Lua Navigational Scripting...

Hey Guys,

I'm sitting now about 2 days at a stretch on lua-scripting, and I'm finally at a point where I've nearly given up hope.

I try to export the longi- and latitudal position of the player aircraft. After around 8 hours and two tacview-export-lua-examinations, I figured out it must be something with the CurrentObjectData-table(?). But whenever I try to get data from this table - for example, with the simple expression 'io.write(CurrentObjectData.Heading)', I end up with an error in the log "attempt to index global `CurrentObjectData' (a nil value)". Why the hell is this a nul value? How is that table structured? And - how do I access tables in the export script? I tried many ways, for example like I would access an indexed array (CurrentObjectData.Heading[0] and things like that), but I ended up running in circles. Is there any documentation available to the Lock On-Export-tables, or how I can access them?

Please!

Tired greetings from Germany,

Hag

Hi, in my case I've done something similar in order to get the Coordinates when a ONLINE player ejects. (I'm making a kind of online data exporter so in a future I can do some dynamic campaign in PHP)

I hope that it help, also it would be fine if you tell what file you're coding (events.lua, export.lua, etc etc)

And don't give it up, I've wasted 2 full weeks in order to get something usefull ;)

That's coded in the events.lua:

function on_eject(id)

report(_("%s ejected."), player_info(id))

eject(id)

end

local function eject(id)

local runtimeId = get_player_runtime_id(id)

io.write(string.format("id=%s pilot=%s coords=%s side=%s EJECT\n",

runtimeId, get_player_name(id), get_unit_coordinates(runtimeId), get_player_side(id)))

end

local function get_player_runtime_id(networkId)

missionId = get_player_mission_id(networkId)

if missionId == nil or missionId == "" then

return -1

end

runtimeId, ok = net.dostring_in("mission", "return db.clients.red["..missionId.."].ID")

if ok and runtimeId ~= "" then

return runtimeId

end

runtimeId, ok = net.dostring_in("mission", "return db.clients.blue["..missionId.."].ID")

if ok and runtimeId ~= "" then

return runtimeId

end

return -1

end

local function get_unit_latitude(runtimeId)

latitude, ok = net.dostring_in("export", "local o = LoGetWorldObjects() return o["..runtimeId.."].LatLongAlt.Lat")

if ok and latitude ~= "" then

return latitude

end

return -1

end

local function get_unit_longitude(rundimeId)

longitude, ok = net.dostring_in("export", "local o = LoGetWorldObjects() return o["..runtimeId.."].LatLongAlt.Long")

if ok and longitude ~= "" then

return longitude

end

return -1

end

local function get_unit_coordinates(runtimeId)

if runtimeId == nil or runtimeId == "" then

return -1

end

return get_unit_latitude(runtimeId).."//"..get_unit_longitude(rundimeId)

end

local function get_player_mission_id(networkId)

if players[networkId].unit ~= nil then

return players[networkId].unit

end

return nil

end

Uh, I frickeled some time, but... the events.lua does only exist in DCS, proove me wrong? Trying anyway to work along. Can you or someone explain how to access the tables which seem to contain the actual data?

dynamic campaign in php? persistant battlefield you say?

I have some concepts lying around if you are interested. I guess you are trying to do something like europeinruins.com or similar?

Hello Haggart,

Sorry for this late answer, I was in vacation.

Tacview export script is very specific and was refined over years, that's why it is not easy to understand. To get a better view of Lock-On export capabilities, you should come back to the roots: export.lua which contains few by commented and understandable lists of useful LUA functions.

If you need to only export player's aircraft position you should use the following two functions (from lock-on):

First, use LoGetPlayerPlaneId() to get player aircraft ID (if any).

Then use LoGetObjectById() to get player aircraft information:

That way you will get latitude, longitude and altitude for the player's aircraft.

If you also need player's aircraft orientation you can use:

I hope this answer your question.

Hey, any news? :)