c# 打开串口 SerialPort1.open()的问题

sjt3377 2009-03-03 08:53:36

c# 打开串口 SerialPort1.open()的问题提示无法支持请求。谁知道！！！！！

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sjt3377 2009-03-06

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用了MSCOMM32.ocx 就可以打开了。不是端口被占用

睡神在睡觉 2009-03-04

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同意楼上，检查你的端口是否被占用，或者你指定的端口是否存在

tigerleq 2009-03-04

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端口被占用

CraxyMouse 2009-03-03

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你可以参考一下这个!
还有检查一下你端口参数有没有设置正确
/******************************************************************
* Copyright(c) : Tangxu
* Description :
* CreateDate : 2006-9-01 04:53:08
* Creater : Tang.xu
* LastChangeDate:
* LastChanger :
* Version Info : 1.0.0
* ******************************************************************/
using System;
using System.IO.Ports;
using System.Threading;
using System.Text;

namespace Tangxu.Common
{
public class ReadCom
{
public ReadCom()
{
_ReadConfig = new ReadConfigure(System.Environment.CurrentDirectory + "\\Com_Info.xml");
}

public ReadCom(string sCom,int nBaud):this()
{

}

private byte[] _ReadBuffer;
private SerialPort ss_port = new SerialPort();
private static int nReadCount = 0;
private ReadConfigure _ReadConfig;

#region Initialize com port

public bool InitCom()//初始化建串口类实例
{
// return true;
try
{
ss_port.PortName = _ReadConfig.GetNodeValue("PORT");// _sComPort;
ss_port.BaudRate = int.Parse(_ReadConfig.GetNodeValue("BAUD"));//_nBaud;
ss_port.ReadBufferSize = 10240;
ss_port.DataBits = int.Parse(_ReadConfig.GetNodeValue("DATA"));//8;
switch (_ReadConfig.GetNodeValue("PARITY"))
{
case "None":
ss_port.Parity = Parity.None;
break;
case "Even":
ss_port.Parity = Parity.Even;
break;
case "Mark":
ss_port.Parity = Parity.Mark;
break;
case "Odd":
ss_port.Parity = Parity.Odd;
break;
case "Space":
ss_port.Parity = Parity.Mark;
break;
}
switch (_ReadConfig.GetNodeValue("STOP"))
{
case "1":
ss_port.StopBits = StopBits.One;
break;
case "1.5":
ss_port.StopBits = StopBits.OnePointFive;
break;
case "2":
ss_port.StopBits = StopBits.Two;
break;
}
ss_port.ReadTimeout = 600;
ss_port.WriteTimeout = 700;

ss_port.Open();//打开串口
return true;
}
catch (Exception ex)
{
throw new Exception("打开串口失败!\r\n错误信息:" + ex.Message);
}
}
#endregion

#region FreeDrv
/// <summary>
/// free opw
/// </summary>
public void FreeDrv()
{
try
{
if (ss_port != null)
{
ss_port.Close();
}
}
catch
{ }
}
#endregion

#region Write command to OPW
/// <summary>
/// 发操作命令给OPW设备
/// 并返回状态
/// </summary>
/// <param name="sCommand"> </param>
/// <returns> </returns>
public string WriteCommand(string sCommand)
{
StringBuilder sb = new StringBuilder();
bool bRead = true;
try
{
ss_port.DiscardInBuffer();
ss_port.Write(sCommand);
Thread.Sleep(1500);
while (bRead)
{
_ReadBuffer = new byte[ss_port.BytesToRead];
ss_port.Read(_ReadBuffer, 0, _ReadBuffer.Length);
sb.Append(Encoding.ASCII.GetString(_ReadBuffer));
Thread.Sleep(500);
if (ss_port.BytesToRead <= 0)
{
bRead= false;
}
}
if (sb.ToString().Length== 0)
{
nReadCount++;
}

if (nReadCount == 3)
{
nReadCount = 0;
throw new Exception("设置不正确或没有联接设备!");
}
}
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.ToString(); ;
}

public string WriteCommand(byte[] bCommand)
{
StringBuilder sb = new StringBuilder();
bool bRead = true;
try
{
ss_port.DiscardInBuffer();
ss_port.Write(bCommand,0,bCommand.Length);
Thread.Sleep(1500);
while (bRead)
{
_ReadBuffer = new byte[ss_port.BytesToRead];
ss_port.Read(_ReadBuffer, 0, _ReadBuffer.Length);
sb.Append(Encoding.ASCII.GetString(_ReadBuffer));
Thread.Sleep(500);
if (ss_port.BytesToRead <= 0)
{
bRead = false;
}
}
if (sb.ToString().Length == 0)
{
nReadCount++;
}

if (nReadCount == 3)
{
nReadCount = 0;
throw new Exception("设置不正确或没有联接设备!");
}
}
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.ToString();
}
#endregion

#region Get All COM Port
public string[] GetAllComPort()
{
string[] sAllPort = null;
try
{
sAllPort = SerialPort.GetPortNames();
}
catch (Exception ex)
{
throw new Exception("获取计算机COM口列表失败!\r\n错误信息:" + ex.Message);
}
return sAllPort;
}
#endregion
}

}

C# 通过COM端口读取数据 private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)

namespace 串口实例 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void btnSend_Click(object sender, EventArgs e) { //手动发送 SendMsg(); } private void SendMsg() { this.serialPort1.Write(this.txtSend.Text); } #region 控制输入数字 private void ComboBox_TextUpdate(object sender, EventArgs e) { ComboBox cbo = sender as ComboBox; int n; if (!int.TryParse(cbo.Text, out n)) { cbo.Text = cbo.Text.Substring(0, cbo.Text.Length - 1); } else { if (n <= 0) { cbo.Text = cbo.Text.Substring(0, cbo.Text.Length - 1); } } } private void txtTime_TextChanged(object sender, EventArgs e) { TextBox text = sender as TextBox; int n; if (!int.TryParse(text.Text, out n)) { text.Text = text.Text.Substring(0, text.Text.Length - 1); } else { if (n <= 0) { text.Text = text.Text.Substring(0, text.Text.Length - 1); } else { this.timer1.Interval = n; } } } #endregion ///

/// 清空显示文本框 ///

/// /// private void btnClear_Click(object sender, EventArgs e) { this.txtRecive.Clear(); } private void timer1_Tick(object sender, EventArgs e) { SendMsg(); } private void cbtSend_CheckedChanged(object sender, EventArgs e) { CheckBox check = sender as CheckBox; if (check.Checked) { this.timer1.Start(); } else { this.timer1.Stop(); } } ///

/// 接收返回的数据 ///