C# Login Script doesn't work (Unity 2017.4). "UnityWebRequest"

Unity Engine
1

Hey Guys,

I’m trying to get a Login Script to work in Unity 2017.4. but it doesn’t send the _POST to my PHP-Script. The PHP-Script does work fine in Browser, but I can't get the _POST send from Unity to PHP.

This is the Script I use:

using UnityEngine;
using System.Collections;
using UnityEngine.Networking;

public class LoginScript : MonoBehaviour
{

    string loginURL = "http://cellenseres.de/includes/gamelogin.inc.php";
    string username = "";
    string password = "";
    string label = "";

    void OnGUI()
    {
        GUI.Window(0, new Rect(Screen.width / 4, Screen.height / 4, Screen.width / 2, Screen.height / 2 - 70), LoginWindow, "Login");
    }

    void LoginWindow(int windowID)
    {
        GUI.Label(new Rect(140, 40, 130, 100), "Username");
        username = GUI.TextField(new Rect(25, 60, 375, 30), username);
        GUI.Label(new Rect(140, 92, 130, 100), "Password");
        password = GUI.PasswordField(new Rect(25, 115, 375, 30), password, '*');

        if (GUI.Button(new Rect(25, 160, 375, 50), "Login"))
        {
            if (username != "" || password != "")
            {
                StartCoroutine(HandleLogin(username, password));
            }
            else
            {
                label = "Please fill in both fields.";
            }
        }

        GUI.Label(new Rect(55, 222, 250, 100), label);
    }

    IEnumerator HandleLogin(string username, string password)
    {
        label = "Checking username and password.";
        StartCoroutine(Login(username, password));
        yield break;
    }

    IEnumerator Login(string username, string password)
    {
        Debug.Log("Function Ran..");


        WWWForm form = new WWWForm();
        form.AddField("username", username);
        form.AddField("password", password);
        UnityWebRequest www = UnityWebRequest.Post(loginURL, form);
        www.chunkedTransfer = false;
        yield return www.SendWebRequest();


        string newString = www.downloadHandler.text.ToString();
        Debug.Log("New String:" + newString);
        int result = int.Parse(newString); //THIS GIVES ERROR, BITCH

        Debug.Log(www.downloadHandler.text);

        if (www.error != null)
        {
            label = ("Connection error.");
        }
        else
        {

            if (www.downloadHandler.text == "3")
            {
                label = ("Password incorrect.");
            }

            if (www.downloadHandler.text == "1")
            {
                label = ("Logged In");
            }

            if (www.downloadHandler.text == "2")
            {
                label = ("Username not found.");
            }
        }

        yield break;
    }

}

it ALWAYS sends a “0” back to Unity, which means that either $username or password was not sent to the PHP via _POST.

2

Try setting useHttpContinue property to false.

3 
using UnityEngine;
using System.Collections;
using UnityEngine.Networking;

public class LoginScript : MonoBehaviour
{

    string loginURL = "http://cellenseres.de/includes/gamelogin.inc.php";
    string username = "";
    string password = "";
    string label = "";

    void OnGUI()
    {
        GUI.Window(0, new Rect(Screen.width / 4, Screen.height / 4, Screen.width / 2, Screen.height / 2 - 70), LoginWindow, "Login");
    }

    void LoginWindow(int windowID)
    {
        GUI.Label(new Rect(140, 40, 130, 100), "Username");
        username = GUI.TextField(new Rect(25, 60, 375, 30), username);
        GUI.Label(new Rect(140, 92, 130, 100), "Password");
        password = GUI.PasswordField(new Rect(25, 115, 375, 30), password, '*');

        if (GUI.Button(new Rect(25, 160, 375, 50), "Login"))
        {
            if (username != "" || password != "")
            {
                StartCoroutine(HandleLogin(username, password));
            }
            else
            {
                label = "Please fill in both fields.";
            }
        }

        GUI.Label(new Rect(55, 222, 250, 100), label);
    }

    IEnumerator HandleLogin(string username, string password)
    {
        label = "Checking username and password.";
        StartCoroutine(Login(username, password));
        yield break;
    }

    IEnumerator Login(string username, string password)
    {
        Debug.Log("Function Ran..");


        WWWForm form = new WWWForm();
        form.AddField("username", username);
        form.AddField("password", password);
        UnityWebRequest www = UnityWebRequest.Post(loginURL, form);
        www.chunkedTransfer = false;
        www.useHttpContinue = false;
        yield return www.SendWebRequest();


        string newString = www.downloadHandler.text.ToString();
        Debug.Log("New String:" + newString);
        int result = int.Parse(newString); //THIS GIVES ERROR, BITCH

        Debug.Log(www.downloadHandler.text);

        if (www.error != null)
        {
            label = ("Connection error.");
        }
        else
        {

            if (www.downloadHandler.text == "3")
            {
                label = ("Password incorrect.");
            }

            if (www.downloadHandler.text == "1")
            {
                label = ("Logged In");
            }

            if (www.downloadHandler.text == "2")
            {
                label = ("Username not found.");
            }
        }

        yield break;
    }

}

have added “www.useHttpContinue = false;” before “yield return www.SendWebRequest();”
Still only getting a “0” back from the Server, which means that “username = _POST[‘username’];” is still empty.

4

What is returned when you var_dump the $_POST variables?

5

4100299--358861--upload_2019-1-14_14-1-44.png

Here are some DebugInfos.
TestUser and Testpassword are the inputs of the variables “username” and “password” which should be sent to my server via $_POST

uploadedBytes : 0. This means, that nothing were uploaded ($_POST weren’t sent to the server).
www.domainHandler.text outputs “0”. The echo I’ve setup for when no username/password were sent to the server ($username, $password are empty in my PHP script).

This is the php script I’m using (far from finished):

<?php
  
    require 'dbh.inc.php';
  
    $mailuid = $_POST['username'];
    $password = $_POST['password'];
  
    if(empty($mailuid) || empty($password)){
        echo '0'; //FIELD_EMPTY
    }
    else {
        $sql = "SELECT * FROM users WHERE username=? OR email=?;";
        $stmt = mysqli_stmt_init($conn);
        if(!mysqli_stmt_prepare($stmt, $sql)){
            echo '7'; //SQL_ERROR
        }
        else {
            mysqli_stmt_bind_param($stmt, "ss", $mailuid, $mailuid);
            mysqli_stmt_execute($stmt);
            $result = mysqli_stmt_get_result($stmt);
            if($row = mysqli_fetch_assoc($result)){
                $passCheck = password_verify($password, $row['password']);
                if($passCheck == false){
                    echo '2'; //PW Wrong
                }
                else if($passCheck == true){
                    echo '3'; //PW CORRECT
                }
                else {
                    echo '5'; //UNKNOWN_ERROR
                }
            }
            else {
                echo '1'; //User Not found  
            }  
        }
    }
?>
6

What if you immediately dump the post data on the server, and check that on your client. That way you can see exactly what was received.

7

Mind telling me how to do that? Haven’t done this before ^^’

EDIT: Oh, yea var_dump in PHP.
using: var_dump($_POST); gives me:

4100533--358894--upload_2019-1-14_15-18-0.png

8

Repeating my suggestion: Unity - Scripting API: Networking.UnityWebRequest.useHttpContinue

If setting that property to false doesn’t help, try using some debugging proxy like Fiddler to inspect the network traffic.