如何使用Windows.Web.Http下载和存储图像？

如何使用Windows.Web.Http在Windows应用商店应用程序下载并存储来自互联网的jpeg图像？如何使用Windows.Web.Http下载和存储图像？

我面临的问题是，我不知道什么得到...异步和写...异步方法我必须使用图像？这与文件非常不同，而不是字符串。

只有Windows.Web.Http！

没有第三方解决方案！

如果您有其他建议，请使用评论部分，而不是答案。谢谢！

…  
using Windows.Storage; 
using Windows.Web.Http; 

Uri uri = new Uri("http://image.tmdb.org/t/p/w300/" + posterPath); 
HttpClient httpClient = new HttpClient(); 

// I guess I need to use one of the Get...Async methods? 
var image = await httpClient.Get…Async(uri); 

StorageFolder localFolder = ApplicationData.Current.LocalFolder; 
StorageFolder cachedPostersFolder = await localFolder.CreateFolderAsync("cached posters", CreationCollisionOption.OpenIfExists); 

StorageFile posterFile = await cachedPostersFolder.CreateFileAsync(posterPath, CreationCollisionOption.ReplaceExisting); 

// I guess I need to use one of the Write...Async methods? 
await FileIO.Write…Async(posterFile, image);

来源

2014-11-02 Daniel

为什么不使用[BackgroundDownloader（http://msdn.microsoft.com/library/windows相反，你可以使用GetStreamAsync的方式，我有/apps/windows.networking.backgroundtransfer.backgrounddownloader.aspx）？ – 2014-11-02 23:32:00

可以使用GetBufferAsync方法获得一个缓冲区，然后调用FileIO.WriteBufferAsync到缓冲区写入文件：

Uri uri = new Uri("http://i.stack.imgur.com/ZfLdV.png?s=128&g=1"); 
string fileName = "daniel2.png"; 

StorageFile destinationFile = await KnownFolders.PicturesLibrary.CreateFileAsync(
     fileName, CreationCollisionOption.GenerateUniqueName); 


HttpClient client = new HttpClient(); 

var buffer = await client.GetBufferAsync(uri); 
await Windows.Storage.FileIO.WriteBufferAsync(destinationFile, buffer);

来源

2014-11-02 23:38:51

image1.Source = new BitmapImage(new Uri("http://www.image.com/image.jpg",  UriKind.RelativeOrAbsolute)); 


     using (var mediaLibrary = new MediaLibrary()) 
     { 
      using (var stream = new MemoryStream()) 
      { 
       var fileName = string.Format("Gs{0}.jpg", Guid.NewGuid()); 
       bmp.SaveJpeg(stream, bmp.PixelWidth, bmp.PixelHeight, 0, 100); 
       stream.Seek(0, SeekOrigin.Begin); 
       var picture = mediaLibrary.SavePicture(fileName, stream); 
       if (picture.Name.Contains(fileName)) return true; 
      } 
     }

来源

2014-11-03 12:46:37 pravin

这是一个类似的答案约翰的，但是在WP8.1中，您不能使用GetBufferAsync。使用功能

Uri uri = new Uri(UriString); 
string fileName = p4.IconLocation; 

HttpClient client = new HttpClient(); 

var streamImage = await client.GetStreamAsync(uri); 

await SaveToLocalFolderAsync(streamImage, fileName);

：

public async Task SaveToLocalFolderAsync(Stream file, string fileName) 
    { 
     StorageFolder localFolder = ApplicationData.Current.LocalFolder; 
     StorageFile storageFile = await localFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting); 
     using (Stream outputStream = await storageFile.OpenStreamForWriteAsync()) 
     { 
      await file.CopyToAsync(outputStream); 
     } 
    }

来源

2015-02-18 14:14:53

如何使用Windows.Web.Http下载和存储图像？

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