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How to find Correct path to save data in unity

I've a game. I should save the game whenever end user exit.
how to know where to save? because If I save the game to the under C://Users/.. path what happens if user uses Android or IOS? what is the solution for this problem?

You should use Application.persistentDataPath method.
This value is a directory path where you can store data that you want
to be kept between runs. When you publish on iOS and Android,
persistentDataPath points to a public directory on the device. Files
in this location are not erased by app updates. The files can still be
erased by users directly.
When you build the Unity application, a GUID is generated that is
based on the Bundle Identifier. This GUID is part of
persistentDataPath. If you keep the same Bundle Identifier in future
versions, the application keeps accessing the same location on every
update.
using UnityEngine;
public class Info : MonoBehaviour
{
void Start()
{
Debug.Log(Application.persistentDataPath);
}
}

Use application data folder which changes depending on platform.
//Attach this script to a GameObject
//This script outputs the Application’s path to the Console
//Run this on the target device to find the application data path for the platform
using UnityEngine;
public class Example : MonoBehaviour
{
string m_Path;
void Start()
{
//Get the path of the Game data folder
m_Path = Application.dataPath;
//Output the Game data path to the console
Debug.Log("dataPath : " + m_Path);
}
}
Read more about it here at source

There is structure or class and on it base will be better to creating objects and writing its in file.
[System.Serialisable]
public class AAA{
public string Name = "";
public int iNum = 0;
public double dNum = 0.0;
public float fNum = 0f;
int[] array;
// Here may be any types of datas and arrays and lists too.
}
AAA aaa = new AAA(); // Creating object which will be serialis of datas.
// Initialisation our object:
aaa.Name = "sdfsf";
aaa.iNum = 100;
string path = "Record.txt"
#if UNITY_ANDROID && !UNITY_EDITOR
path = Path.Combine(Application.persistentDataPath, path);
#else
path = Path.Combine(Application.dataPath, path);
#endif
// Writing datas in file - format JSON:
string toJson = JsonUtility.ToJson(aaa, true);
File.WriteAllText(path, toJson);
// reading datas from file with JSON architecture and serialis.. it in object:
string fromjson = File.ReadAllText(path);
AAA result = JsonUtility.FromJson<AAA>(fromjson);

Drag And Drop C# Windows Form Application From another Application

I am trying to drag from another windows application (EM Client, thunderbird or outlook) onto my form. When an email is dragged from the other application to windows explore it will drop as a file. If the user drags onto my application I would like to get the file contents as a file stream.
I was able to get this working with a UWP app, but I need to get it working in a Windows Form app so it will work in Windows 7.
I have found lots of examples of going the other way (dragging from App to windows).
The thing that makes this so annoying is it is easy in the UWP app.
Here is how I did it in the UWP app, the results of which is I get a new file saved in the roaming folder at name "email.eml":
XAML
<Grid AllowDrop="True" DragOver="Grid_DragOver" Drop="Grid_Drop"
Background="LightBlue" Margin="10,10,10,353">
<TextBlock>Drop anywhere in the blue area</TextBlock>
</Grid>
XAML.CS
namespace App1
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();
}
private void Grid_DragOver(object sender, DragEventArgs e)
{
e.AcceptedOperation = DataPackageOperation.Copy;
}
private async void Grid_Drop(object sender, DragEventArgs e)
{
if (e.DataView.Contains(StandardDataFormats.StorageItems))
{
var items = await e.DataView.GetStorageItemsAsync();
if (items.Count > 0)
{
var storageFile = items[0] as StorageFile;
var reader = (await storageFile.OpenAsync(FileAccessMode.Read));
IBuffer result = new byte[reader.Size].AsBuffer();
var test = await reader.ReadAsync(result, result.Length,Windows.Storage.Streams.InputStreamOptions.None);
Windows.Storage.StorageFolder storageFolder =
Windows.Storage.ApplicationData.Current.LocalFolder;
Windows.Storage.StorageFile sampleFile = await storageFolder.CreateFileAsync("email.eml",Windows.Storage.CreationCollisionOption.ReplaceExisting);
await Windows.Storage.FileIO.WriteBufferAsync(sampleFile, test);
}
}
}
}
}
I have read every article that that is listed on this answer, plus more:
Trying to implement Drag and Drop gmail attachment from chrome
Basically no matter how I attack it I end up with one of 3 results:
a exception for "Invalid FORMATETC structure (Exception from HRESULT: 0x80040064(DV_E_FORMATETC))"
my MemoryStream is null
I get a security violation
This is the Code that gets a security violation:
MemoryStream ClipboardMemoryStream = new MemoryStream();
BinaryFormatter bft = new BinaryFormatter();
bft.Serialize(ClipboardMemoryStream, e.Data.GetData("FileGroupDescriptorW", false));
byte[] byteArray = ClipboardMemoryStream.ToArray();
My guess is that I need to implement the e.Data.GetData("FileGroupDesciptorW") is returning a IStorage Class, and I need to implement that class, but I am loss on how to do it, plus I am not sure that is the case
e.Data.GetType shows its a marshalbyrefobject, I have attempted to do the Remoting manually, but I got stuck on not having an open channel.
https://learn.microsoft.com/en-us/windows/desktop/api/objidl/nn-objidl-istorage
https://learn.microsoft.com/en-us/windows/desktop/shell/datascenarios#dragging-and-dropping-shell-objects-asynchronously

So After reaching out to a professional for help I have a working example. The trick was to get "FileDescriptorW" working in the Custom ComObject class. You will find a version of this class in the Drag from Outlook example but it does not work when dragging from EM Client, this does.
Here is the Code:
Code is too Big to post
Then You can use it like this:
MyDataObject obj = new MyDataObject(e.Data);
string[] fileNames = { };
//ThunderBird Does a FileDrop
if (obj.GetDataPresent(DataFormats.FileDrop, true))
{
string[] tempFileNames = (string[])obj.GetData(DataFormats.FileDrop);
List<string> tempFileNameList = new List<string>();
foreach(string f in tempFileNames)
{
tempFileNameList.Add(Path.GetFileName(f));
}
fileNames = tempFileNameList.ToArray();
} else if (fileNames.Length == 0)
{
//EM Client uses "FileGroupDescriptorW"
fileNames = (string[])obj.GetData("FileGroupDescriptorW");
}else if (fileNames.Length == 0)
{
//Outlook Uses "FileGroupDescriptor"
fileNames = (string[])obj.GetData("FileGroupDescriptor");
}
int index = 0;
foreach (string f in fileNames)
{
File.WriteAllBytes("C:\\FilePath\\"+f, obj.GetData("FileContents", index).ToArray());
index++;
}

PlaylistLoader() not found in NAudio c#

private void LoadPlaylist(object p)
{
var ofd = new OpenFileDialog();
ofd.Filter = "PLAYLIST files (*.playlist) | *.playlist";
string abc = ofd.ShowDialog().ToString();
if (abc == "OK")
{
Playlist = new PlaylistLoader().Load(ofd.FileName).ToObservableCollection(); // load the playlist
}
}
I try to implement an Audio Player using NAudio. I use the reference https://www.pluralsight.com/guides/microsoft-net/building-a-wpf-media-player-using-naudio
But "PlaylistLoader" class was not found. "Playlist" is an ObservableCollection of type "Track". I try to add audio file to Track object as hadcoded, but failed. Anyone familiar with NAudio please help.

PlaylistLoader is not part of NAudio. It is a helper class created by the author of that article, so you should download the source if available or ask the author to provide code

How to stream/download&play an audio from URL?

I need to stream or download and play an audio getted from an URL in Unity3D, running on iOS.
The Audio comes from a text-to-audio service and I need to play it on Unity:
http://api.ispeech.org/api/rest?apikey=...&action=convert&voice=eurspanishfemale&text=hola+que+tal
I've been googling all the morning and not found a valid solution...
There is a code snippet in the Unity3D documentation (WWW-audioClip,WWW.GetAudioClip), but is not working, I have debugged and the error says it couldn't open the file.
using UnityEngine;
using System.Collections;
public class AudioURLScript : MonoBehaviour {
public string url = "http://api.ispeech.org/api/rest?apikey=...&action=convert&voice=eurspanishfemale&text=hola+que+tal";
public AudioSource source;
void Start() {
WWW www = new WWW("file://"+url);
source = GetComponent<AudioSource>();
source.clip = www.GetAudioClip(false,true);
}
void Update() {
if (!source.isPlaying && source.clip.isReadyToPlay)
source.Play();
}
}
Thanks
SOLUTION
This is my working solution right now.
void Start(){
StartCoroutine(DownloadAndPlay("http://api.ispeech.org/api/rest?apikey=...&action=convert&voice=eurspanishfemale&text=Hola+que+tal"));
}
IEnumerator DownloadAndPlay(string url)
{
WWW www = new WWW(url);
yield return www;
AudioSource audio = GetComponent<AudioSource>();
audio.clip = www.GetAudioClip(false, true,AudioType.MPEG);
audio.Play();
}

You don't mention the platform you are on, so I'm going to assume Windows.
Unity Windows runtime only supports WAV or OGG. The link to the audio service file you provided is downloading as a MP2 Audio File (common in broadcasting). Unity will not be able to play that (or MP3).
For reference, Android and iOS platforms do support MP3 (but not MP2).
So, you're first issue is to make sure your audio source is in compatible format.
The code sample is incorrect for 3 reasons;
the URL is https: (which tells unity to download from the internet) but then you pre-pend file: to it (which tells unity to load from the local file system). So you should pick one or the other.
it wouldn't work if you picked https because that particular link (I know it's just an example) but it requires a user to be logged in to the service (and using cookies to know that), so it doesn't send you an audio file, it sends you a HTML page telling the user to login or register.
As #fafase says, the WWW must be placed within a co-routine, so that it can download over multiple frames.
OK, here's what I suggest.
If you can know the audio files a head of time, download them and transcode to OGG (if windows) or MP3 (if mobile) and upload them to your own server (say Amazon S3, or a $10 a month unlimited website).
Then, use this code to download and play it:
StartCoroutine(DownloadAndPlay("http://myserver.com/audio/test.ogg"));
IEnumerator DownloadAndPlay(string url)
{
WWW www = new WWW(url);
yield return www;
AudioSource audio = GetComponent<AudioSource>();
audio.clip = www.GetAudioClip(false, false);
audio.Play();
}

A WWW object is a wrapper for a HTTP request, containing the creation of the connection, the transfer of the data and the closing of the connection (and some extra actions).
This does not happen in one frame and requires a coroutine.
void Start() {
StartCoroutine(GetAudio(url));
}
private IEnumerator GetAudio(string url)
{
WWW www = new WWW("file://"+url);
yield return www;
if(string.IsNullOrEmpty(www.error) == false)
{
Debug.Log("Did not work");
yield break;
}
source = GetComponent<AudioSource>();
source.clip = www.GetAudioClip(false,true);
}

The WWW package got deprecated and Unity3D recommended using the UnityWebRequest package for API communications.
Try the following code snippet to download audio from a URL and play it using the AudioSource gameObject.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;
public class DownloadAndPlay : MonoBehaviour
{
public AudioSource audioSource;
// Start is called before the first frame update
void Start()
{
string URL = "http://api.ispeech.org/api/rest?apikey=...&action=convert&voice=eurspanishfemale&text=hola+que+tal";
StartCoroutine(DownloadAudio(URL));
}
// Update is called once per frame
void Update()
{
}
IEnumerator DownloadAudio(string URL) {
using (UnityWebRequest www_audio = UnityWebRequestMultimedia.GetAudioClip(URL, AudioType.MPEG)) {
yield return www_audio.SendWebRequest();
if (www_audio.isNetworkError) {
Debug.Log(www_audio.error);
} else {
AudioClip clip = DownloadHandlerAudioClip.GetContent(www_audio);
audioSource.clip = clip;
audioSource.Play();
}
}
}
}
For more: https://docs.unity3d.com/ScriptReference/Networking.UnityWebRequest.html

Developing a MP3 Player using C#

I'm currently developing a MP3 player using C#. I'm a beginner. I have been able to develop a normal MP3 player with minimal functionalities like open file, pause, play and stop. But the problem is it plays some songs and doesn't play some. I have imported the winmm.dll file too. But some files are played while some are not.Moreover can anyone suggest how can I add a stack of songs to it which will play randomly?The code is:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
namespace MP3Player
{
class MusicPlayer
{
Boolean isPlay=false;
[DllImport("winmm.dll")]
private static extern long mciSendString(string lpstrCommand, StringBuilder lpstrReturnString, int uReturnLength, int hwndCallback);
public void open(String file)
{
string command = "open \"" + file + "\" type MPEGVideo alias MyMp3";
mciSendString(command, null, 0, 0);
isPlay = false;
}
public void play()
{
if (isPlay == false)
{
string command = "play MyMP3";
mciSendString(command, null, 0, 0);
isPlay = true;
}
}
public void pause()
{
if (isPlay == true)
{
string command = "pause MyMP3";
mciSendString(command, null, 0, 0);
isPlay = false;
}
}
public void stop()
{
string command = "stop MyMp3";
mciSendString(command, null, 0, 0);
isPlay = false;
command = "close MyMp3";
mciSendString(command, null, 0, 0);
}
}
}

I dont know why your app doesnt play some mp3s, i think i can assume its because of the audio encoding, but dont quote me.
As for your "Shuffle feature"
what you can try to implement is an array that looks in a directory and and gets all the mp3 files in that directory,
then it randomly plays a song,
heres a sample code:
fileinfo MySongs() = MySongDirectoryString.getFiles();
foreach (song in MySong)
{
string SongName = song.tostring();
//code to play that song
}

I suggest using Windows Media Player SDK. Here's an example.

For your random playing.
Use a stack (makes it easier to track progress)
//Retrieve a list of files from a directory.
var di = new DirectoryInfo("Path to folder");
//Get the files and order them randomly.
var listOfFiles = di.GetFiles().OrderBy(s=> Guid.NewGuid);
//Convert the list to a stack.
var stack = new Stack<FileInfo>(listOfFiles);
Now you can use your stack with the Pop method to get the next random song in the list.
//Usage
var current = stack.Pop();
As for the not playing issue, you might want to use LAME encoder/decoder for your mp3 files it's more robust than the windows dll.