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Dear everybody.
Using Microsoft Visual Studio Community 2022 (64 bits) - Current Versión 17.9.3 on Windows 10 most recent update, Packaged WinUI with C#
I am programming from scratch a new program (WinUI with C#) to manage my motorized telescope and I am trying to communicate with my 32 bit microcontrollers. For now I can list the serial ports and access them. I have been investigating but I need to keep the port open and attend any data that comes in (whenever it comes in) and also the main program can send data through the same serial port opened. I don't know when data will come in, it depends on the microcontroller. On my previous program WinForms I used sytem.IO and i had a delegate thread for SerialDataReceivedEventHandler which got called when any serial data came in and attended it using the DataReceived handler overrride. I cannot find anything similar that I can do with serialdevice in winui to have some kind of async (parallel method / thread) to get fired when data comes in through the serial port and handle it and act in consecuence from the method and pass the data to the mainprogram or tell the main program that serial data is available for processing if necesarry from the main program that is running. This function / method is continuos and should get fired when any data is received.
Any help appreciated.
Best Regards
Paul Harvey Chiverton
Hello. I have created an async function that opens the port (serialdevice) and should be able to stay reading the serial port to see if any data is available and act in consecuence (allthough this act hasn't been made yet). It selects correctly the port but when in the endless loop i get an unmanaged exception (29580) at the datareader psInput.LoadAsync(100). There isn't any data at the serial port but I believe (that is if I get rid of the exception) it should stay in the while clause without blocking the main program as I call the function without await. Below is the code of the function (it has to be improved of course, etc.). Maybe my approach isn't correct.
Any help appreciated
Paul
private async void IOpuertoserie()
{
UInt32 cantBytesInput = 0;
Byte[] inputBytes = new Byte[1000];
GLOBALES.AbiertoPuertoSerie = false;
serialDeviceInfos = await DeviceInformation.FindAllAsync(SerialDevice.GetDeviceSelector());
if (serialDeviceInfos.Count > 0) // Hay dispositivos COM
{
foreach (DeviceInformation serialDeviceInfo in serialDeviceInfos)
{
try
{
SerialDevice serialDevice = await SerialDevice.FromIdAsync(serialDeviceInfo.Id);
if (serialDevice != null)
{
if (serialDevice.PortName == ComboPuertoSerie.SelectedItem.ToString())
{
puertoSerieActual = serialDevice;
puertoSerieActual.Parity = SerialParity.None;
puertoSerieActual.StopBits = SerialStopBitCount.One;
puertoSerieActual.BaudRate = GLOBALES.VelocidadPS;
puertoSerieActual.DataBits = 8;
puertoSerieActual.Handshake = SerialHandshake.None;
psInput = new DataReader(puertoSerieActual.InputStream);
psInput.InputStreamOptions = InputStreamOptions.Partial;
psInput.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
GLOBALES.AbiertoPuertoSerie = true;
}
serialDevice.Dispose();
}
}
catch (Exception)
{
// Error. Nothing for now
}
if (GLOBALES.AbiertoPuertoSerie == true)
{
break;
}
}
if (GLOBALES.AbiertoPuertoSerie)
{
// Puerto serie está abierto
BtnImagenConectarPS.Source = new BitmapImage(new Uri("ms-appx:///Assets/ImagenesBotones/ConectarPSX.png"));
BtnTextoConectarPS.Text = "DESCONECTAR";
}
else
{
// Puerto serie está cerrado
BtnImagenConectarPS.Source = new BitmapImage(new Uri("ms-appx:///Assets/ImagenesBotones/ConectarPS.png"));
BtnTextoConectarPS.Text = "CONECTAR";
}
caja.Text = puertoSerieActual.PortName.ToString();
while (GLOBALES.AbiertoPuertoSerie)
{
try
{
cantBytesInput = await psInput.LoadAsync(100);
psInput.ReadBytes(inputBytes);
caja.Text = cantBytesInput.ToString();
}
catch
{
}
}
if (GLOBALES.AbiertoPuertoSerie)
{
// Puerto serie está abierto
BtnImagenConectarPS.Source = new BitmapImage(new Uri("ms-appx:///Assets/ImagenesBotones/ConectarPSX.png"));
BtnTextoConectarPS.Text = "DESCONECTAR";
}
else
{
// Puerto serie está cerrado
BtnImagenConectarPS.Source = new BitmapImage(new Uri("ms-appx:///Assets/ImagenesBotones/ConectarPS.png"));
BtnTextoConectarPS.Text = "CONECTAR";
}
}
}
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Any updates about this issue?
Hello,
Welcome to Microsoft Q&A!
As far as I'm concerned, there is no similar method to ·SerialDataReceivedEventHandler Delegate· in winui3
You need to use dataReader stay in the while clause. I suggest you could refer to the Doc: DataReader Class
And you could also refer to the thread: https://stackoverflow.com/questions/58343457/how-to-create-a-datareceived-event-for-serialdevice
Thank you.
Jeanine
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