callback in facebook calls

arcadia · October 2013

Hi,
I have made a function to do REST call to my home-made service:
this is the function

function platform_call(func,params,callback)
 
	local headers = {
	["Authorization"] = "Basic",
	["Content-Type"]  = "application/x-www-form-urlencoded",
	}
 
	local method = UrlLoader.POST
	local body = params
	local url = "<a href="http://192.168.1.10:8080/sta/index.php/"..func" rel="nofollow">http://192.168.1.10:8080/sta/index.php/"..func</a>
 
 
	local loader = UrlLoader.new(url, method, headers, body)
 
	local function onComplete(event)
		local h = Json.Decode(event.data)
		if h==nil then h={} end
		if callback then callback(h) end
	end
 
	local function onError()
		spinner:close()
		local alertDialog = AlertDialog.new("Error", "Network error!", "Ok")
		alertDialog:show()
	end
 
	loader:addEventListener(Event.COMPLETE, onComplete)
	loader:addEventListener(Event.ERROR, onError)
	end

so i can call a REST api with a callback in this way:

platform_call("challenge/getChallenges","player="..gameSaved.user,
		function(response)
			if response.success then
				print("TOTALE DUELLI "..table.getn(response.challenges))
				spinner:close()
			else
				print("errore"..response.error)
			end
 
			spinner:close()
		end)

But how can I make my own function to have a callback when i do a facebook call? I have a global object "facebook" and a global event REQUEST_COMPLETE...:

        require ("facebook")
 
	facebook:setAppId("xxx");
	facebook:authorize();
       facebook:graphRequest("xxx/scores")
       facebook:addEventListener(Event.REQUEST_COMPLETE, function(e)
       etc etc etc
      end)

ar2rsawseen · October 2013

I'm sorry but I don't really understand what you mean

for facebook event Event.REQUEST_COMPLETE is already a callback, where you can make any call where ever you want.

arcadia · October 2013

My idea is to use facebook to do a leaderboard and show friends score but facebook function score don't return the pictures too. So for each friends i have to call graphRequest(userid/picture) to download and show The picture( this is what i nave understood correct me if is wrong).
So i need multiple async calls all with its own callback. My idea is to do a UserPicture class and in The init do The rest call And so download And show The picture but with a inique global callback i can't know what picture i m downloading...
Damn android keyboard sorry for The english.

ar2rsawseen · October 2013

aha, I see.
Yes this is the limitation of Facebook SDK we are using (actually I have not checked if the same is on the Facebook 3.0 SDK or not)
For now, only solution seems to be to get the images one by one.
Request first one, retrieve it in REQUEST_COMPLETE, and request next one there.
That way you would always know which one's image you are currently requesting.

arcadia · October 2013

OK thx i will try

arcadia · October 2013

I discovered that i can download the profile pictures just with an url without use a graphRequest api call.

this is the url:
https://graph.facebook.com/USER_ID/picture

but that url do a redirect to the effective picture and so if i use the standard UrlLoader to save the picture i can't know the image extention.

local out = io.open("|D|"..item.fid..".jpg", "wb")
out:write(event.data)
out:close()
local b = Bitmap.new(Texture.new("|D|"..item.fid..".jpg"))
 
 
that code crash if the image is a gif (for example the default facebook picture)

ar2rsawseen · October 2013

same way you can call: https://graph.facebook.com/USER_ID/picture?redirect=false through UrlLoader to see what type of image it is (jpg or gif) and then download it

But thats actually strange because many folks are saying that api only returns jpg photos and I have seen many developers rely on it.

But you are right, it does seem to return gif and even png for some images

arcadia · October 2013

ok i first checked the extension file but....with the jpg files i have no problem...with the .gif i have this error:

|D|100006740888771.gif: Image format is not supported.

The file exist, but i can't show.
GIF are not supported??

this is the image url
https://fbcdn-profile-a.akamaihd.net/static-ak/rsrc.php/v2/yo/r/UlIqmHJn-SK.gif

ar2rsawseen · October 2013

ah, yes, unfortunately gif are not supported, as there may be multiple frames, etc

if only anonymous photos are gif, you can use pre converted ready jpg image

if others images also can be gif, then maybe you would need something like this:
http://ittner.github.io/lua-gd/manual.html

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