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Imports System.Text
Imports OpenNETCF.IO.Serial

Public Class Form1
  Dim MyPort As Port
  Dim IncomingData As String = ""

  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Me.Text = "Read GPS Sample"
    Button1.Text = "Open COM"
    Button2.Text = "Close COM"
    Button3.Text = "Exit"

    MyPort = New Port("COM7:") ' Εδώ βάλτε τη θύρα του GPS.

    MyPort.RThreshold = 1 ' get an event for every 1 byte received
    MyPort.InputLen = 1   ' calling Input will read 1 byte
    MyPort.SThreshold = 1 ' send 1 byte at a time

    Timer1.Enabled = True
  End Sub

  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Try
      TextBox1.Text = TextBox1.Text + vbCrLf + "Opening COM Port... "
      MyPort.Open()
      TextBox1.Text = TextBox1.Text + "OK!" + vbCrLf
    Catch ex As Exception
      TextBox1.Text = TextBox1.Text + vbCrLf + ex.Message + vbCrLf
    End Try

    If MyPort.IsOpen() Then TextBox1.Text = TextBox1.Text + vbCrLf + "COM Port is open!" + vbCrLf
  End Sub

  Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
    Try
      TextBox1.Text = TextBox1.Text + vbCrLf + "Closing COM Port... "
      MyPort.Close()
      TextBox1.Text = TextBox1.Text + "OK!" + vbCrLf
    Catch ex As Exception
      TextBox1.Text = TextBox1.Text + vbCrLf + ex.Message + vbCrLf
    End Try

    If Not MyPort.IsOpen() Then TextBox1.Text = TextBox1.Text + vbCrLf + "COM Port is closed!" + vbCrLf
  End Sub

  Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
    If MyPort.IsOpen() Then MyPort.Close()
    MyPort.Dispose()
    Application.Exit()
  End Sub

  Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
    If Not MyPort.IsOpen() Then Exit Sub

    Dim enc As Encoding = Encoding.ASCII 'Display as text
    Dim inputData As Byte() = New Byte(0) {}
    Dim I As Integer

    For I = 1 To MyPort.InBufferCount
      inputData = MyPort.Input 'Read the character
      IncomingData = IncomingData + enc.GetString(inputData, 0, inputData.Length)
    Next I
    If IncomingData <> "" Then
      Try
        TextBox1.Text = TextBox1.Text + IncomingData
        IncomingData = String.Empty
      Catch ex As Exception
        TextBox1.Text = TextBox1.Text + vbCrLf + ex.Message + vbCrLf
      End Try
    End If
    TextBox1.SelectionStart = TextBox1.Text.Length : TextBox1.ScrollToCaret() 'Scroll TextBox Down
  End Sub
End Class