Unity Null Reference Error

Questions & Answers
1

Hello,

I have a unity script (posted below) that connects to a php file which then checks the username and password against a database. However, everytime we click the login button, we get a nullreference error on line 49 which is loginform.addfield

Any help would be greatly appreciated. I have posted both unity code and php code.

using UnityEngine;
using System.Collections;

public class Login : MonoBehaviour {

 public Texture LoginBackground;
 public Texture2D stylebackground;
 public GUIStyle LoginStyle;
 public GUIStyle LoginTextBox;
 public GUIStyle LoginButton;
 public string Username;
 public string Password;
 public float transparent;
 private string url;
 public WWW w;
 public WWWForm loginform;
 // Use this for initialization
 void Start () {
 LoginStyle.fontSize = 72;
 LoginStyle.alignment = TextAnchor.MiddleCenter;
 LoginTextBox.fontSize = 20;
 LoginTextBox.alignment = TextAnchor.MiddleCenter;
 LoginTextBox.normal.background = stylebackground;
 LoginButton.fontSize = 30;
 LoginButton.alignment = TextAnchor.MiddleCenter;
 url = "http://redlightlife.tk/scripts/checklogin.php";
 }
 
 // Update is called once per frame
 void Update () {
 
 }
 
 void OnGUI() {
 GUI.backgroundColor = Color.black;
 GUI.DrawTexture(new Rect(0,0,Screen.width,Screen.height),LoginBackground,ScaleMode.StretchToFill, false, 0.0f);
 GUI.Label(new Rect(Screen.width/2-250,Screen.height/2-250,500,250),"Username:", LoginStyle);
 Username = GUI.TextField(new Rect(Screen.width/2-250,Screen.height/2-80,500,50), Username, 10, LoginTextBox);
 GUI.Label(new Rect(Screen.width/2-250,Screen.height/2-50,500,250),"Password:", LoginStyle);
 Password = GUI.TextField(new Rect(Screen.width/2-250,Screen.height/2+120,500,50), Password, 10, LoginTextBox);
 if (GUI.Button(new Rect(Screen.width/2-150,Screen.height/2+200,300,50),"Login:", LoginButton))
 {
 CheckLogin();
 }
 }
 
 void CheckLogin()
 {
 loginform.AddField("username", Username);
 loginform.AddField("password", Password);
 w = new WWW(url,loginform);
 Debug.Log("Downloaded");
 if (w.error != null)
 {
 print(w.error);
 }
 else
 {
 print("Login Okay");
 string formText = w.text;
 w.Dispose();
 Debug.Log(formText);
 }
 }
}

 <?php 
 function main($formUse = true)
 {
$link = mysql_connect('bondsolutionsnjcom.fatcowmysql.com', 'lightswitch', '*password*'); 
if (!$link) { 
    die('Could not connect: ' . mysql_error()); 
} 
echo 'Connected successfully'; 
mysql_select_db(red_light_life_accounts1);

// This could be supplied by a user, for example
$username;
$password;

if(!$username || !$password) {

    echo "Login or password cant be empty.";

} else {

    $SQL = "SELECT username,password FROM accounts WHERE username = '" . $username . "' & password = '" . $password . '"';

        $result_id = @mysql_query($SQL) or die("DATABASE ERROR!");

        $total = mysql_num_rows($result_id);

        if($total) {

            $datas = @mysql_fetch_array($result_id);

            if(!strcmp($pass, $datas["password"])) {

                echo "Success";

            } else {

                echo "Username or password is wrong.";

            }

        } else {

            echo "Data invalid - cant find username.";

        }

    }
 }

// Close mySQL Connection
 
mysql_close();
?>
2

Nowhere do you say loginForm = new WWWForm();