Lua Programming Help Thread

[Xsjado7]

im almost finished my little app and i fixed my problems no thanks to you guys :Argh: haha no hard feelings, i know i do seem like a noob but i do have a pretty good understanding of lua. just one question. when i overwrite a file in the flash it cuts the file from the memory stick instead of copying it. anyway to make it copy instead? thanks

[myschoo]

System.writeFile("path:/to/file","path:/to/destination", delete source file? "yes" or "no")

[Xsjado7]

haha it was write underneath my nose, i thought that meant overwrite if a file of the asme name is present. thanks myshoo

[Anti-QuickJay]

:ROFL:
lua is the easiest thing to learn when coding for psp

Depends. Some people can understand C/C++ better then Lua.

[andyauff]

Compiling my lua script will help improve speed, correct? If so, what should I use to compile it? I've tried the XtreamLua Compiler with no luck.

EDIT: Nevermind, I got the XtreamLua Compiler to work.

[LMelior]

hey everyone,
@LMelior: it didnt work but thanks for trying.

I did not "try" to fix it for you, because that's not a good way to help people. I was pointing out what was wrong. You moved your character (Exhibit A), then you set the "old" x and y positions to the current x and y positions (Exhibit B), and then checked for collision (Exhibit C). When the objects collide, you move the current x and y back to the old x and y, which - guess what - is exactly the same, thanks to your second step. So, like I said the first time, think about the order in which you do things.

Compiling my lua script will help improve speed, correct? If so, what should I use to compile it? I've tried the XtreamLua Compiler with no luck.

EDIT: Nevermind, I got the XtreamLua Compiler to work.

No, it doesn't improve execution speed. I think if you compile a file that you want to include with dofile or loadfile, then it speeds up the loading process, but if I recall correctly, that's the only speed benefit. Your best bet right now is to optimize your code. Once Luaplayer 0.21 is released though, the execution speed will be considerably better.

[andyauff]

No, it doesn't improve execution speed. I think if you compile a file that you want to include with dofile or loadfile, then it speeds up the loading process, but if I recall correctly, that's the only speed benefit. Your best bet right now is to optimize your code. Once Luaplayer 0.21 is released though, the execution speed will be considerably better.

I see. Thanks.

[placo23]

Hi guys, did anyone have any joy trying to use WLAN on Lua Player 0.20?

I've been trying to access a file on my server to get some specific data for a HB I'm developing at the moment, but it just hangs. I've found lots of workaround, but none of them seem to work.

I even thought I was doing something wrong, so I tried to run the WLAN code from the sample, which looks pretty much like what I developed, but it just hangs too.

Did anyone get this sample to work?

Cheers,

Marcos Placona

[KleptoOne]

Hi guys, did anyone have any joy trying to use WLAN on Lua Player 0.20?

I've been trying to access a file on my server to get some specific data for a HB I'm developing at the moment, but it just hangs. I've found lots of workaround, but none of them seem to work.

I even thought I was doing something wrong, so I tried to run the WLAN code from the sample, which looks pretty much like what I developed, but it just hangs too.

Did anyone get this sample to work?

Cheers,

Marcos Placona

Are you overclocking your psp? you have to keep the processor at default settings if you want to use wlan.

[placo23]

I've changed everything, but it still doesn't work. I've changed my clock to default, changed Wlan.useConnectionConfig( 1) to Wlan.useConnectionConfig( 2), changed the hard reset to enabled and nothing.

Does WLAN hava any problem with WPA?

cheers

[FaT3oYCG]

i think it only has basic encryption in lua so i think it might have problems with that

[Anti-QuickJay]

I believe it doesn't work with WPA. Because I was able to use WLAN on lua player .20.

[sony psp player]

Hi,

I wanted to know if you were able to use a configuration file in LUA (i know in C it works) and how I could make one. Also I need some help with coroutines, what they are and do.

-sony_psp_player

[EminentJonFrost]

Hi,

I wanted to know if you were able to use a configuration file in LUA (i know in C it works) and how I could make one. Also I need some help with coroutines, what they are and do.

-sony_psp_player

you mean a text file meant for the user to change settings on the comp? yea you can do that.

[sony psp player]

you mean a text file meant for the user to change settings on the comp? yea you can do that.

Change on computer and from PSP so it can save the current state of the app.

[placo23]

Yes, you can use config files normally. I use'em all the time.

Just incluide your config file to you script.

cheers

[sony psp player]

I've looked on google now (may should have done before) and i found this: for line in file:lines.
They said this function will iterate all over the file but it doesn't. It returnes every second line.

[placo23]

I've looked on google now (may should have done before) and i found this: for line in file:lines.
They said this function will iterate all over the file but it doesn't. It returnes every second line.

Ok, what are you trying to do? You don't need to read the file. If you want a config file, you can just set your variables into that file, and read the variables normally, as if it was an include. Know, if you wanna read specific bits of this file, you'll need to read it and iterate over the lines.

I don't have code samples here, but I can send'em to you later today.

Cheers

[sony psp player]

Ok, what are you trying to do? You don't need to read the file. If you want a config file, you can just set your variables into that file, and read the variables normally, as if it was an include. Know, if you wanna read specific bits of this file, you'll need to read it and iterate over the lines.

I don't have code samples here, but I can send'em to you later today.

Cheers

No, I need to set the variables, too.

[placo23]

No, I need to set the variables, too.

So it's easy. Just set whatever you need to set, and read'em

I think it's pretty straight forward. Unless I'm not getting your point here.

Do you wanna send me some piece of code telling exactly what you wanna do?

Cheers

[sony psp player]

So it's easy. Just set whatever you need to set, and read'em

I think it's pretty straight forward. Unless I'm not getting your point here.

Do you wanna send me some piece of code telling exactly what you wanna do?

Cheers

Here is a detailed description of my problems:

I want to save some information about the user, the position... in a file called "config.txt" so here are my problems:

1. for line in file:lines doesn't iterate all over the file, it reads only every second line.
2. i don't know how to add a new line to the file

[placo23]

Here's an example:

file = io.open("myFile.txt", "r")
	if file then
		for line in file:lines() do
			value = string.find(line, "userStatus=")
			
			if value then
				return value
			end
		end
	else
		screen:print(100,100,"Error opening file!",color)
	end

That should open the file and iterate over all the lines.

As per the append new line thingy, you can use

io.open (filename, "a")

Which will open the file in append mode.

Check the Lua Manual for more information

Hope it helps you.

Cheers

[placo23]

Here's an example:

file = io.open("myFile.txt", "r")
	if file then
		for line in file:lines() do
			value = string.find(line, "userStatus=")
			
			if value then
				return value
			end
		end
	else
		screen:print(100,100,"Error opening file!",color)
	end

That should open the file and iterate over all the lines.

As per the append new line thingy, you can use

io.open (filename, "a")

Which will open the file in append mode.

Check the Lua Manual for more information

Hope it helps you.

Cheers

[myschoo]

or you can use dofile

[placo23]

or you can use dofile

That will do too, but it ain't let him append to the file.

Cheers

[sony psp player]

Here's an example:

file = io.open("myFile.txt", "r")
	if file then
		for line in file:lines() do
			value = string.find(line, "userStatus=")
			
			if value then
				return value
			end
		end
	else
		screen:print(100,100,"Error opening file!",color)
	end

That should open the file and iterate over all the lines.

As per the append new line thingy, you can use

io.open (filename, "a")

Which will open the file in append mode.

Check the Lua Manual for more information

Hope it helps you.

Cheers

Thanks for the example! The for line in file:lines returns only every second line still, but i can leave the lines that are not returned out. Thanks!

[placo23]

Thanks for the example! The for line in file:lines returns only every second line still, but i can leave the lines that are not returned out. Thanks!

That's weird, 'cause I just tested here, and it returns me the whole file.

Well glad that you found out a way around to that.

Cheers

[eldiablov]

How would i go about pausing my main loop when start is pressed ?

[_dysfunctional]

Here's an example:

file = io.open("myFile.txt", "r")
    if file then
        for line in file:lines() do
            value = string.find(line, "userStatus=")
            
            if value then
                return value
            end
        end
    else
        screen:print(100,100,"Error opening file!",color)
    end

That should open the file and iterate over all the lines.

As per the append new line thingy, you can use

io.open (filename, "a")

Which will open the file in append mode.

Check the Lua Manual for more information

Hope it helps you.

Cheers

Generally, you should check for error, rather than success. It makes for neater, and easier to read code.

[sony psp player]

How would i go about pausing my main loop when start is pressed ?

if pad:start() then
	oldpad = pad
	while true do
		pad = Controls.read()
		if pad:start() and not oldpad:start() then
			break
		end
		oldpad = pad
	end
end