/*
* /// <summary>
* /// ReadAsync: Task that waits on data and reads asynchronously from the serial device InputStream
* /// </summary>
* /// <param name="cancellationToken">CancellationTokenSource ReadCancellationTokenSource, for determining if read is allowed or has been cancelled</param>
* /// <returns>string received from connected serial device</returns>
* private async Task<string> ReadAsync(CancellationToken cancellationToken)
* {
* Task<UInt32> loadAsyncTask;
*
* uint ReadBufferLength = 1024;
*
* // If task cancellation was requested, comply
* cancellationToken.ThrowIfCancellationRequested();
*
* // Set InputStreamOptions to complete the asynchronous read operation when one or more bytes is available
* dataReaderObject.InputStreamOptions = InputStreamOptions.Partial;
*
* using (var childCancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken))
* {
* // Create a task object to wait for data on the serialPort.InputStream
* loadAsyncTask = dataReaderObject.LoadAsync(ReadBufferLength).AsTask(childCancellationTokenSource.Token);
*
* // Launch the task and wait
* UInt32 bytesRead = await loadAsyncTask;
* if (bytesRead > 0)
* {
* return dataReaderObject.ReadString(bytesRead);
* //status.Text = "bytes read successfully!";
* }
* }
*
* return null;
* }
*/
/// <summary>
/// - Creates an async task that performs the write operation to the serial device output stream
/// </summary>
/// <param name="text">string to send serially</param>
public async Task SendText(string text)
{
try
{
if (serialPort != null)
{
// Create the DataWriter object and attach to OutputStream
dataWriteObject = new DataWriter(serialPort.OutputStream);
//Launch the WriteAsync task to perform the write
await ss.WriteAsync(dataWriteObject, text);
//await WriteAsync(text);
}
else
{
//status.Text = "Select a device and connect";
}
}
catch (Exception ex)
{
//status.Text = "SendTextk: " + ex.Message;
}
finally
{
// Cleanup once complete
if (dataWriteObject != null)
{
dataWriteObject.DetachStream(); //disconnect from output stream
dataWriteObject = null;
}
}
}