gnusmas

Hello there. I want that the actual altitude of my aircraft is written to a line in a txt file, and the file should be permanently updated. So i've changed the "record to csv.lua" file into like this -- "Record to CSV" example data logging LUA plug-in, by Pete Dowson, September 2008 -- Open an exisitng "FSrecord.csv" file to append to, or create it if it doesn't exist -- It will go into the Modules folder because I've not included a full path (like "C:\....") -- By using "assert" you get an error message if this fails f = assert(io.open("alt.txt","w")) -- note the elapsed mSecs count now so can provide relative mSec timing column time0 = ipc.elapsedtime() -- Loop until our Flag 0 is set (by assigned FSUIPC control) while not ipc.testflag(0) do -- Set the timestamp for this loop time = ipc.elapsedtime() - time0 -- Read all the data we want from FSUIPC lat, lon, alt, pitch, bank, hdgT = ipc.readStruct(0x0560,"3DD", "2SD", "1UD") -- now convert them all from FS units into those we normally recognise alt = alt * 3.28084 / (65536 * 65536) -- but only log this time IF we aren't in an FS menu, or loading scenery -- (check the "ready-to-fly" flag word at 3364) -- and provided we are not paused (flagged at 0264) if (ipc.readUW(0x3364) == 0) and (ipc.readUW(0x0264) == 0) then -- write a CSV line to the open file f:write(string.format("%.1f\n", alt)) end -- 20 times per second, roughly (allow 2 mSecs overhead) ipc.sleep(48) end -- tidy up at end ... f:write("\n") f:close() -- end of example program This works perfectly fine... But now the output in the "alt.txt" is for example: 21.8 21.8 21.8 21.8 21.8 21.8 21.8 21.8 21.8 21.8 21.8 21.8 21.8 i want just one line that should be updated, and not a ton of new lines. is there a way to manage this? and where should i change the script to let it do this? thanks :)