I am beginner in unity and I am having this problem as stated below...
This is loginmenu script which is edited from an asset on unity asset store.
//This script controls the UI in the Database Control (Free) demo scene
//It uses database control to login, register and send and recieve data
using UnityEngine;
using System; //allows string.Split to be used with SplitStringOptions.none
using System.Collections;
using DatabaseControl;//This line is always needed for any C# script using the database control requests. See PDF documentation for more information
//use 'import DatabaseControl;' if you are using JS
public class LoginMenu : MonoBehaviour
{
////These variables are set in the Inspector:
//they are enabled and disabled to show and hide the different parts of the UI
public GameObject login_object;
public GameObject register_object;
public GameObject loading_object;
//these are the login input fields:
public UnityEngine.UI.InputField input_login_username;
public UnityEngine.UI.InputField input_login_password;
//these are the register input fields:
public UnityEngine.UI.InputField input_register_username;
public UnityEngine.UI.InputField input_register_password;
public UnityEngine.UI.InputField input_register_confirmPassword;
//red error UI Texts:
public UnityEngine.UI.Text login_error;
public UnityEngine.UI.Text register_error;
////These variables cannot be set in the Inspector:
//the part of UI currently being shown
// 0 = login, 1 = register, 2 = logged in, 3 = loading
int part = 0;
//scene starts showing login
bool isDatabaseSetup = true;
void Start()
{
//this checks whether the database is setup. It is used to prevent errors for users who try to use the demos
//without having setup a database.
//You don't need to use this bool as it will work without it as long as the database has been setup
TextAsset datafile = Resources.Load("data") as TextAsset;
string[] splitdatafile = datafile.text.Split(new string[] { "-" }, StringSplitOptions.None);
if (splitdatafile[0] == "0")
{
isDatabaseSetup = false;
Debug.Log("These demos will not work out of the box. You need to setup a database first for it to work. Please read the Setup section of the PDF for more information");
}
else
{
isDatabaseSetup = true;
}
//sets error Texts string to blank
blankErrors();
}
void Update()
{
if (isDatabaseSetup == true)
{
//enables and disables the defferent objects to show correct part
if (part == 0)
{
login_object.gameObject.SetActive(true);
register_object.gameObject.SetActive(false);
loading_object.gameObject.SetActive(false);
}
if (part == 1)
{
login_object.gameObject.SetActive(false);
register_object.gameObject.SetActive(true);
loading_object.gameObject.SetActive(false);
}
if (part == 2)
{
// We are logged in - We have already transitioned to a new scene... Hopefully!
}
if (part == 3)
{
login_object.gameObject.SetActive(false);
register_object.gameObject.SetActive(false);
loading_object.gameObject.SetActive(true);
}
}
}
void blankErrors()
{
//blanks all error texts when part is changed e.g. login > Register
login_error.text = "";
register_error.text = "";
}
public void login_Register_Button()
{ //called when the 'Register' button on the login part is pressed
part = 1; //show register UI
blankErrors();
}
public void register_Back_Button()
{ //called when the 'Back' button on the register part is pressed
part = 0; //goes back to showing login UI
blankErrors();
}
public void data_LogOut_Button()
{ //called when the 'Log Out' button on the data part is pressed
part = 0; //goes back to showing login UI
UserAccountManager.instance.LogOut();
blankErrors();
}
public void login_login_Button()
{ //called when the 'Login' button on the login part is pressed
if (isDatabaseSetup == true)
{
//check fields aren't blank
if ((input_login_username.text != "") && (input_login_password.text != ""))
{
//check fields don't contain '-' (if they do, login request will return with error and take longer)
if ((input_login_username.text.Contains("-")) || (input_login_password.text.Contains("-")))
{
//string contains "-" so return error
login_error.text = "Unsupported Symbol '-'";
input_login_password.text = ""; //blank password field
}
else
{
//ready to send request
StartCoroutine(sendLoginRequest(input_login_username.text, input_login_password.text)); //calls function to send login request
part = 3; //show 'loading...'
}
}
else
{
//one of the fields is blank so return error
login_error.text = "Field Blank!";
input_login_password.text = ""; //blank password field
}
}
}
IEnumerator sendLoginRequest(string username, string password)
{
if (isDatabaseSetup == true)
{
IEnumerator e = DCF.Login(username, password);
while (e.MoveNext())
{
yield return e.Current;
}
WWW returned = e.Current as WWW;
if (returned.text == "Success")
{
//Password was correct
blankErrors();
part = 2; //show logged in UI
//blank username field
input_login_username.text = ""; //password field is blanked at the end of this function, even when error is returned
UserAccountManager.instance.LogIn(username, password);
}
if (returned.text == "incorrectUser")
{
//Account with username not found in database
login_error.text = "Username not found";
part = 0; //back to login UI
}
if (returned.text == "incorrectPass")
{
//Account with username found, but password incorrect
part = 0; //back to login UI
login_error.text = "Incorrect Password";
}
if (returned.text == "ContainsUnsupportedSymbol")
{
//One of the parameters contained a - symbol
part = 0; //back to login UI
login_error.text = "Unsupported Symbol '-'";
}
if (returned.text == "Error")
{
//Account Not Created, another error occurred
part = 0; //back to login UI
login_error.text = "Database Error. Try again later.";
}
//blank password field
input_login_password.text = "";
}
}
public void register_register_Button()
{ //called when the 'Register' button on the register part is pressed
if (isDatabaseSetup == true)
{
//check fields aren't blank
if ((input_register_username.text != "") && (input_register_password.text != "") && (input_register_confirmPassword.text != ""))
{
//check username is longer than 4 characters
if (input_register_username.text.Length > 4)
{
//check password is longer than 6 characters
if (input_register_password.text.Length > 6)
{
//check passwords are the same
if (input_register_password.text == input_register_confirmPassword.text)
{
if ((input_register_username.text.Contains("-")) || (input_register_password.text.Contains("-")) || (input_register_confirmPassword.text.Contains("-")))
{
//string contains "-" so return error
register_error.text = "Unsupported Symbol '-'";
input_login_password.text = ""; //blank password field
input_register_confirmPassword.text = "";
}
else
{
//ready to send request
StartCoroutine(sendRegisterRequest(input_register_username.text, input_register_password.text, "[KILLS]0/[DEATHS]0")); //calls function to send register request
part = 3; //show 'loading...'
}
}
else
{
//return passwords don't match error
register_error.text = "Passwords don't match!";
input_register_password.text = ""; //blank password fields
input_register_confirmPassword.text = "";
}
}
else
{
//return password too short error
register_error.text = "Password too Short";
input_register_password.text = ""; //blank password fields
input_register_confirmPassword.text = "";
}
}
else
{
//return username too short error
register_error.text = "Username too Short";
input_register_password.text = ""; //blank password fields
input_register_confirmPassword.text = "";
}
}
else
{
//one of the fields is blank so return error
register_error.text = "Field Blank!";
input_register_password.text = ""; //blank password fields
input_register_confirmPassword.text = "";
}
}
}
IEnumerator sendRegisterRequest(string username, string password, string data)
{
if (isDatabaseSetup == true)
{
IEnumerator ee = DCF.RegisterUser(username, password, data);
while (ee.MoveNext())
{
yield return ee.Current;
}
WWW returnedd = ee.Current as WWW;
if (returnedd.text == "Success")
{
//Account created successfully
blankErrors();
part = 2; //show logged in UI
//blank username field
input_register_username.text = ""; //password field is blanked at the end of this function, even when error is returned
UserAccountManager.instance.LogIn(username, password);
}
if (returnedd.text == "usernameInUse")
{
//Account Not Created due to username being used on another Account
part = 1;
register_error.text = "Username Unavailable. Try another.";
}
if (returnedd.text == "ContainsUnsupportedSymbol")
{
//Account Not Created as one of the parameters contained a - symbol
part = 1;
register_error.text = "Unsupported Symbol '-'";
}
if (returnedd.text == "Error")
{
//Account Not Created, another error occurred
part = 1;
login_error.text = "Database Error. Try again later.";
}
input_register_password.text = "";
input_register_confirmPassword.text = "";
}
}
}
this is the second script
using System.Collections;
using UnityEngine;
using DatabaseControl;
public class UserAccountManager : MonoBehaviour {
public static UserAccountManager instance;
private void Awake()
{
if (instance != null)
{
Destroy(gameObject);
return;
}
instance = this;
DontDestroyOnLoad(this);
}
public static string LoggedIn_Username { get; protected set; }
private static string LoggedIn_Password;
public static string LoggedIn_Data { get; protected set; }
public static bool IsLoggedIn { get; protected set; }
public void LogOut()
{
LoggedIn_Username = "";
LoggedIn_Password = "";
IsLoggedIn = false;
Debug.Log("User Loggeout");
}
public void LogIn(string username,string password)
{
LoggedIn_Username = username;
LoggedIn_Password = password;
IsLoggedIn = true;
Debug.Log("User Logged in as " + username);
}
public void SendData(string data)
{
if (IsLoggedIn)
{
StartCoroutine(sendSendDataRequest(LoggedIn_Username, LoggedIn_Password,data));
}
}
IEnumerator sendSendDataRequest(string username, string password, string data)
{
IEnumerator eee = DatabaseControl.DCF.SetUserData(username, password, data);
while (eee.MoveNext())
{
yield return eee.Current;
}
WWW returneddd = eee.Current as WWW;
if (returneddd.text == "ContainsUnsupportedSymbol")
{
//One of the parameters contained a - symbol
Debug.Log("Data Upload Error. Could be a server error. To check try again, if problem still occurs, contact us.");
}
if (returneddd.text == "Error")
{
//Error occurred. For more information of the error, DC.Login could
//be used with the same username and password
Debug.Log("Data Upload Error: Contains Unsupported Symbol '-'");
}
}
public void GetData()
{ //called when the 'Get Data' button on the data part is pressed
if (IsLoggedIn == true)
{
//ready to send request
StartCoroutine(sendGetDataRequest(LoggedIn_Username, LoggedIn_Password)); //calls function to send get data request
}
}
IEnumerator sendGetDataRequest(string username, string password)
{
string data = "ERROR";
IEnumerator eeee = DatabaseControl.DCF.GetUserData(username, password);
while (eeee.MoveNext())
{
yield return eeee.Current;
}
WWW returnedddd = eeee.Current as WWW;
if (returnedddd.text == "Error")
{
//Error occurred. For more information of the error, DC.Login could
//be used with the same username and password
Debug.Log("Data Upload Error. Could be a server error. To check try again, if problem still occurs, contact us.");
}
else
{
if (returnedddd.text == "ContainsUnsupportedSymbol")
{
//One of the parameters contained a - symbol
Debug.Log("Get Data Error: Contains Unsupported Symbol '-'");
}
else
{
//Data received in returned.text variable
string DataRecieved = returnedddd.text;
data = DataRecieved;
}
}
LoggedIn_Data = data;
}
}
I am getting error: NullReferenceException: Object reference not set to an instance of an object LoginMenu.Start () (at Assets/Scriptes/LoginMenu.cs:48)
NullReferenceException: Object reference not set to an instance of an object LoginMenu+c__Iterator0.MoveNext () (at Assets/Scriptes/LoginMenu.cs:173) UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Coroutines.cs:17)
