/// <summary>
/// This is the click handler for the 'Copy Strings' button. Here we will parse the
/// strings contained in the ElementsToWrite text block, write them to a stream using
/// DataWriter, retrieve them using DataReader, and output the results in the
/// ElementsRead text block.
/// </summary>
/// <param name="sender">Contains information about the button that fired the event.</param>
/// <param name="e">Contains state information and event data associated with a routed event.</param>
private async void TransferData(object sender, RoutedEventArgs e)
{
// Initialize the in-memory stream where data will be stored.
using (var stream = new Windows.Storage.Streams.InMemoryRandomAccessStream())
{
// Create the data writer object backed by the in-memory stream.
using (var dataWriter = new Windows.Storage.Streams.DataWriter(stream))
{
dataWriter.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
dataWriter.ByteOrder = Windows.Storage.Streams.ByteOrder.LittleEndian;
// Write each element separately.
foreach (string inputElement in inputElements)
{
uint inputElementSize = dataWriter.MeasureString(inputElement);
dataWriter.WriteUInt32(inputElementSize);
dataWriter.WriteString(inputElement);
}
// Send the contents of the writer to the backing stream.
await dataWriter.StoreAsync();
// For the in-memory stream implementation we are using, the flushAsync call is superfluous,
// but other types of streams may require it.
await dataWriter.FlushAsync();
// In order to prolong the lifetime of the stream, detach it from the DataWriter so that it
// will not be closed when Dispose() is called on dataWriter. Were we to fail to detach the
// stream, the call to dataWriter.Dispose() would close the underlying stream, preventing
// its subsequent use by the DataReader below.
dataWriter.DetachStream();
}
// Create the input stream at position 0 so that the stream can be read from the beginning.
stream.Seek(0);
using (var dataReader = new Windows.Storage.Streams.DataReader(stream))
{
// The encoding and byte order need to match the settings of the writer we previously used.
dataReader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
dataReader.ByteOrder = Windows.Storage.Streams.ByteOrder.LittleEndian;
// Once we have written the contents successfully we load the stream.
await dataReader.LoadAsync((uint)stream.Size);
var receivedStrings = "";
// Keep reading until we consume the complete stream.
while (dataReader.UnconsumedBufferLength > 0)
{
// Note that the call to readString requires a length of "code units" to read. This
// is the reason each string is preceded by its length when "on the wire".
uint bytesToRead = dataReader.ReadUInt32();
receivedStrings += dataReader.ReadString(bytesToRead) + "\n";
}
// Populate the ElementsRead text block with the items we read from the stream.
ElementsRead.Text = receivedStrings;
}
}
}
private async void OnConnection(Windows.Networking.Sockets.StreamSocketListener sender,
Windows.Networking.Sockets.StreamSocketListenerConnectionReceivedEventArgs args)
{
Debug.LogError("New client" + sender.Information.LocalPort);
var reader = new Windows.Storage.Streams.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;
}
// Read the string.
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;
}
// Display the string on the screen. The event is invoked on a non-UI thread, so we need to marshal
// the text back to the UI thread.
//NotifyUserFromAsyncThread(
// String.Format("Received data: \"{0}\"", reader.ReadString(actualStringLength)),
// NotifyType.StatusMessage);
}
}
catch (Exception ex)
{
Debug.LogException(ex);
// If this is an unknown status it means that the error is fatal and retry will likely fail.
if (Windows.Networking.Sockets.SocketError.GetStatus(ex.HResult) == Windows.Networking.Sockets.SocketErrorStatus.Unknown)
{
throw;
}
}
}
// Read out and print the message received from the socket.
private async void StartReader(Windows.Networking.Sockets.StreamSocket socket,
Windows.Storage.Streams.DataReader reader)
{
try
{
uint bytesRead = await reader.LoadAsync(sizeof(uint));
if (bytesRead > 0)
{
uint strLength = (uint)reader.ReadUInt32();
bytesRead = await reader.LoadAsync(strLength);
if (bytesRead > 0)
{
String message = reader.ReadString(strLength);
WriteMessageText("Received message: " + message + "\n");
StartReader(socket, reader); // Start another reader
}
else
{
WriteMessageText("The peer app closed the socket\n");
reader.Dispose();
CloseSocket();
}
}
else
{
WriteMessageText("The peer app closed the socket\n");
reader.Dispose();
CloseSocket();
}
}
catch
{
WriteMessageText("The peer app closed the socket\n");
reader.Dispose();
CloseSocket();
}
}
/// <summary>
/// This is the click handler for the 'Copy Strings' button. Here we will parse the
/// strings contained in the ElementsToWrite text block, write them to a stream using
/// DataWriter, retrieve them using DataReader, and output the results in the
/// ElementsRead text block.
/// </summary>
/// <param name="sender">Contains information about the button that fired the event.</param>
/// <param name="e">Contains state information and event data associated with a routed event.</param>
private async void TransferData(object sender, RoutedEventArgs e)
{
// Initialize the in-memory stream where data will be stored.
using (var stream = new Windows.Storage.Streams.InMemoryRandomAccessStream())
{
// Create the data writer object backed by the in-memory stream.
using (var dataWriter = new Windows.Storage.Streams.DataWriter(stream))
{
dataWriter.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
dataWriter.ByteOrder = Windows.Storage.Streams.ByteOrder.LittleEndian;
// Write each element separately.
foreach (string inputElement in inputElements)
{
uint inputElementSize = dataWriter.MeasureString(inputElement);
dataWriter.WriteUInt32(inputElementSize);
dataWriter.WriteString(inputElement);
}
// Send the contents of the writer to the backing stream.
await dataWriter.StoreAsync();
// For the in-memory stream implementation we are using, the flushAsync call is superfluous,
// but other types of streams may require it.
await dataWriter.FlushAsync();
// In order to prolong the lifetime of the stream, detach it from the DataWriter so that it
// will not be closed when Dispose() is called on dataWriter. Were we to fail to detach the
// stream, the call to dataWriter.Dispose() would close the underlying stream, preventing
// its subsequent use by the DataReader below.
dataWriter.DetachStream();
}
// Create the input stream at position 0 so that the stream can be read from the beginning.
stream.Seek(0);
using (var dataReader = new Windows.Storage.Streams.DataReader(stream))
{
// The encoding and byte order need to match the settings of the writer we previously used.
dataReader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
dataReader.ByteOrder = Windows.Storage.Streams.ByteOrder.LittleEndian;
// Once we have written the contents successfully we load the stream.
await dataReader.LoadAsync((uint)stream.Size);
var receivedStrings = "";
// Keep reading until we consume the complete stream.
while (dataReader.UnconsumedBufferLength > 0)
{
// Note that the call to readString requires a length of "code units" to read. This
// is the reason each string is preceded by its length when "on the wire".
uint bytesToRead = dataReader.ReadUInt32();
receivedStrings += dataReader.ReadString(bytesToRead) + "\n";
}
// Populate the ElementsRead text block with the items we read from the stream.
ElementsRead.Text = receivedStrings;
}
}
}
