9 replies to this topic

[minebuild02]

I am writing a new program for my OS. It needs to read a file, convert the data to a table and read this table to ensure that a file name is inside the file. I don't know how to do steps 1-2. Can anyone help me?

EDIT: I will now explain this program. It will register/unregister files as Assemblies (APIs). Also it will list existing Assemblies and recover the most recent backup of System Assembly Cache (libs.index). I need it for my OS.

Edited by minebuild02, 16 April 2015 - 04:55 PM.

[KingofGamesYami]

For files, use the fs api. I don't know why you'd want to change the string returned into a table, given that there's the string.find function...

local file = fs.open( "FileToRead", "r" ) --#open the file in read mode
local data = file.readAll() --#data now contains the contents of "FileToRead"
file.close() --#always close file handles
if string.find( data, "ThingToFind" ) then
  --#aha, it's there
else
  --#nope, it's not
end

[Creator]

as for converting the data to a table do this:

local TableYouNeed = textutils.unserialize(data)

cheers

[minebuild02]

KingofGamesYami, on 14 April 2015 - 01:13 PM, said:

For files, use the fs api. I don't know why you'd want to change the string returned into a table, given that there's the string.find function...

local file = fs.open( "FileToRead", "r" ) --#open the file in read mode
local data = file.readAll() --#data now contains the contents of "FileToRead"
file.close() --#always close file handles
if string.find( data, "ThingToFind" ) then
  --#aha, it's there
else
  --#nope, it's not
end

Will try to use!

[minebuild02]

Now I've got another problem: How do I remove a string from the file?

[Creator]

open the file in read mode, save content to string, remove whatever is annoying you, open file in write mode, and writethe data to it. If you want I could help you with some code.

[KingofGamesYami]

It may be worth reading through This thread.

[minebuild02]

KingofGamesYami, on 14 April 2015 - 02:02 PM, said:

It may be worth reading through This thread.

Thanks

[H4X0RZ]

you could also do this

local afterItGotRemoved = string.replace(beforeItGotRemoved,whatToRemove," ")

[KingofGamesYami]

Nope, no string.replace function. Perhaps you meant string.gsub?