/// <summary>
/// Download the Images.
/// </summary>
/// <returns>The download.</returns>
/// <param name="url">URL.</param>
public async Task<CacheModel> ImageDownload(string url)
{
try
{
if (url == null) return null;
SetData();
var filename = url.Substring(url.LastIndexOf("/") + 1);
if (GetCache(url) != null) return GetCache(url);
if (await FileHelper.ValidateFile(filename) && GetCache(url) == null)
{
CacheModel cache = new CacheModel(url, await FileHelper.GetFilePath("thumbnail_" + filename), await FileHelper.GetFilePath(filename));
Instance._cache.Add(cache);
return cache;
}
try
{
AddTaskIndex(url);
RunningAsyncTasks runningAsyncTask = GetRunningAsyncTask(url);
await runningAsyncTask._asyncCache;
RemoveTaskIndex(url);
return GetCache(url);
}
catch (NullReferenceException) { }
AddTaskIndex(url);
AsyncRequest downloadimage = new AsyncRequest().SetUrl(url);
RunningAsyncTasks running = new RunningAsyncTasks(downloadimage, SetCache(url, filename, downloadimage.ExecuteTask()));
Instance._requests.Add(running);
return await running._asyncCache;
}
#if __ANDROID__
catch (OutOfMemoryError ex)
{
Debug.WriteLine ("[AsyncStructure][ImageDownload] Out of Memory Error: " + ex.Message + " on this URL: " + url);
return null;
}
catch (NullPointerException ex)
{
Debug.WriteLine ("[AsyncStructure][ImageDownload] Null Pointer Exception Error: " + ex.Message + " on this URL: " + url);
return null;
}
#endif
#if __IOS__
#endif
#if WINDOWS_PHONE
catch (System.IO.FileNotFoundException ex)
{
Debug.WriteLine("[AsyncStructure][ImageDownload] File Not Found Exception Error: " + ex.Message + " on this URL: " + url);
return null;
}
catch (System.InvalidOperationException ex)
{
Debug.WriteLine("[AsyncStructure][ImageDownload] Invalid Operation Exception Error: " + ex.Message + " on this URL: " + url);
return null;
}
#endif
catch (OutOfMemoryException exmem)
{
Debug.WriteLine("[AsyncStructure][ImageDownload] Out of memory Error: " + exmem.Message + " on this URL: " + url);
return null;
}
catch (NullReferenceException exmem)
{
Debug.WriteLine("[AsyncStructure][ImageDownload] Null reference Error: " + exmem.Message + " on this URL: " + url);
return null;
}
catch (PlatformNotSupportedException exmem)
{
Debug.WriteLine("[AsyncStructure][ImageDownload] Platform not supported Error: " + exmem.Message + " on this URL: " + url);
return null;
}
catch (System.Exception exmem)
{
Debug.WriteLine("[AsyncStructure][ImageDownload] System Exception Error: " + exmem.Message + " on this URL: " + url);
return null;
}
}
/// <summary>
/// Sets Files and cache model
/// </summary>
/// <param name="url">URL of the HTTP request</param>
/// <param name="filename">name of the file to be generated</param>
/// <param name="imagedownloaded">array of bytes</param>
/// <returns>Object of the CacheModel class, null if there aren't any</returns>
private async Task<CacheModel> SetCache(string url, string filename, Task<byte[]> imagedownloaded)
{
var image = await imagedownloaded;
if (image != null)
{
var imagedownloadedresized = await ImageResizer.ResizeImage(image, 50, 50);
await FileHelper.WriteToFile(filename, image);
await FileHelper.WriteToFile("thumbnail_" + filename, imagedownloadedresized);
CacheModel cache = new CacheModel(url, await FileHelper.GetFilePath("thumbnail_" + filename), await FileHelper.GetFilePath(filename));
Instance._cache.Add(cache);
RemoveTaskIndex(url);
return cache;
}
RemoveTaskIndex(url);
return null;
}