Writing to file

ar2rsawseen

Hi,

I've tried using Save & load a table script but it didn't work, I've narrowed it down to this simple snippet which doesn't work:

file = io.open( "test.txt", "w" )
file:write("somestring")
io.close(file)

Basically anything I save to file is not saved there, even if file is not created, is created, is created and added to Gideros project. Do I miss something? Any permisions?

I'm running Windows 7 32bit with Gideros v2011.9 beta3

P.S Reading from files works

MikeHart

Try this:

f= io.open( "test.txt", "w" ) file:write("somestring") io.close(f)

There are actually some file:xxxxx commands in LUA.

http://www.lua.org/manual/5.1/

MikeHart

Ok, I read more in the net, and I am not so sure if that is right what I wrote. Atilim??

MikeHart

Specify the document folder with the file name. I think the resouce folder is used by default. There you can not write to.

ar2rsawseen

What do you mean by specify document folder?
How can I do that and would this folder be visible in mobile phone?

BTW: How can I style code when posting it here?

ar2rsawseen

I might be wrong, but it seems that file is same file handle returned by io object. meaning, they just used variable name file in LUA documentation, it's not an object by itself. But I might be wrong.

atilim

Hi all,

There are two types of file access in Lua. "Simple" and "Complete" I/O model. Complete I/O model have more control over I/O and also it's simple to use. Therefore, you can simply omit Simple I/O model and directly use Complete I/O model always. Here is a simple example of Complete I/O model:

local file1 = io.open("|D|text.txt", "w") --> open text.txt in documents directory to write file1:write("somestring") --> write a string file1:close() --> close the file   ---   local file2 = io.open("|D|text.txt", "r") --> open text.txt in documents directory to read local str = file2:read("*all") --> read whole file print(str) --> print the contents file2:close() --> close the file

You can read more here: http://www.lua.org/pil/21.html
Here is the documentation about file system of gideros: http://www.giderosmobile.com/documentation/file_system.html (but the examples in this document use Simple I/O model)

You can write your code inside this:
<pre lang="lua">
</pre>

ar2rsawseen

Works like a charm, thank you

myrain25

how to read file line by line?

OZApps

if you have my book "Learn Lua for iOS Game Development" you can see Chapter #3 that deals with file operations and on page 30 is the answer you are looking for

for line in io.lines(filename) do print(line) end