How to get the file size and delete file in Lua?
Solution 1
The size is given by myFile:seek("end")
.
To delete the file, use os.remove(path)
. But close the file first.
Solution 2
Recently Lua File System support was added to Corona! You can get file size using
local lfs = require "lfs"
local size = lfs.attributes (path, "size")
You can have a read here http://keplerproject.github.com/luafilesystem/manual.html#reference
To delete the file use
os.remove(path)
gadss
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Updated on July 21, 2022Comments
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gadss almost 2 years
I have problem in getting the size of the file using Lua. I am creating a function method that if the file size of the file is
743 bytes
, then the file will be deleted.Here is my code :
local getDLFile = function(fileToDL) local path = system.pathForFile(fileToDL, system.DocumentsDirectory ) local myFile = io.open( path, "w+b" ) http.request{ url = "http://www.testfile.com/"..fileToDL, sink = ltn12.sink.file(myFile), } -- i don't know what is the syntax if myFile.size == 743 bytes then myFile.delete end end
Can anyone can help me about my case?
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gadss almost 12 yearsthanks lhf for your answer, i try to
print(myFile:seek("end"))
but i god these error in my coronaRuntime error ...ne\my documents\singing idol final game\freeplay.lua:258: attempt to use a closed file stack traceback: [C]: ? [C]: in function 'seek' ...ne\my documents\singing idol final game\freeplay.lua:258: in function 'getDLFile' ...ne\my d
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lhf almost 12 years@gadss, it seems that you're closing the file before seeking when you should close it after seeking.
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AnthumChris about 4 years@lhf Is it necessary to seek file to previous position before
seek("end")
or does that have no impact for one-off file size getting?