Type Function Library io.* Return value Object Revision 2018.3321 Keywords io, tmp, temporary file, file See also io.read() io.open()
Opens a temporary file for reading and writing and returns a handle to it. When the app ends normally, this file will be deleted.
Note that calling this function creates an empty file. Use the
file:seek() function to reset the position in the file for reading back the data. The data will be lost if you close and call
io.tmpfile() to open it again.
io.tmpfile() seems to always return
nil on Android, since Android OS discourages the use of this function for both sandboxing and partition space issues.
local fh = io.tmpfile() -- Create an empty temporary file fh:write( "My temporary file data" ) fh:flush() -- Ensure data written to file print( "file position: ", fh:seek() ) fh:seek( "set", 0 ) -- Reset file position local content = fh:read( "*a" ) -- Read all the file print( "File content: " .. content )