Read/Write Cache IOS, Iphone AssetBundle Problem

Hi, I can write to the cache and download the assetbundle just fine, but whenever I tried to read cache from ios document it doesn't seem to work(and I checked the organizer, so the file is actually been saved into the documents folder), however second time I click on the download asset button again, it goes and download from internet again....



Here is the code:

Code (csharp):

1.  
2.  
3. void OnGUI() {
4.         GUILayout.Space(0.5f);
5.         GUILayout.BeginHorizontal();
6.        
7.        
8.        
9.        
10.        
11.         if (GUILayout.Button("Download Asset"))
12.             StartDownload();   
13.        
14.         if (internetDownload != null  !Downloaded)
15.         {
16.             if (internetDownload.error == null)
17.             {
18.                 int progress = (int)(internetDownload.progress * 100);
19.                 GUILayout.Label(progress + "%");   
20.                
21.                
22.                 if (internetDownload.isDone  GUILayout.Button("Save Resource")  )
23.                 {
24.                     //GUILayout.BeginHorizontal();
25.                     Debug.Log("Saving resource to cache");
26.                    
27.                    
28.                     //GUILayout.EndHorizontal();
29.                    
30.                     FileStream cache = new System.IO.FileStream(GetiPhoneDocumentsPath() + PackageName, System.IO.FileMode.Create);
31.                     cache.Write(internetDownload.bytes, 0, internetDownload.bytes.Length);
32.                     cache.Close();
33.                     Debug.Log("Cache saved: " + GetiPhoneDocumentsPath()+ PackageName);
34.                        
35.                 }
36.             }
37.             else
38.             {
39.                 GUILayout.Label(internetDownload.error);       
40.             }  
41.         }
42.         GUILayout.EndHorizontal();
43.  
44. }
45.  
46.  
47. private void StartDownload() {
48.        
49.        
50.        
51.         cachedDownload = new WWW ("file://" + GetiPhoneDocumentsPath() + PackageName); // I tried both file:/ and file://
52.        
53.        
54.         StartCoroutine(WaitLoading(cachedDownload));
55.        
56.        
57.         assetBundle = cachedDownload.assetBundle;
58.        
59.        
60.         if(assetBundle == null)   // keep saying i have nothing....
61.         {
62.            Debug.Log("reads nothing from cache");  
63.            
64.         }
65.        
66.         Debug.Log("file://" + GetiPhoneDocumentsPath() + PackageName);
67.        
68.        
69.         if(assetBundle != nullß) // current file exsit on cache
70.         {
71.             Debug.Log("current file exist on cache");
72.             Downloaded = true;
73.            
74.            
75.            
76.             if (assetBundle != null)
77.             {
78.             // Alternatively you can also load an asset by name (assetBundle.Load("my asset name"))
79.        
80.                 Object go = assetBundle.mainAsset;
81.            
82.                 if (go != null)
83.                 {
84.                     instanced = Instantiate(go, someObject.transform.position, someObject.transform.rotation);
85.                 }
86.                 else
87.                 {
88.                     Debug.Log("Couldnt not instantiate object");                   
89.                 }  
90.             }
91.             else
92.             {
93.                 Debug.Log("Couldnt load resource");
94.             }
95.  
96.            
97.            
98.            
99.         }
100.         else
101.         {
102.             Debug.Log("downloading it from internet");
103.             Downloaded = false;
104.                
105.             internetDownload = new WWW (urlString + PackageName);
106.            
107.             StartCoroutine(WaitLoading(internetDownload));
108.            
109.             assetBundle = internetDownload.assetBundle;
110.         }
111.  
112.  
113.    
114.     }
115.  
116.  

 

well your code is wrong, you lack the yield return cachedDownload to wait that its done, so it will never be != null (www is always async even against the current file system and it will never return immediately with the downloaded data)

 

StartCoroutine(WaitLoading(cachedDownload));


the coroutine has the yield, i forgot to put it in there...


public IEnumerator WaitLoading(WWW download) {
yield return download;
}

 

Lines going after "StartCoroutine" will be executed immediately, because "StartCoroutine" is supposed to launch "pseudo parallel" routine and if this "parallel routine| waits for something it doesn't suspend execution of the parent routine.