Problem when Reading Multiple values from Arduino to Vb

Question

Hi Mates,
I am getting 4 values from Arduino using Serial.Println statement 4 times. How do I need to receive these values to 4 different variables in VB without using any buttons. We have to serial data received as per my knowledge.
I've written the following code in VB.
Imports System
Imports System.ComponentModel
Imports System.Threading
Imports System.IO.Ports
Public Class Form1
    Dim myPort As Array  'COM Ports detected on the system will be stored here
    Delegate Sub SetTextCallback(ByVal [text] As String) 'Added to prevent threading errors during receiveing of data
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        SerialPort1.PortName = "COM5"         'Set SerialPort1 to the selected COM port at startup
        SerialPort1.BaudRate = 9600         'Set Baud rate to the selected value on
        SerialPort1.Open()
        'Timer1.Start()
    End Sub
    Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
        ReceivedText(SerialPort1.ReadLine())    'Automatically called every time a data is received at the serialPort
    End Sub
    Private Sub ReceivedText(ByVal [text] As String)
        'compares the ID of the creating Thread to the ID of the calling Thread
        If Me.rtbReceived.InvokeRequired Then
            Dim x As New SetTextCallback(AddressOf ReceivedText)
            Me.Invoke(x, New Object() {(text)})
        Else
            Me.rtbReceived.Text &= [text]
        End If
    End Sub
End Class
How do I need to differentiate the values in ReceivedText function and How can I display those values in 4 text boxes. I am able to display all the values in rtbReceived text box as 100200300400100200300400... So on
Assume values from Arduino are 100, 200, 300 & 400
Your suggestions would be more helpful to complete my project, Thanks in Advance
Thanks,
Santhosh

Answer 1

How do I need to differentiate the values in ReceivedText function and How can I display those values in 4 text boxes. I am able to display all the values in rtbReceived text box as 100200300400100200300400... So on
Assume values from Arduino are 100, 200, 300 & 400
Based on the example you have provided you would simply use the String.Substring function to break the string apart ot every 4 characters.
https://msdn.microsoft.com/en-us/library/aka44szs%28v=vs.110%29.aspx
You could do that in a loop that changes the starting character position from 0 in an increment of 4.
However I suspect that won't work properly, either because there are characters that you are not revealing as a result of the way that you are display your results, or because your data gets out of sync. 
If your device sends synchronizing characters (such as an end-of-record byte, or perhaps just a CrLf) then the correct process is to append (not overwite) the text you receive.  Use a string, not a text box text property, for this buffer. Then you need
to break apart this buffer by scanning forward until you find a complete message - a record identifier and enough (12?) following characters to create a full sentence.  Then break it apart using substrings.
If your device data stream does not include something that marks the beginning or end of a complete transmission then you can still try breaking it apart every four characters, and see how reliable it is.