Redirection to another lua page after downloading?

loves_oi · August 2012

I built a login page using Mathz's code. If the user enters correct username and password , then user's name is written on the simulator, if not it says "Wrong username or password" . Everything is Okay until here. But i want to redirect the user to another page if he enters correct username and password. How can i do it?
This is main.lua

	local keyboard = KeyBoard.new("en_GB")
	keyboard:Create()
 
	local label1 = TextField.new(nil,"Username : ")
	label1:setPosition(40, 45)
	label1:setTextColor(0xFF1300)
	stage:addChild(label1)
 
	local label2 = TextField.new(nil,"Password")
	label2:setPosition(40, 100)
	label2:setTextColor(0xFF1300)
	stage:addChild(label2)
 
	local inputbox = InputBox.new(150,20,150,40)
	inputbox:setText("")
	inputbox:SetKeyBoard(keyboard)
	inputbox:setBoxColors(0xefefef,0xff2222,0,1)
	inputbox:setActiveBoxColors(0xff5555,0xff2222,0,1)
	stage:addChild(inputbox)
 
	local inputbox2 = InputBox.new(150,80,150,40)
	inputbox2:setText("")
	inputbox2:SetKeyBoard(keyboard)
	inputbox2:setBoxColors(0xefefef,0xff2222,0,1)
	inputbox2:setActiveBoxColors(0xff5555,0xff2222,0,1)
	stage:addChild(inputbox2)
 
 
	stage:addChild(keyboard)
 
local a = TextField.new(nil,"Loading")
 
local upp = Bitmap.new(Texture.new("button.png"))
local down = Bitmap.new(Texture.new("application lifecycle.png"))
 
-- create the button
local button = Button.new(upp, down)
button:setPosition(200, 120)
stage:addChild(button)
nameTaken = ""
local click = 0
button:addEventListener("click", 
	function() 
		if inputbox:getText() == "test" then
			inputbox:setText("done")
		else
			nameTaken = inputbox:getText()
			passwordTaken = inputbox2:getText()
			print (nameTaken)
			print (passwordTaken)
 
			print (nameTaken .. "---")
 
			local loader = UrlLoader.new("<a href="http://localhost/checklogin.php?myusername=&quot" rel="nofollow">http://localhost/checklogin.php?myusername=&quot</a>; .. nameTaken .. "&mypassword=" .. passwordTaken)
 
			local function onComplete(event)
 
				local myString=event.data      -- We got the string here.
 
				local length = string.len(myString)
				local i = 1
 
				local echoString = ""
				while (i < length+1) do
 
					echoString = echoString .. string.sub(myString,i,i)
					i = i+1;
				end
 
				a:setText(echoString)
				a:setPosition(10, 185)
				a:setTextColor(0x007B25)
				stage:addChild(a)
 
				print (echoString)
 
				loader:removeEventListener(Event.COMPLETE, onComplete)
			end
 
			local function onError()
				print("error")
			end
 
			local function onProgress(event)
				print("progress: " .. event.bytesLoaded .. " of " .. event.bytesTotal)
			end
			loader:addEventListener(Event.COMPLETE, onComplete)
			loader:addEventListener(Event.ERROR, onError)
			loader:addEventListener(Event.PROGRESS, onProgress)
		end	
 
	end) --end of function which exist in button:addEventListener

checklogin.php

 
<?php
session_start();
$host="localhost"; // Host name 
$username=""; // Mysql username 
$password=""; // Mysql password 
$db_name="test"; // Database name 
$tbl_name="members"; // Table name
 
// Connect to server and select database.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");
 
// username and password sent from form 
$myusername=$_GET['myusername']; 
$mypassword=$_GET['mypassword']; 
 
// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);
 
// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
 
// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1){
 
// Register $myusername, $mypassword and redirect to file "login_success.php"
$_SESSION['myusername'] = $myusername;
$_SESSION['mypassword'] = $mypassword;
echo "Welcome Mr. " . $myusername ;
//session_register("myusername");
//session_register("mypassword"); 
//header("location:login_success.php");
 
}
else {
echo "Wrong Username or Password";
}
?>

Thanks in advance.

techdojo · August 2012

I would just send back a string containing the name of the screen you want to go to and then in your response function simply do a string compare against known values and then jump to the appropriate screen.

A good scene manager class is useful here - have a look at the game template example to see what I mean.

Simples

loves_oi · August 2012

I didn't understand what you mean . I've uploaded the screenshots.
After logging successfully , for example , i want user.lua page to open on the simulator.

for what reason should i use "Scenemanager class " . What can i do with it? I looked at "Scenemanager class" but i can't find what it can do for me

zvardin · August 2012

I think you are looking at the problem too much like a web solution. In this case, you don't need a new page, you need a new "scene". All that matters is what is drawn on the screen currently. The Scene Manager class makes it easy to switch between scenes, so you could have a "Login" scene and a "Home" screen for when they are logged in.

techdojo · August 2012

Exactly - think of each scene as a different "page", you have some high level control logic that displays the correct "page" (a scene / page is usually derived from a Gideros Sprite) (ie the Scene manager class - if the scene manager is a sprite, then each page is usually associated with a sprite and you set the corresponding sprite to be visible (and all others invisible) to show the current page).

When your app starts the login "page" is active, then when you get a response from the server you can decide to change to the home "page" by sending a message to the scene / page manager.

ar2rsawseen · August 2012

@loves_oi
you can check out GameTemplate
http://appcodingeasy.com/Gideros-Mobile/Gideros-Mobile-Game-Template
To see an example how SceneManager is used

techdojo · August 2012

That's the module I was referring to initially

loves_oi · August 2012

i'm studying the Game Template example and scenemanager.lua but it's so complex and difficult to understand for me.There are many classes and files in Game Template. And in scenemanager.lua there exist functions such as moveFromRight,moveFromLeft,overFromRight,overFromLeft,moveFromRightWithFade,moveFromLeftWithFade,overFromRightWithFade,overFromLeftWithFade,moveFromBottom,moveFromTop,overFromBottom,overFromTop,moveFromBottomWithFade,moveFromTopWithFade,overFromBottomWithFade ....
I have no idea about all these files . It so complex for beginners

I'm trying to simplify it and deleting some classes or some functions but it breaks.
This circumstance discourages me so much.I can't do anything. Please help

petec · August 2012

I'd start by looking at http://www.giderosmobile.com/blog/2011/11/17/gideros-scene-manager/ for more description of SceneManager and its transitions. You can download the example and play with that to find out what it does and then try altering some of the transitions to see what happens. Nothing beats having a good play when trying to get the hang of things!

ar2rsawseen · August 2012

Also maybe this will be of use:
http://appcodingeasy.com/Gideros-Mobile/Manage-Scenes-in-Gideros-Mobile

loves_oi · August 2012

OK . I carefully looked at these codes which you suggest .Now i have an idea. When the user enters his username and password , if it is valid , i will post True to Lua page .I will put if statement and if it is true , it will direct to another page. These are only ideas now. I hope it works.

For today, i only want to redirect it to a scene page when it is admin .But it doesn't work.

this is main.lua:

 
		local keyboard = KeyBoard.new("en_GB")
	keyboard:Create()
 
	local label1 = TextField.new(nil,"Username : ")
	label1:setPosition(40, 45)
	label1:setTextColor(0xFF1300)
	stage:addChild(label1)
 
	local label2 = TextField.new(nil,"Password")
	label2:setPosition(40, 100)
	label2:setTextColor(0xFF1300)
	stage:addChild(label2)
 
	local inputbox = InputBox.new(150,20,150,40)
	inputbox:setText("")
	inputbox:SetKeyBoard(keyboard)
	inputbox:setBoxColors(0xefefef,0xff2222,0,1)
	inputbox:setActiveBoxColors(0xff5555,0xff2222,0,1)
	stage:addChild(inputbox)
 
	local inputbox2 = InputBox.new(150,80,150,40)
	inputbox2:setText("")
	inputbox2:SetKeyBoard(keyboard)
	inputbox2:setBoxColors(0xefefef,0xff2222,0,1)
	inputbox2:setActiveBoxColors(0xff5555,0xff2222,0,1)
	stage:addChild(inputbox2)
 
	--local scene = "scene1"
 
	stage:addChild(keyboard)
 
	local a = TextField.new(nil,"Loading")
 
	local upp = Bitmap.new(Texture.new("button.png"))
	local down = Bitmap.new(Texture.new("application lifecycle.png"))
 
	-- create the button
	local button = Button.new(upp, down)
	button:setPosition(200, 120)
	stage:addChild(button)
 
	nameTaken = ""
	local click = 0
 
	local sceneManager = SceneManager.new({
					["scene1"] = Scene1,	
				})
 
	local scenes = {"scene1"}
 
button:addEventListener("click", 
	function() 
		if inputbox:getText() == "test" then
			inputbox:setText("done")
		else
			nameTaken = inputbox:getText()
			passwordTaken = inputbox2:getText()
			print (nameTaken)
			print (passwordTaken)
 
			print (nameTaken .. "---")
 
			local loader = UrlLoader.new("<a href="http://localhost/checklogin.php?myusername=&quot" rel="nofollow">http://localhost/checklogin.php?myusername=&quot</a>; .. nameTaken .. "&mypassword=" .. passwordTaken)
 
			local function onComplete(event)
 
				local myString=event.data      -- We got the string here.
 
				local length = string.len(myString)
				local i = 1
 
				local echoString = ""
				while (i < length+1) do
 
					echoString = echoString .. string.sub(myString,i,i)
					i = i+1;
				end
 
				a:setText(echoString)
				a:setPosition(10, 185)
				a:setTextColor(0x007B25)
				stage:addChild(a)
 
				print (echoString)
 
				loader:removeEventListener(Event.COMPLETE, onComplete)
 
 
 
				if(nameTaken == 'admin') then
					local transition = transitions
					sceneManager:changeScene(scene1, 1, transition, easing.outQuadratic, { eventFilter={Event.MOUSE_DOWN} } ) 
					stage:addChild(sceneManager)
				end	
			end
 
			local function onError()
				print("error")
			end
 
			local function onProgress(event)
				print("progress: " .. event.bytesLoaded .. " of " .. event.bytesTotal)
			end
			loader:addEventListener(Event.COMPLETE, onComplete)
			loader:addEventListener(Event.ERROR, onError)
			loader:addEventListener(Event.PROGRESS, onProgress)
		end	
 
	end) --end of function which exist in button:addEventListener

ERROR IS :
scenemanager.lua:264: attempt to index field '?' (a nil value)
stack traceback:
scenemanager.lua:264: in function 'changeScene'
main.lua:92: in function

Thanks in advance

ar2rsawseen · August 2012

You should pass scene name as string:

sceneManager:changeScene("scene1", 1, transition, easing.outQuadratic, { eventFilter={Event.MOUSE_DOWN} } )

loves_oi · September 2012

ok . i edited it. But now , i'm taking the error when i submit the username and password :
scenemanager.lua:277: attempt to index field '?' (a nil value)
stack traceback:
scenemanager.lua:277: in function 'changeScene'
main.lua:94: in function

The lines 277-279 are:

277   self.scene2 = self.scenes[scene].new(options and options.userData)
278	self.scene2:setVisible(false)
279	self:addChild(self.scene2)

ar2rsawseen · September 2012

@loves_oi
well this error looks quite similar. Which transition do you use, maybe this transition requires to have 2 scenes (from and to)?

loves_oi · September 2012

@ar2rsawseen ; i don't know actualy. I got it from "Gideros Scene Manager Project". i have added the project.You can try it by submitting username 'a' .

loves_oi · September 2012

i have updated the file. Now i'm taking error:
scenemanager.lua:325: attempt to perform arithmetic on field 'duration' (a nil value)
stack traceback:
scenemanager.lua:325: in function
the line is:
325 local t = (self.duration == 0) and 1 or (self.time / self.duration)
reason is (self.time / self.duration)
because t is null.

t is null because duration is null.In function changeScene , duration is 1 at first call , but then it becomes Null.Why??

This is changeScene function:

 
function SceneManager:changeScene(scene, duration, transition, ease, options)
 
print ("b")
print (duration)
 
	self.eventFilter = options and options.eventFilter
 
	if self.tweening then
		print ("100")
		return
	end
		print ("200")
	if self.scene1 == nil then
		print ("300")
		self.scene1 = self.scenes[scene].new(options and options.userData)
		self:addChild(self.scene1)
		dispatchEvent(self, "transitionBegin")
		dispatchEvent(self.scene1, "enterBegin")
		dispatchEvent(self, "transitionEnd")
		dispatchEvent(self.scene1, "enterEnd")
		return
	end
		print ("400")
 
	print ("a")
	print (duration)
 
	self.duration = duration
	self.transition = transition
	self.ease = ease or defaultEase
 
	self.scene2 = self.scenes[scene].new(options and options.userData)
	self.scene2:setVisible(false)
	self:addChild(self.scene2)
 
	self.time = 0
	self.currentTimer = os.timer()
	self.tweening = true
end

This is result:

Welcome Mr. a
b
1
200
300
scene1 - enter begin
scene1 - enter end
b
nil
200
400
a
nil
scene1 - exit begin
scene1 - enter begin
scenemanager.lua:335: attempt to perform arithmetic on field 'duration' (a nil value)
stack traceback:
	scenemanager.lua:335: in function <scenemanager.lua:318>

Scouser · September 2012

@loves_oi: in your main.lua file @ line 89 you have this code

	if(nameTaken == 'a') then
		local transition = transitions
		sceneManager:changeScene("scene1", 1, transition, easing.outQuadratic, { eventFilter={Event.MOUSE_DOWN} } ) 
		stage:addChild(sceneManager)
		sceneManager:changeScene("scene1") -- This line is your problem. It isn't needed and is also missing parameters
	end

loves_oi · September 2012

Ok . In examples , texture is added to the self. But isn't it possible to add TextField to the page?When i tried it , It gives error..

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