namespace SerialAssistant
{
public partial class Form1 : Form
{
private long receive_count = 0; //接收字节计数
private long send_count = 0; //发送字节计数
private StringBuilder sb = new StringBuilder(); //为了避免在接收处理函数中反复调用，依然声明为一个全局变量
private DateTime current_time = new DateTime(); //为了避免在接收处理函数中反复调用，依然声明为一个全局变量
private StringBuilder builder = new StringBuilder(); //避免在事件处理方法中反复创建，定义为全局
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
int i;
//单个添加
for (i = 300; i <= 38400; i = i*2)
{
comboBox2.Items.Add(i.ToString()); //添加波特率列表
}
//批量添加波特率列表
string[] baud = { "43000","56000","57600","115200","128000","230400","256000","460800" };
comboBox2.Items.AddRange(baud);
//获取电脑当前可用串口并添加到选项列表中
comboBox1.Items.AddRange(System.IO.Ports.SerialPort.GetPortNames());
//设置选项默认值
comboBox2.Text = "115200";
comboBox3.Text = "8";
comboBox4.Text = "None";
comboBox5.Text = "1";
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
try
{
//将可能产生异常的代码放置在try块中
//根据当前串口属性来判断是否打开
if (serialPort1.IsOpen)
{
//串口已经处于打开状态
serialPort1.Close(); //关闭串口
button1.Text = "打开串口";
button1.BackColor = Color.ForestGreen;
comboBox1.Enabled = true;
comboBox2.Enabled = true;
comboBox3.Enabled = true;
comboBox4.Enabled = true;
comboBox5.Enabled = true;
label6.Text = "串口已关闭";
label6.ForeColor = Color.Red;
button2.Enabled = false; //失能发送按钮
}
else
{
//串口已经处于关闭状态，则设置好串口属性后打开
comboBox1.Enabled = false;
comboBox2.Enabled = false;
comboBox3.Enabled = false;
comboBox4.Enabled = false;
comboBox5.Enabled = false;
serialPort1.PortName = comboBox1.Text;
serialPort1.BaudRate = Convert.ToInt32(comboBox2.Text);
serialPort1.DataBits = Convert.ToInt16(comboBox3.Text);
if (comboBox4.Text.Equals("None"))
serialPort1.Parity = System.IO.Ports.Parity.None;
else if(comboBox4.Text.Equals("Odd"))
serialPort1.Parity = System.IO.Ports.Parity.Odd;
else if (comboBox4.Text.Equals("Even"))
serialPort1.Parity = System.IO.Ports.Parity.Even;
else if (comboBox4.Text.Equals("Mark"))
serialPort1.Parity = System.IO.Ports.Parity.Mark;
else if (comboBox4.Text.Equals("Space"))
serialPort1.Parity = System.IO.Ports.Parity.Space;
if (comboBox5.Text.Equals("1"))
serialPort1.StopBits = System.IO.Ports.StopBits.One;
else if (comboBox5.Text.Equals("1.5"))
serialPort1.StopBits = System.IO.Ports.StopBits.OnePointFive;
else if (comboBox5.Text.Equals("2"))
serialPort1.StopBits = System.IO.Ports.StopBits.Two;
serialPort1.Open(); //打开串口
button1.Text = "关闭串口";
button1.BackColor = Color.Firebrick;
label6.Text = "串口已打开";
label6.ForeColor = Color.Green;
button2.Enabled = true; //使能发送按钮
checkBox2.Enabled = true;
}
}
catch (Exception ex)
{
//捕获可能发生的异常并进行处理
//捕获到异常，创建一个新的对象，之前的不可以再用
serialPort1 = new System.IO.Ports.SerialPort();
//刷新COM口选项
comboBox1.Items.Clear();
comboBox1.Items.AddRange(System.IO.Ports.SerialPort.GetPortNames());
//响铃并显示异常给用户
System.Media.SystemSounds.Beep.Play();
button1.Text = "打开串口";
button1.BackColor = Color.ForestGreen;
MessageBox.Show(ex.Message);
comboBox1.Enabled = true;
comboBox2.Enabled = true;
comboBox3.Enabled = true;
comboBox4.Enabled = true;
comboBox5.Enabled = true;
checkBox2.Enabled = false;
}
}
private void button2_Click(object sender, EventArgs e)
{
byte[] temp = new byte[1];
try
{
//首先判断串口是否开启
if (serialPort1.IsOpen)
{
int num = 0; //获取本次发送字节数
//串口处于开启状态，将发送区文本发送
//判断发送模式
if (radioButton4.Checked)
{
//以HEX模式发送
//首先需要用正则表达式将用户输入字符中的十六进制字符匹配出来
string buf = textBox_send.Text;
string pattern = @"\s";
string replacement = "";
Regex rgx = new Regex(pattern);
string send_data = rgx.Replace(buf, replacement);
//不发送新行
num = (send_data.Length - send_data.Length % 2) / 2;
for (int i = 0; i < num; i++)
{
temp[0] = Convert.ToByte(send_data.Substring(i * 2, 2), 16);
serialPort1.Write(temp, 0, 1); //循环发送
}
//如果用户输入的字符是奇数，则单独处理
if (send_data.Length % 2 != 0)
{
temp[0] = Convert.ToByte(send_data.Substring(textBox_send.Text.Length-1,1), 16);
serialPort1.Write(temp, 0, 1);
num++;
}
//判断是否需要发送新行
if (checkBox3.Checked)
{
//自动发送新行
serialPort1.WriteLine("");
}
}
else
{
//以ASCII模式发送
//判断是否需要发送新行
if (checkBox3.Checked)
{
//自动发送新行
serialPort1.WriteLine(textBox_send.Text);
num = textBox_send.Text.Length + 2; //回车占两个字节
}
else
{
//不发送新行
serialPort1.Write(textBox_send.Text);
num = textBox_send.Text.Length;
}
}
send_count += num; //计数变量累加
label8.Text = "Tx:" + send_count.ToString() + "Bytes"; //刷新界面
}
}
catch (Exception ex)
{
serialPort1.Close();
//捕获到异常，创建一个新的对象，之前的不可以再用
serialPort1 = new System.IO.Ports.SerialPort();
//刷新COM口选项
comboBox1.Items.Clear();
comboBox1.Items.AddRange(System.IO.Ports.SerialPort.GetPortNames());
//响铃并显示异常给用户
System.Media.SystemSounds.Beep.Play();
button1.Text = "打开串口";
button1.BackColor = Color.ForestGreen;
MessageBox.Show(ex.Message);
comboBox1.Enabled = true;
comboBox2.Enabled = true;
comboBox3.Enabled = true;
comboBox4.Enabled = true;
comboBox5.Enabled = true;
checkBox2.Enabled = false;
}
}
//串口接收事件处理
private void SerialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
int num = serialPort1.BytesToRead; //获取接收缓冲区中的字节数
byte[] received_buf = new byte[num]; //声明一个大小为num的字节数据用于存放读出的byte型数据
receive_count += num; //接收字节计数变量增加nun
serialPort1.Read(received_buf,0,num); //读取接收缓冲区中num个字节到byte数组中
sb.Clear(); //防止出错,首先清空字符串构造器
if (radioButton2.Checked)
{
//选中HEX模式显示
foreach (byte b in received_buf)
{
sb.Append(b.ToString("X2") + ' '); //将byte型数据转化为2位16进制文本显示，并用空格隔开
}
}
else
{
//选中ASCII模式显示
sb.Append(Encoding.ASCII.GetString(received_buf)); //将整个数组解码为ASCII数组
}
try
{
//因为要访问UI资源，所以需要使用invoke方式同步ui
Invoke((EventHandler)(delegate
{
if (checkBox1.Checked)
{
//显示时间
current_time = System.DateTime.Now; //获取当前时间
textBox_receive.AppendText(current_time.ToString("HH:mm:ss") + " " + sb.ToString());
}
else
{
//不显示时间
textBox_receive.AppendText(sb.ToString());
}
label7.Text = "Rx:" + receive_count.ToString() + "Bytes";
}
)
);
}
catch (Exception ex)
{
//响铃并显示异常给用户
System.Media.SystemSounds.Beep.Play();
MessageBox.Show(ex.Message);
}
}
private void button3_Click(object sender, EventArgs e)
{
textBox_receive.Text = ""; //清空接收文本框
textBox_send.Text = ""; //清空发送文本框
receive_count = 0; //接收计数清零
send_count = 0; //发送计数
label7.Text = "Rx:" + receive_count.ToString() + "Bytes"; //刷新界面
label8.Text = "Tx:" + send_count.ToString() + "Bytes"; //刷新界面
}
private void checkBox2_CheckedChanged(object sender, EventArgs e)
{
if (checkBox2.Checked)
{
//自动发送功能选中,开始自动发送
numericUpDown1.Enabled = false; //失能时间选择
timer1.Interval = (int)numericUpDown1.Value; //定时器赋初值
timer1.Start(); //启动定时器
label6.Text = "串口已打开" + " 自动发送中...";
}
else
{
//自动发送功能未选中,停止自动发送
numericUpDown1.Enabled = true; //使能时间选择
timer1.Stop(); //停止定时器
label6.Text = "串口已打开";
}
}
private void timer1_Tick(object sender, EventArgs e)
{
//定时时间到
button2_Click(button2, new EventArgs()); //调用发送按钮回调函数
}
}
}
组件方式没法看出问题，你找个com调试工具看看你程序启动后占用的端口，使用调试工具是否还能打开？然后在com数据接收事件里加showmessage看看是否收到数据，在调试模式下有时因为数据缓冲问题设定的断点可能不会次次生效