在Windows通用应用程序C中流式传输图像

Question

Windows通用应用程序不接受我在C＃中用于在C＃中通过网络流式传输视频的类。 因此，请有人告诉我如何创建位图将其转换为byte []通过套接字发送并将其转换回位图。 首先，通用应用程序中的c＃甚至无法识别变量类型位图。 它甚至不识别名称空间system.drawing。 谢谢

Answer 1

1. Base64到位图

    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;
        }

位图的图像完整路径

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

按照文档ex。 https://docs.microsoft.com/zh-cn/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;
            });
    }