problem wtih save data in a textfile

[espace3d]

hi,

i have this problem when i save my number of level in a textfile my function start don’t work and an another thing is that the terminal output of my corona simulator restarts when i save my data in my textfile…

local path = system.pathForFile( "myfile.txt", system.RessourceDirectory ) local file = io.open( path, "r" ) var = file:read( "\*a" ) io.close( file ) file = nil local cntLevel=tonumber(var) local function upgrade() cntLevel=cntLevel+1 if cntLevel \>= #level then print("you have finished the game…hourra!") cntLevel = #level else --save data in text file saveData = cntLevel file = io.open( path, "w" ) file:write( saveData ) io.close( file ) file = nil flagupgradelevel=true local function startLevel() print("start") end timer.performWithDelay(2000,startLevel) end end --result nothing and my terminal output restart but the file is correctly saved

by against when i don’t save my data my function works

local function upgrade() cntLevel=cntLevel+1 if cntLevel \>= #level then print("you have finished the game…hourra!") cntLevel = #level else local function startLevel() print("start") end timer.performWithDelay(2000,startLevel) end end --result : start

what’s the problem with this function yet I followed the documentation…

thanks for your help

[espace3d]

solved. By better reading the documentation

This is important because, for security reasons, you can not write/save data to system.ResourceDirectory.

so with

local path = system.pathForFile( "myfile.txt", system.DocumentsDirectory )

no problem! The file myfile.txt must be created and located via Corona simulator>show project Sandbox

[espace3d]

I still have a problem when i publish my application on android it’s seems that myfile.txt or my DocumentsDirectory is not recognize in the phone…

/Users/jenkins/slaveroot/workspace/Templates/label/android/subrepos/composer/composer.lua:1460:X\...\game/lua:35:attempt to index local 'file' (a nil value)

why? 

[undecode]

Why are you niling file?

local path = system.pathForFile( "myfile.txt", system.RessourceDirectory ) local file = io.open( path, "r" ) var = file:read( "\*a" ) io.close( file ) file = nil

[espace3d]

hi undecode,

i have simply followed the documentation

https://docs.coronalabs.com/guide/data/readWriteFiles/index.html

like you i don’t understand why they put file = nil

i have tried with uncomment these lines in my application

> in corona simulator : no problem my app works (it’was also the case before without uncomment these lines)

> in my android phone : i have no more error but i have a blackscreen and nothing appears …

exactly the same problem with an another android phone.

i don’t understand why…if you could help me…

[rob]

You nil file because it contains more than a simple variable, so it takes up a little bit of memory. Nilling it out frees that little bit of memory up.

As for your problem, you can’t call file:read() if the file doesn’t exist. When you run your app the first time, if your file doesn’t exist, then you create a file for future use:

local path = system.pathForFile( "myfile.txt", system.DocumentsDirectory ) local file = io.open( path, "r" ) if file then -- the file exists     var = file:read( "\*a" )     io.close( file )     file = nil else -- file doesn't exist:      file = io.open( path, "w" )      local startingLevel = 1      file:write( startingLevel )      io.close( file )      var = startingLevel end

Rob

or something like that…

[espace3d]

hi Rob,

i believed that the files in the sandbox directory were copied with the app during the build… Now it works. TKY

[espace3d]

solved. By better reading the documentation

This is important because, for security reasons, you can not write/save data to system.ResourceDirectory.

so with

local path = system.pathForFile( "myfile.txt", system.DocumentsDirectory )

no problem! The file myfile.txt must be created and located via Corona simulator>show project Sandbox

[espace3d]

I still have a problem when i publish my application on android it’s seems that myfile.txt or my DocumentsDirectory is not recognize in the phone…

/Users/jenkins/slaveroot/workspace/Templates/label/android/subrepos/composer/composer.lua:1460:X\...\game/lua:35:attempt to index local 'file' (a nil value)

why? 

[undecode]

Why are you niling file?

local path = system.pathForFile( "myfile.txt", system.RessourceDirectory ) local file = io.open( path, "r" ) var = file:read( "\*a" ) io.close( file ) file = nil

[espace3d]

hi undecode,

i have simply followed the documentation

https://docs.coronalabs.com/guide/data/readWriteFiles/index.html

like you i don’t understand why they put file = nil

i have tried with uncomment these lines in my application

> in corona simulator : no problem my app works (it’was also the case before without uncomment these lines)

> in my android phone : i have no more error but i have a blackscreen and nothing appears …

exactly the same problem with an another android phone.

i don’t understand why…if you could help me…

[rob]

You nil file because it contains more than a simple variable, so it takes up a little bit of memory. Nilling it out frees that little bit of memory up.

As for your problem, you can’t call file:read() if the file doesn’t exist. When you run your app the first time, if your file doesn’t exist, then you create a file for future use:

local path = system.pathForFile( "myfile.txt", system.DocumentsDirectory ) local file = io.open( path, "r" ) if file then -- the file exists     var = file:read( "\*a" )     io.close( file )     file = nil else -- file doesn't exist:      file = io.open( path, "w" )      local startingLevel = 1      file:write( startingLevel )      io.close( file )      var = startingLevel end

Rob

or something like that…

[espace3d]

hi Rob,

i believed that the files in the sandbox directory were copied with the app during the build… Now it works. TKY