Question

我试图让VB.net显示数据＆＃34;颜色＆＃34;来自我的Arduino，我的串口工作得很好但我每次都按下连接和按键进行按摩奇怪的数据显示了

An unhandled exception of type 'System.InvalidCastException' occurred in Microsoft.VisualBasic.dll

Additional information: Conversion from string " = " to type 'Integer' is not valid.

有人可以帮助我吗？这是我的代码

Public Class Form1
    Private _msg As String
    Dim R As String
    Dim G As String
    Dim B As String

    Dim iR As String
    Dim iG As String
    Dim iB As String

    Private indata As String
    Dim IsConnected As Boolean

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For Each str As String In IO.Ports.SerialPort.GetPortNames()
            Ports.Items.Add(str)
        Next
        If (Ports.Items.Count > 0) Then
            Ports.SelectedIndex = 0
        End If
        IsConnected = False
        Status.Text = "Disconnected"
        Status.BackColor = Color.MistyRose
        Button1.Enabled = True
        Button2.Enabled = False
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If (SerialPort1.IsOpen()) Then

            Try
                SerialPort1.Close()
            Catch ex As Exception
                MsgBox(ex.Message)
            End Try


            IsConnected = False
            Status.Text = "Disconnected"
            Status.BackColor = Color.MistyRose
            Button1.Enabled = True
            Button2.Enabled = False
        End If
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If (SerialPort1.IsOpen = False) Then
            SerialPort1.PortName = Ports.SelectedItem
            SerialPort1.Open()
            IsConnected = True
            Status.Text = "Connected"
            Status.BackColor = Color.LightGreen
            Button1.Enabled = False
            Button2.Enabled = True
        End If
    End Sub



    Private Sub SerialPort1_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
        'user chose string
        'read data waiting in the buffer
        Try
            Dim msg As String = SerialPort1.ReadExisting()

            indata = indata + msg
            'Dim where As Integer = InStr(indata, ControlChars.Lf)
            Dim where As Integer = InStr(indata, "R=")
            If (indata.Length > where + 18) Then
                R = indata.Substring(where + 1, 3)
                G = indata.Substring(where + 7, 3)
                B = indata.Substring(where + 13, 3)
                indata = ""
            End If

            'display the data to the user
            _msg = msg
            _msg = _msg.Replace(ControlChars.Cr, "")
            : DisplayData(msg)
        Catch ex As Exception

        End Try


    End Sub

#Region "DisplayData"
    ''' <summary>
    ''' Method to display the data to and
    ''' from the port on the screen
    ''' </summary>
    ''' <remarks></remarks>
    <STAThread()> _
    Private Sub DisplayData(ByVal msg As String)
        DisplayWindow.BeginInvoke(New EventHandler(AddressOf DoDisplay))
    End Sub
#End Region

#Region "DoDisplay"
    Private Sub DoDisplay(ByVal sender As Object, ByVal e As EventArgs)
        'DisplayWindow.SelectedText = String.Empty
        'DisplayWindow.SelectionFont = New Font(_DisplayWindow.SelectionFont, FontStyle.Bold)
        'DisplayWindow.SelectionColor = MessageColor(CType(_type, Integer))
        DisplayWindow.AppendText(_msg)
        DisplayWindow.ScrollToCaret()
    End Sub
#End Region

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        RL.Text = R
        GL.Text = G
        BL.Text = B

        iR = CInt(R) * CInt(RM.Text)
        iG = CInt(G) * CInt(GM.Text)
        iB = CInt(B) * CInt(BM.Text)

        RF.Text = iR
        GF.Text = iG
        BF.Text = iB

        Try
            Label6.BackColor = Color.FromArgb(CType(iR, Byte), CType(iG, Byte), CType(iB, Byte))
        Catch ex As Exception

        End Try

    End Sub

    Private Sub LinkLabel1_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs)
        System.Diagnostics.Process.Start("http://www.narzan.weebly.com/p-1049.html")
    End Sub

    Private Sub LinkLabel1_LinkClicked_1(sender As Object, e As LinkLabelLinkClickedEventArgs)

    End Sub

    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
        picOn.Visible = True
        SerialPort1.Open()
        SerialPort1.Write("^")
        SerialPort1.Close()
    End Sub

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        picOn.Visible = False
        SerialPort1.Open()
        SerialPort1.Write("<")
        SerialPort1.Close()
    End Sub

    Private Sub picOn_Click(sender As Object, e As EventArgs) Handles picOn.Click

    End Sub

    Private Sub RL_Click(sender As Object, e As EventArgs) Handles RL.Click

    End Sub

    Private Sub RM_TextChanged(sender As Object, e As EventArgs) Handles RM.TextChanged

    End Sub
End Class

Answer 1

我的问题来自我的Arduino代码而不是来自VB.net 解决方案是从R，G，B中删除“=”

void printColour(){
Serial.print("R = ");
Serial.println(int(colourArray[0]));
Serial.print("G = ");
Serial.println(int(colourArray[1]));
Serial.print("B = ");
Serial.println(int(colourArray[2]));
//delay(2000);
}

因此代码看起来像那样

  void printColour(){
    Serial.print("");
    Serial.println(int(colourArray[0]));
    Serial.print("");
    Serial.println(int(colourArray[1]));
    Serial.print("");
    Serial.println(int(colourArray[2]));
    //delay(2000);
    }

谢谢大家，现在一切都很顺利

VB.net RGB颜色传感器＆＃34;整数无效＆＃34;

1 个答案: