使用后台上传器将视频文件上传到服务器

本文关键字：文件 服务器 视频 后台 | 更新日期: 2023-09-27 18:32:58

我正在创建面向Windows 8.0
的Windows应用商店应用程序我的 PC 上安装了 Windows 8.1 预览版，我使用 VS2012 创建了应用程序，并使用 BackgroundUploader 实现了文件上传到服务器，并使用休耕代码创建 UploadFromStreamAsync 方法 - 

string url = //url to upload videostring boundray = string.Format("abcboundry");
String header = string.Format("--{0}'r'nContent-Disposition: form-data; name='"{1}'"; filename='"{2}'"'r'n" + "Content-Type: {3}'r'n'r'n", boundray, "file", source.Name, "application/octet-stream");
string footer = string.Format("'r'n--{0}--'r'n", boundray);
Stream headerStream = GenerateStreamFromString(header);
Stream footerStream = GenerateStreamFromString(footer);
//Stream dataStream = iRandomstream.AsStream();
Stream dataStream = await source.OpenStreamForReadAsync();
MemoryStream fileDataStream = new MemoryStream();
await headerStream.CopyToAsync(fileDataStream);
await dataStream.CopyToAsync(fileDataStream);
await footerStream.CopyToAsync(fileDataStream);
fileDataStream.Position = 0;
IInputStream stream = fileDataStream.AsInputStream();
BackgroundUploader backgroundUploader = new BackgroundUploader();
backgroundUploader.SetRequestHeader("Content-Type", "multipart/form-data; boundary=" + boundray);
backgroundUploader.Method = "POST";
UploadOperation uploadOpration = await backgroundUploader.CreateUploadFromStreamAsync(new Uri(url), stream);
await HandleUploadAsync(uploadOpration, true);

它对我来说工作正常，但是当在其他安装了 Windows 8.0 的应用程序系统上进行测试时，由于访问违规异常而崩溃。已尝试读取或写入受保护的内存。这通常表示其他内存已损坏。错误

现在我试图将 BackgroundTransferContentPart 用于分段上传，但这段代码没有成功 -

List<BackgroundTransferContentPart> parts = new List<BackgroundTransferContentPart>();
BackgroundTransferContentPart part = new BackgroundTransferContentPart("file", source.Name);
part.SetHeader("Content-Type", "application/octet-stream");
part.SetFile(source);
parts.Add(part);
BackgroundUploader uploader = new BackgroundUploader();
uploader.Method = "POST";
UploadOperation uploadOp = await uploader.CreateUploadAsync(new Uri(url), parts, "form-data",boundray);
await HandleUploadAsync(uploadOp, true);
我

能做些什么来解决我的问题？

如何将大文件上传到服务器？

使用后台上传器将视频文件上传到服务器

我解决了我的问题。

  1. 在本地文件夹中创建一个临时原始文件并写入我们需要上传到文件的流（流包含页眉和页脚）
  2. 将此新创建的临时文件同步到存储文件
  3. 从存储文件获取输入流

  4. 现在，使用此流和用于创建流的相同边界创建上传。

    StorageFile VideoFileStream = await ApplicationData.Current.LocalFolder.CreateFileAsync("tempStream", CreationCollisionOption.OpenIfExists);
var fs2 = await VideoFileStream.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
IInputStream aaaa= fs2.GetInputStreamAt(0);
BackgroundUploader backgroundUploader = new BackgroundUploader();
backgroundUploader.SetRequestHeader("Content-Type", "multipart/form-data; boundary=" + boundray);
backgroundUploader.Method = "POST";
UploadOperation uploadOpration = await backgroundUploader.CreateUploadFromStreamAsync(new Uri(url),aaaa);
await HandleUploadAsync(uploadOpration, true);

您是否尝试过改用 WinRT 流？与其System.Net.MemoryStream，不如尝试Windows.Storage.Streams.InMemoryRandomStream。您可以使用RandomAccessStream.CopyAsync()来填充它。

相关文章：