*SOLVED* Error writing to IOS file system works on android & editor

Questions & Answers
1

Hi all, Ive got a function that downloads json and the tries to save a copy on the device. It works fine on android and in the editor. Can’t put my finger on it. Ipad is running IOS 10 and settings in unity are 9 upwards if that adds anything.

Below is the unity code plus the error on xcode.

MONODEVELOP

using UnityEngine;
using System.Collections;
using System;
using System.IO;
using System.Collections.Generic;
 using LitJson;

public class loadJSONHome : MonoBehaviour {

public string url;
public string url2;
private string jsonString;
public static loadJSONHome instance;
public GameObject preloader;

void Awake(){
	if(instance==null){
	instance = this;
	}

}
void Start (){
      WWW www2 = new WWW(url);
      StartCoroutine(WaitForRequest(www2));
     // preloader.SetActive(true);

 }

IEnumerator WaitForRequest(WWW www2){
  yield return www2;
	
  // check for errors
  if (www2.error == null)
  {
	//SAVE JSON FROM ONLINE LOCALLY
    jsonString = www2.text;

		writeStringToFile(jsonString, "FoodnDrink_Cats.json");

	writeListings();
  } else {
      Debug.Log("WWW2 Error: "+ www2.error);
  }    
}

  void writeListings(){

	WWW www3 = new WWW(url2);
      StartCoroutine(WaitForRequest2(www3));
  }

IEnumerator WaitForRequest2(WWW www3){
  yield return www3;
	
  // check for errors
  if (www3.error == null)
  {
	//SAVE JSON FROM ONLINE LOCALLY
    jsonString = www3.text;

		writeStringToFile(jsonString, "listings_FoodnDrink.json");

   } else {
      Debug.Log("WWW3 Error: "+ www3.error);
  }   

     //preloader.SetActive(false); 
  }

	public void writeStringToFile( string str, string filename ){
		#if !WEB_BUILD
			string path = pathForDocumentsFile( filename );
			FileStream file = new FileStream (path, FileMode.Create, FileAccess.Write);

			StreamWriter sw = new StreamWriter( file );
			sw.WriteLine( str );

			sw.Close();
			file.Close();
		#endif	
	}

	public string readStringFromFile( string filename){ //, int lineIndex )
		#if !WEB_BUILD
			string path = pathForDocumentsFile( filename );

			if (File.Exists(path))
			{
				FileStream file = new FileStream (path, FileMode.Open, FileAccess.Read);
				StreamReader sr = new StreamReader( file );

			string str = null;
			str = sr.ReadToEnd ();

			sr.Close();
			file.Close();

			return str;
		}else{
		return null;
		}
		#else
		return null;
		#endif 
	}

	public string pathForDocumentsFile( string filename ){ 
		if (Application.platform == RuntimePlatform.IPhonePlayer)
		{
			string path = Application.dataPath.Substring( 0, Application.dataPath.Length - 5 );
			path = path.Substring( 0, path.LastIndexOf( '/' ) );
			return Path.Combine( Path.Combine( path, "Documents" ), filename );
		}else if(Application.platform == RuntimePlatform.Android){
		string path = Application.persistentDataPath;	
			path = path.Substring(0, path.LastIndexOf( '/' ) );	
			return Path.Combine (path, filename);
		}else {
			string path = Application.dataPath;	
			path = path.Substring(0, path.LastIndexOf( '/' ) );
			return Path.Combine (path, filename);
		}
	}

 }

XCODE

Location service updates are not enabled. Check LocationService.status before querying last location.

IsolatedStorageException: Could not find a part of the path “/var/containers/Bundle/Application/BC5FA0A8-9767-4689-8707-EBB7FA1886F5/Documents/FoodnDrink_Cats.json”.
at System.IO.FileStream…ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options) [0x00000] in :0
at System.IO.FileStream…ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean isAsync, Boolean anonymous) [0x00000] in :0
at System.IO.FileStream…ctor (System.String path, FileMode mode, FileAccess access) [0x00000] in :0
at loadJSONHome.writeStringToFile (System.String str, System.String filename) [0x00000] in :0
at loadJSONHome+c__Iterator5.MoveNext () [0x00000] in :0

(Filename: currently not available on il2cpp Line: -1)

Help appreciated.

2

I figured it out with help of a youtube video (posted at the end).

I changed the methods to store in binary data form to get around apple isolation and authorization file issues. This is also a lot cleaner.

Here’s the code :

using UnityEngine;
using System.Collections;
using System;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;

public class loadJSONHome : MonoBehaviour {

	public string url;
 	public string url2;
 	private string jsonString;
 	public static loadJSONHome instance;
 	public GameObject preloader;

 	void Awake(){
 		if(instance==null){
 		instance = this;
 		}

 	}
	void Start (){
          WWW www2 = new WWW(url);
          StartCoroutine(WaitForRequest(www2));
          preloader.SetActive(true);

   }

    IEnumerator WaitForRequest(WWW www2){
      yield return www2;
 		
      // check for errors
      if (www2.error == null)
      {
		//SAVE JSON FROM ONLINE LOCALLY
        jsonString = www2.text;
 
			Save(jsonString, "FoodnDrink_Cats.json");

  		writeListings();
      } else {
          Debug.Log("WWW2 Error: "+ www2.error);
      }    
  }

   void writeListings(){

		WWW www3 = new WWW(url2);
          StartCoroutine(WaitForRequest2(www3));
  	  }

	IEnumerator WaitForRequest2(WWW www3){
      yield return www3;
 		
      // check for errors
      if (www3.error == null)
      {
		//SAVE JSON FROM ONLINE LOCALLY
        jsonString = www3.text;
 
			Save(jsonString, "listings_FoodnDrink.json");

       } else {
          Debug.Log("WWW3 Error: "+ www3.error);
      }   
 
      preloader.SetActive(false); 
  }

	
	public void Save(string json, string filename){

		BinaryFormatter bf = new BinaryFormatter();
		FileStream file = File.Open(Application.persistentDataPath + "/" +filename, FileMode.Create);

		myFile current = new myFile();
		current.theFile = json;

		bf.Serialize(file, current);
		file.Close();

	}

	public string Load(string filename){

		if(File.Exists(Application.persistentDataPath + "/" + filename)){
			BinaryFormatter bf = new BinaryFormatter();
			FileStream file = File.Open(Application.persistentDataPath + "/" + filename, FileMode.Open);
			myFile data = (myFile)bf.Deserialize(file);
			file.Close();
			string fileinfo = data.theFile;
			return fileinfo;
		}else{
			return null;
		}
	}

}

[Serializable]
class myFile {

	public string theFile;

}

Here’s the Youtube Video : - YouTube

The location services is next to resolve but I think it’s down to xcode p.list gps settings