关于VS2005 串口通讯的问题 另求.netQQ群

Question

小弟现在急需做一个串口通讯的项目 请大家帮帮忙我现在要向一个显示屏输出字符 并且还要接收串口回来的数据 请问在vs2005中应怎么使用 Serialport 另求QQ群

Answer 1

这位兄弟，下面的是VB.Net编写的SerialPort通信程序，请参考一下。
Public Class Form1    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Try
            If Button1.Text.StartsWith("Open") Then
                Button1.Text = "Close"
                SP1.NewLine = vbCrLf
                SP1.Open()
                Button1.ForeColor = Color.Red
            Else
                Button1.Text = "Open"
                SP1.Close()
                Button1.ForeColor = Color.Green
            End If
        Catch ex As Exception
            MessageBox.Show(ex.Message, Text)
        End Try
    End Sub    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        txtRead.Clear()
        Try
            SP1.WriteLine(txtSend.Text.Trim)
        Catch ex As Exception
            MessageBox.Show(ex.Message, Text)
        End Try
    End Sub
    Private Delegate Sub SetText(ByVal strText As String)
    Private Sub SP1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SP1.DataReceived
        Try
            'txtRead.Text = String.Concat(txtRead.Text, SP1.ReadExisting)
            Call ReadText(SP1.ReadExisting)
        Catch ex As Exception
            MessageBox.Show(ex.Message, Text)
        End Try
    End Sub
    Private Sub ReadText(ByVal txt As String)
        If txtRead.InvokeRequired Then
            Me.Invoke(New SetText(AddressOf ReadText), txt)
        Else
            txtRead.Text = String.Concat(txtRead.Text, txt)
        End If
    End Sub
End Class

Answer 2

DataReceived事件过程用来接收来自串口的数据

Answer 3

如果你装了MSDN2005就拖一个 Serialport 控件到然后按F1就很清楚了
主要是如下几个属性和事件搞清楚就可以了
1，DataReceived事件接受数据，
2，ReceivedBytesThreshold是设置接收到几个字符来触发DataReceived事件
3，read()来读缓冲区的数据，READ有很多种读的方式（详细看MSDN）
4，Write()用来往发送缓冲区写数据，Write也有很多中方式（详细看MSDN）

Answer 4

写已经搞定了 但是读不出来  我是这么写的byte[] a=new byte[50];
Serialport1.read(a,0,50);
string b=a.tostring();
textbox1.text=b; 这里出错 提示线程间操作无效;从不是创建控件"textbox1"的线程访问它

Answer 5

byte[] by = new byte[128];
                    
                    if (!sp.IsOpen)
                    {
                        sp.Open();
                    }                    Thread.Sleep(200);                    sp.Read(by, 0, by.Length);                    string instring = Encoding.ASCII.GetString(by);                    this.textBox3.Text = instring;

Answer 6

form constrol function add :
 Control.CheckForIllegalCrossThreadCalls = false;
com read (.net 2.0 SerialPort)
 public string WriteCommand(string sCommand)
        {
            string sb = string.Empty;
            try
            {
                ss_port.DiscardInBuffer();
                ss_port.Write(sCommand);
                Thread.Sleep(1500);
                _ReadBuffer = new byte[ss_port.BytesToRead];
                if (_ReadBuffer.Length > 0)
                    ss_port.Read(_ReadBuffer, 0, _ReadBuffer.Length);
                else
                {
                    nReadCount++;
                }                if (nReadCount == 3)
                {
                    nReadCount = 0;
                    throw new Exception("设置不正确或没有联接设备!");
                }
                sb = Encoding.ASCII.GetString(_ReadBuffer);
            }
            catch (Exception ex)
            {
                throw new Exception("从设备获取数据失败!\r\n错误信息:" + ex.Message);
            }
            return sb;
        }

Answer 7

#region Construct
        public frmMain()构造函数
        {
            this.Hide();
            this.Enabled = false;
            InitializeComponent();
            nfOpw.Visible = false;
            Control.CheckForIllegalCrossThreadCalls = false;
        }
        #endregion