C#的串口读写问题

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;namespace RS232Test
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.RichTextBox richTextBoxReceive;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox textBoxSend;
private System.Windows.Forms.Button buttonSend;
private AxMSCommLib.AxMSComm axMSComm1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null; public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
InitComPort(); //
// TODO: Add any constructor code after InitializeComponent call
//
}
private void InitComPort()
{
// 设置端Com2
this.axMSComm1.CommPort = 2;

// 检查一下COM1是否使用了，若被使用了，把Com1关闭并从职.
if (this.axMSComm1.PortOpen)
this.axMSComm1.PortOpen = false;

// 设置当有数据进入缓冲区出发OnComm事件
this.axMSComm1.RThreshold = 1;

// 初始化设置
this.axMSComm1.Settings = "9600,n,8,1"; //强制DTR线路为高电位（一般用不上）
this.axMSComm1.DTREnable = true;

// 不使用握手协议（一般用不上）
this.axMSComm1.Handshaking = MSCommLib.HandshakeConstants.comNone; // 使用文字传输模式
this.axMSComm1.InputMode = MSCommLib.InputModeConstants.comInputModeText;


// 使用Input时为读取全部数据
this.axMSComm1.InputLen = 0; // 0x00为有效字节
this.axMSComm1.NullDiscard = false; //注册OnComm的时间处理函数

this.axMSComm1.OnComm += new System.EventHandler(this.axMSComm1_OnComm);// 註冊注册OnComm的事件處理函式

// 打开COM1
this.axMSComm1.PortOpen = true;
}
/*private void OnComm(object sender, EventArgs e)  //  MSCommLib OnComm Event Handler
{
//檢查緩衝區裏是否有資料，若有資料將資料傳給ProcessComData處理，當然您也可以直接在
//這個函式中處理，在此我們將資料轉字串的方式處理(string)，若是其他的資料，則轉為byte矩陣(byte [])。
if (this.axMSComm1.InBufferCount > 0)
ProcessComData((string) this.axMSComm1.Input);
}*/ private void ProcessComData(string input)
{

this.richTextBoxReceive.AppendText(input + "\n");
} /// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
} #region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
this.richTextBoxReceive = new System.Windows.Forms.RichTextBox();
this.label1 = new System.Windows.Forms.Label();
this.textBoxSend = new System.Windows.Forms.TextBox();
this.buttonSend = new System.Windows.Forms.Button();
this.axMSComm1 = new AxMSCommLib.AxMSComm();
((System.ComponentModel.ISupportInitialize)(this.axMSComm1)).BeginInit();
this.SuspendLayout();
//
// richTextBoxReceive
//
this.richTextBoxReceive.Location = new System.Drawing.Point(29, 30);
this.richTextBoxReceive.Name = "richTextBoxReceive";
this.richTextBoxReceive.Size = new System.Drawing.Size(461, 194);
this.richTextBoxReceive.TabIndex = 0;
this.richTextBoxReceive.Text = "";
//
// label1
//
this.label1.Location = new System.Drawing.Point(29, 7);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(182, 15);
this.label1.TabIndex = 1;
this.label1.Text = "所接受信息：";
//
// textBoxSend
//
this.textBoxSend.Location = new System.Drawing.Point(29, 246);
this.textBoxSend.Name = "textBoxSend";
this.textBoxSend.Size = new System.Drawing.Size(374, 21);
this.textBoxSend.TabIndex = 2;
this.textBoxSend.Text = "Let\'s go go go";
//
// buttonSend
//
this.buttonSend.Location = new System.Drawing.Point(413, 246);
this.buttonSend.Name = "buttonSend";
this.buttonSend.Size = new System.Drawing.Size(86, 23);
this.buttonSend.TabIndex = 3;
this.buttonSend.Text = "发送";
this.buttonSend.Click += new System.EventHandler(this.buttonSend_Click);
//
// axMSComm1
//
this.axMSComm1.Enabled = true;
this.axMSComm1.Location = new System.Drawing.Point(8, 80);
this.axMSComm1.Name = "axMSComm1";
this.axMSComm1.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("axMSComm1.OcxState")));
this.axMSComm1.Size = new System.Drawing.Size(38, 38);
this.axMSComm1.TabIndex = 4;
this.axMSComm1.OnComm += new System.EventHandler(this.axMSComm1_OnComm);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(512, 295);
this.Controls.Add(this.axMSComm1);
this.Controls.Add(this.buttonSend);
this.Controls.Add(this.textBoxSend);
this.Controls.Add(this.label1);
this.Controls.Add(this.richTextBoxReceive);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
((System.ComponentModel.ISupportInitialize)(this.axMSComm1)).EndInit();
this.ResumeLayout(false); }

#endregion /// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
} private void buttonSend_Click(object sender, System.EventArgs e)
{
this.axMSComm1.Output=this.textBoxSend.Text;
} private void axMSComm1_OnComm(object sender, System.EventArgs e)
{
if (this.axMSComm1.InBufferCount > 0)
ProcessComData((string) this.axMSComm1.Input);
}
public short FindDevicePort()
{
bool PortOkay = true;
short TestPort = 0;
bool found = false;  // 檢查所連接的裝置是否有回應(在此假設會回應Hi There)
// 不觸發OnComm事件
axMSComm1.RThreshold = 0;    // 檢查目前序列埠是否開始，若開啟將其關閉
if (axMSComm1.PortOpen)
axMSComm1.PortOpen = false;
do    {
TestPort++;  // 試下一個序列埠，本例測試Com1至Com4
PortOkay = true;
//試著存取TestPort所代表的這個序列埠(電腦上可能會沒這個序列埠^^)
try
{
axMSComm1.CommPort = TestPort;
}
catch (System.Runtime.InteropServices.COMException)
{
PortOkay = false;
}
if (PortOkay)  //如果序列埠存在okay的話
{            // 試著開啟序列埠(因為有可能會有其他程式開了呀^^)
try
{
axMSComm1.PortOpen = true;
}
catch (System.Runtime.InteropServices.COMException)
{
PortOkay = false;
}
if (PortOkay) // 如果這時序列埠也是okay的(電腦上有並且沒被使用)
{                axMSComm1.Output = "Hello?";
//送出個字串
long TimeStamp = DateTime.Now.Ticks;
//記得上面提到的跳離迴圈的機制嗎^^在這個例子中使用0.2秒來控制
string buffer = "";
bool ElapsedTime;
do                {                    //這是讓程式也能處理其他的訊息，別當住了.                    System.Windows.Forms.Application.DoEvents();                                        //如果緩衝區內有資料，將資料放至buffer變數內                    if (com.InBufferCount > 0) buffer += com.Input;
// 看連接的裝置是不是有傳回Hi There^^.
found = (buffer.IndexOf("Hi There") > -1);
// 看0.2秒到了沒^^
ElapsedTime = DateTime.Now.Ticks - TimeStamp >
TimeSpan.TicksPerSecond * 0.2;
// 迴圈一直執行，直到0.2秒到或者連接裝置有傳回Hi There
}
while (!ElapsedTime & !found);
}
}
}
while ((TestPort < 4) & !found);
// 傳回連接裝置所連接的序列埠
if (found) return TestPort;        // 沒連接裝置囉^^
return 0;
}
private void Form1_Load(object sender, System.EventArgs e)
{

}
}
}

建议你下载这个用：这个不涉及版权问题，而且做得不错，考虑了许多。
http://msdn.microsoft.com/msdnmag/issues/02/10/NETSerialComm/default.aspx

AxMSCommLib是哪里来的 private AxMSCommLib.AxMSComm axMSComm1;//using System.ComponentModel;

到www.GotDotNet.com上搜索SerialPort,你会找到一个很好的串口开发包,有源代码!

调试易

C#的串口读写问题

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