在Windows通用應用程序中流媒體圖像c＃

Question

我在c＃中用於通過網絡在c＃中流視頻的類不在Windows通用應用程序中接受。 所以，請有人能告訴我如何創建位圖將其轉換爲byte []通過套接字發送並將其轉換回位圖。首先，通用應用程序中的c＃甚至不識別變量類型的位圖。它甚至不承認命名空間system.drawing。感謝

Answer 1

1. Base64的爲位圖

   string base64string="";       
   var fileStream = Base64ToStream(base64string); 
            var memStream = new MemoryStream(); 
            await fileStream.CopyToAsync(memStream); 
            memStream.Position = 0; 
            var bitmap = new BitmapImage(); 
            bitmap.SetSource(memStream.AsRandomAccessStream()); 
            lstBitImages.Insert(0, new PhotoModel(bitmap, "00", objPhoto.PhotoName, objPhoto.PhotoBase64, objPhoto.PhotoType, objPhoto.PhotoLink, ".jpg", "Visible", "Collapsed")); 
            displayphotolst.Add(objPhoto); 
            PhotoList.ItemsSource = lstBitImages; 
   

Base64ToStream（base64string）;

public Stream Base64ToStream(string base64String) 
     { 
      byte[] imageBytes = Convert.FromBase64String(base64String); 
      MemoryStream stream2 = new MemoryStream(imageBytes); 
      return stream2; 
     } 

圖像的完整路徑爲位圖

objModel.PhotoId = "0"; 
         var fullPath = string.Format(@"{0}\{1}", destinationFolder.Path, guid + "_" + file.Name); 
         string base64Image = string.Empty; 
         await Task.Run(() => 
         { 
          Task.Yield(); 
          var photo = File.ReadAllBytes(fullPath); 
          base64Image = Convert.ToBase64String(photo); 
          objModel.PhotoBase64 = base64Image; 
         }); 
         var fileStream = Base64ToStream(base64Image); 
         var memStream = new MemoryStream(); 
         await fileStream.CopyToAsync(memStream); 
         memStream.Position = 0; 
         var bitmap = new BitmapImage(); 
         bitmap.SetSource(memStream.AsRandomAccessStream()); 

Answer 2

繼文檔前。 https://docs.microsoft.com/en-us/windows/uwp/networking/sockets

MediaCapture mediaCapture; 
    string serviceNameForConnect = "22112"; 
    string hostNameForConnect = "localhost"; 
    NetworkAdapter adapter = null; 
    StreamSocket clientSocket = null; 

    private async void StartListener_Click(object sender, RoutedEventArgs e) 
    { 
     StreamSocketListener listener = new StreamSocketListener(); 

     listener.ConnectionReceived += OnConnection; 

     await listener.BindServiceNameAsync(serviceNameForConnect); 
    } 

    private async void ConnectSocket_Click(object sender, RoutedEventArgs e) 
    { 
     HostName hostName; 

     mediaCapture = new MediaCapture(); 

     await mediaCapture.InitializeAsync(); 

     try 
     { 
      hostName = new HostName(hostNameForConnect); 
     } 
     catch (ArgumentException ex) 
     { 
      return; 
     } 

     clientSocket = new StreamSocket(); 

     try 
     { 
      await clientSocket.ConnectAsync(hostName, serviceNameForConnect); 
     } 
     catch (Exception exception) 
     { 
      // If this is an unknown status it means that the error is fatal and retry will likely fail. 
      if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown) 
      { 
       throw; 
      } 
     } 
    } 

    private async void Send_Click(object sender, RoutedEventArgs e) 
    { 
     object outValue; 
     // Create a DataWriter if we did not create one yet. Otherwise use one that is already cached. 
     DataWriter writer; 

     if (!CoreApplication.Properties.TryGetValue("clientDataWriter", out outValue)) 
     { 
      writer = new DataWriter(clientSocket.OutputStream); 

      CoreApplication.Properties.Add("clientDataWriter", writer); 
     } 
     else 
     { 
      writer = (DataWriter)outValue; 
     } 

     while (true) 
     { 
      var memoryStream = new InMemoryRandomAccessStream(); 

      await mediaCapture.CapturePhotoToStreamAsync(ImageEncodingProperties.CreateJpeg(), memoryStream); 

      await Task.Delay(TimeSpan.FromMilliseconds(18.288)); //60 fps 

      memoryStream.Seek(0); 

      writer.WriteUInt32((uint)memoryStream.Size); 

      writer.WriteBuffer(await memoryStream.ReadAsync(new byte[memoryStream.Size].AsBuffer(), (uint)memoryStream.Size, InputStreamOptions.None)); 

      // Write the locally buffered data to the network. 
      try 
      { 
       await writer.StoreAsync(); 
      } 
      catch (Exception exception) 
      { 
       // If this is an unknown status it means that the error if fatal and retry will likely fail. 
       if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown) 
       { 
        throw; 
       } 
      } 
     } 
    } 

    private async void OnConnection(StreamSocketListener sender, StreamSocketListenerConnectionReceivedEventArgs args) 
    { 
     await Task.WhenAll(DownloadVideos(args)); 
    } 

    public async Task DownloadVideos(StreamSocketListenerConnectionReceivedEventArgs args) 
    { 
     DataReader reader = new DataReader(args.Socket.InputStream); 

     try 
     { 
      while (true) 
      { 
       // Read first 4 bytes (length of the subsequent string). 
       uint sizeFieldCount = await reader.LoadAsync(sizeof(uint)); 

       if (sizeFieldCount != sizeof(uint)) 
       { 
        // The underlying socket was closed before we were able to read the whole data. 
        return; 
       }      
       uint stringLength = reader.ReadUInt32(); 

       uint actualStringLength = await reader.LoadAsync(stringLength); 

       if (stringLength != actualStringLength) 
       { 
        // The underlying socket was closed before we were able to read the whole data. 
        return; 
       } 

       NotifyUserFromAsyncThread(reader.ReadBuffer(actualStringLength)); 
      } 
     } 
     catch (Exception exception) 
     { 
      // If this is an unknown status it means that the error is fatal and retry will likely fail. 
      if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown) 
      { 
       throw; 
      } 
     } 
    } 

    private void NotifyUserFromAsyncThread(IBuffer buffer) 
    { 
     var ignore = Dispatcher.RunAsync(
      CoreDispatcherPriority.Normal,() => 
      { 
       Stream stream = buffer.AsStream(); 

       byte[] imageBytes = new byte[stream.Length]; 

       stream.ReadAsync(imageBytes, 0, imageBytes.Length); 

       InMemoryRandomAccessStream ms = new InMemoryRandomAccessStream(); 

       ms.AsStreamForWrite().Write(imageBytes, 0, imageBytes.Length); 

       ms.Seek(0); 

       var image = new BitmapImage(); 

       image.SetSource(ms); 

       ImageSource src = image; 

       imageElement.Source = src; 
      }); 
    }