saving png as different file name if it exists

[raptrex]

for the base of my "paint" application, im using this script from the tutorial:

Code: Select all

red = Color.new(255, 0, 0);
black = Color.new(0, 0, 0);
white = Color.new(255, 255, 255);

canvas = Image.createEmpty(480, 272)
canvas:clear(white)

brush = {}
eraser = {}

x0 = 0
y0 = 0
x1 = 0
y1 = 0
while true do
	pad = Controls.read()
	dx = pad:analogX()
	if math.abs(dx) > 32 then
		x0 = x0 + dx / 64
	end
	dy = pad:analogY()
	if math.abs(dy) > 32 then
		y0 = y0 + dy / 64
	end
	if pad:cross() then
		canvas:drawLine(x0, y0, x1, y1, black)
	end
	x1 = x0
	y1 = y0
	screen:blit(0, 0, canvas, 0, 0, canvas:width(), canvas:height(), false)
	screen:drawLine(x1 - 5, y1, x1 + 5, y1, red)
	screen:drawLine(x1, y1 - 5, x1, y1 + 5, red)
	screen.waitVblankStart()
	screen.flip()
	if pad:start() then break end
	if pad:select() then screen:save("screenshot.png") end
end

with the use of png instead of tga

how would i do this?:

if screenshot.png exists, save image as screenshot1.png
if screenshot1.png exists, save image as screenshot2.png
ect ect ect

maybe to infinity and beyond
or 10 for now

[LuMo]

Code: Select all

function ScreenShot()
    name='screenshot_'
    counter=0
    extension='.png'
    while io.open(name..counter..extension, "r") do
        counter=counter+1
        io.close()
    end
    --reached a filename that does not exist.
    screen:save(name..counter..extension)
end

this code is untested, but i guess it should work.
plz post if it really works and if not, what happens (or report the fix)

greets
lumo

[raptrex]

it works perfectly THANK YOU!!!!
your my hero

[LuMo]

fine!
uploaded the lua-file to my webpage :)

greets

[paulieweb]

i tried both raptrex's original screenshot code from the tutorial and lumo's screenshot function, and neither saves a screenshot anywhere on my stick. when i hit the button, the memory stick light flashes like it's saving, but i can't find it. anybody else with this problem?

[chaos]

i tried both raptrex's original screenshot code from the tutorial and lumo's screenshot function, and neither saves a screenshot anywhere on my stick. when i hit the button, the memory stick light flashes like it's saving, but i can't find it. anybody else with this problem?

yeah.. don't use usb mode when taking screenshots, they won't show up.. and you can end up corrupting the memory stick, requiring a reformat.

[paulieweb]

whew, thanks a lot

[Master Inuyasha]

hey, something is wrong, i installed that into my script, and made it so that when you press pad, it takes a screenshot, but it doesnt work. Heres my code:

elseif pad:select() then
function ScreenShot()
name='ms0:/PSP/PHOTO/screenshot_'
counter=0
extension='.png'
while io.open(name..counter..extension, "r") do
counter=counter+1
io.close()
end
--reached a filename that does not exist.
screen:save(name..counter..extension)
end
end

says got nil calling global value