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1. #Visual basic serial port datareceived event serial#
2. #Visual basic serial port datareceived event code#

However, you may still want to use the DataReceivedĮvent and so probably the link to the other thread. You can create a secondary thread and perform a blocking read operation and see the difference.

#Visual basic serial port datareceived event serial#

Note that the DataReceived event does not necessarily fire immediately as and when the data is sent to the serial port. Spektre, you can check out this link (if you havent alread) which has the same issue and multiple solutions: Private Sub serialPort_DataReceived( ByVal sender As Object, ByVal e As SerialDataReceivedEventArgs) Handles serialPort.DataReceived Random Microsoft® Community Contributor 2011 TxtTest.BeginInvoke(New myDelegate(AddressOf updateTextBox)) If it is necessary to modify elements in the main. Because this event is raised on a secondary thread, and not the main thread, attempting to modify some elements in the main thread, such as UI elements, could raise a threading exception. Private Sub serialPort_DataReceived(ByVal sender As Object, _īyVal e As System.IO.Ports.SerialDataReceivedEventArgs) The DataReceived event is raised on a secondary thread when data is received from the SerialPort object. Private Sub btnDisconnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisconnect.Click Private Sub btnConnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConnect.Click ' serialPort.Write("ABCDEFGHIJKLMNOPQRSTUVWXYZ")

#Visual basic serial port datareceived event code#

The code can be download here - Google share. In this case, User is Visual Studio program (in part 3). This will stop when User sends data (string) to Arduino, then Arduino will send it back to User. 'Dim t As New Threading.Thread(AddressOf foo) At start up, Arduino will send a string (a sentence) every 0.5 sec. Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Loadįor i As Integer = 0 To My. - 1Ĭ(My.(i)) The DataReceived event handler sets an AutoResetEvent that causes the Receive method to execute. The code is notified that there are bytes to read by the firing of the DataReceived event. The size of that buffer is controlled by the ReadBufferSize property. If data isĪctually being sent this works (the event handler does fire), though it isn't the approach I would take. Data from the serial port is first read into a Windows-created buffer.

I made a few minor changes and tested it on my loopBack setup (the commented code). TxtTest.Invoke( New myDelegate( AddressOf updateTextBox), New Object() )Ĭonsole.WriteLine(serialPort.ReadExisting) System.IO.File.CreateText( "E:\SleepData.txt")Įnd If End Sub Private Sub btnDisconnect_Click( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisconnect.ClickĮnd Sub Private Sub serialPort_DataReceived( ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles serialPort.DataReceived ObjStreamWriter = New StreamWriter( "E:\SleepData.txt") Dim FILE_NAME As String = "E:\SleepData.txt" If System.IO.File.Exists(FILE_NAME) = True Then Count - 1Ĭ( My.(i))Įnd Sub Private Sub btnConnect_Click( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConnect.ClickĮnd Try 'Pass the file path and the file name to the StreamWriter constructor. Private Sub Form1_Load( ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Loadįor i As Integer = 0 To My. Dim WithEvents serialPort As New IO.Ports.SerialPortĭim sBuffer As String = "" Dim sDisplayUpdates(1) As String Dim objStreamWriter As StreamWriter