,50, color)
end

But i get error =/

[montrob]

I have an question: how can i make trigger R to do multiple, Triple Things like an example below

if pad:r() and screen:blit(3,0, color) then screen:blit(3,50, color)
end

But i get error =/

try this

if pad:r() then 
screen:blit(3,0, color) and screen:blit(3,50, color)
end
end

[PSPMillionaire]

I have an question: how can i make trigger R to do multiple, Triple Things like an example below

if pad:r() and screen:blit(3,0, color) then screen:blit(3,50, color)
end

But i get error =/

Yeah, that definitely would cause an error ;)
What exactly do you want it to do?

If you want to blit 2 images at once in one if statement then do this:

if pad:r() then
screen:blit(3,0, color)
screen:blit(3,50,color)
end

There is not limit how many lines you can put in there.

[natan333]

thx so much.
Now there is only one thing that i really need to learn for further releases and etc's
The code bellow is part of the script

if pad:cross() then
		canvas:drawLine(letterPosx, letterPosy, x1, y1, black)
	end
	x1 = letterPosx
	y1 = letterPosy
	screen:blit(0, 0, canvas, 0, 0, canvas:width(), canvas:height(), false)




screen:blit(letterPosx,letterPosy, arrow)
---------------------------------------------------
if pad:r() then screen:blit(3,0, color) end
if pad:r() and pad:square() then 
if letterPosx >= 4 and letterPosx <= 16 and letterPosy >= 19 and letterPosy <= 30 then
canvas:drawLine(letterPosx, letterPosy, x1, y1, red)
end
end

I dont know if you really going to get it.

You can see that Holding Cross and moving the arrows will have black pixels.
The Code above the ----- line is the default color of the paint (Black).
The code bellow the ---- line is what i m trying to change the black pixel to become red. The thing i want to make it work is to hold R trigger to pop up an image of a bunch of colors then select the color and press square button to activate it to change black to the color that is selected.
The code bellow

letterPosx >= 4 and letterPosx <= 16 and letterPosy >= 19 and letterPosy <= 30

is showing the red color position. so when i press square in that place, it will change black pixels to red so then i can unhold R trigger and square and press Cross and move arround with red color .

Can anyone help me with this one ?

[PSPduh]

Thanks everybody for helping me! What I did to fix the code was I used the Image.createEmpty instead of loading the image. Then I put the 0 in counter:reset(0). Now it works like I want it to. Thanks!

[PopcOrn DeVil]

here: try this:

red = Color.new(255,0,0)
green = Color.new(0,255,0)
blue = Color.new(0,0,255)
white = Color.new(255,255,255)

duhx = 50
duhy = 50

duh = Image.load("duh.png")
counter = Timer.new()

while true do

screen:clear(blue)

pad = Controls.read()

screen:blit(duhx,duhy,duh)

if pad:up() then
duhy = duhy - 2
end

if pad:down() then
duhy = duhy + 2
end

if pad:right() then
duhx = duhx + 2
end

if pad:left() then
duhx = duhx - 2
end

currentTime = counter:time()
screen:print(10,10,"Counter Time: " .. currentTime, white)

if currentTime > 2500 and currentTime < 5000 then
screen:clear(red)
end

if currentTime > 5001 then
counter:reset()
counter:start()
end

screen.waitVblankStart()
screen.flip()
end

problems in your original code:

1.whenever you print OR blit something to the screen: it MUST be done inside a function, or a loop. you blitted "duh" in neither, so it appeared for only a bit, and then cleared.

2. at the end of your loop, you stated screen:clear(blue), and then printed the time. when you cleared, you ALSO cleared the picture, so it only showed you the time.

3. you did not give duhx and duhy a value. how is luaplayer supposed to know?

4. you did not end your loop.

5. there were more, but im too lazy right now.

bb! and good luck!

EDIT: @ EminentJonFrost, you DO NOT need spaces between your ='s, <'s, or >',s. although they do make your code easier to read.

Uhm it wasn't me who needed help. I was just saying that what he wrote will just display currentTime.