public partial class Form1 : Form
{
//SerialPort sp1 = new SerialPort();//声明一个串口类
bool isOpen = false;//打开串口标志位
bool isSetProperty = false;//属性设置标志位
bool isHex = false;//十六进制显示标志位
public Form1()
{
//sp1.DataReceived += new SerialDataReceivedEventHandler(sp1_DataReceived);
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
this.MaximumSize = this.Size;
this.MinimumSize = this.Size;
this.MaximizeBox = false;
for (int i = 1; i <= 10; i++) //假设最大支持到串口10
{
cbxCOMPort.Items.Add("COM" + i);
}
cbxCOMPort.SelectedIndex = 0;//设当前指点选项的索引值为0
//列出常用波特率
cbxBaudRate.Items.Add("1200");
cbxBaudRate.Items.Add("2400");
cbxBaudRate.Items.Add("4800");
cbxBaudRate.Items.Add("9600");
cbxBaudRate.Items.Add("19200");
cbxBaudRate.Items.Add("38400");
cbxBaudRate.Items.Add("43000");
cbxBaudRate.Items.Add("56000");
cbxBaudRate.Items.Add("57600");
cbxBaudRate.Items.Add("115200");
cbxBaudRate.SelectedIndex = 3;
//列出停止位
//cbxStopBits.Items.Add("0");
cbxStopBits.Items.Add("1");
cbxStopBits.Items.Add("1.5");
cbxStopBits.Items.Add("2");
cbxStopBits.SelectedIndex = 0;
//列出奇偶校验位
cbxParity.Items.Add("无");
cbxParity.Items.Add("奇校验");
cbxParity.Items.Add("偶校验");
cbxParity.SelectedIndex = 0;
//列出数据位
cbxDataBits.Items.Add("8");
cbxDataBits.Items.Add("7");
cbxDataBits.Items.Add("6");
cbxDataBits.Items.Add("5");
cbxDataBits.SelectedIndex = 0;
//默认为char显示
rbnChar.Checked = true;
}
private void btnCheckCOM_Click(object sender, EventArgs e)
{
bool comExistence = false;//有可用串口标志位
cbxCOMPort.Items.Clear();//清楚当前串口号中的所有串口名称
for (int i = 1; i <= 10; i++)
{
try
{
//SerialPort sp= new SerialPort("COM" + i); //实例化端口
sp1 = new SerialPort("COM" + i);
sp1.Open();
sp1.Close();
cbxCOMPort.Items.Add("COM" + i);
comExistence = true;
}
catch
{
continue;
}
}
if (comExistence)
{
cbxCOMPort.SelectedIndex = 0; //显示第一个添加的索引
}
else
{
MessageBox.Show("没有找到可用串口！", "错误提示");//“错误提示”显示在标题栏，“没找到串口”为显示文本
}
}
//检查串口是否设置
private bool CheckPortSetting()
{
if (cbxCOMPort.Text.Trim() == "") return false;
if (cbxBaudRate.Text.Trim() == "") return false;
if (cbxDataBits.Text.Trim() == "") return false;
if (cbxParity.Text.Trim() == "") return false;
if (cbxDataBits.Text.Trim() == "") return false;
else return true;
}
private bool CheckSendData()
{
if (tbxSendData.Text.Trim() == "") return false;
else return true;
}
//设置串口的属性
private void SetPortProperty()
{
sp1.PortName = cbxCOMPort.Text.Trim(); //设置串口名
sp1.BaudRate = Convert.ToInt32(cbxBaudRate.Text.Trim());//设置串口的波特率
float f = Convert.ToSingle(cbxStopBits.Text.Trim());//将数字的制定字符串表示形式转换为等效的单精度浮点数
if (f == 0)
{
sp1.StopBits = StopBits.None;
}
else if (f == 1.5)
{
sp1.StopBits = StopBits.OnePointFive;
}
else if (f == 2)
{
sp1.StopBits = StopBits.Two;
}
else
{
sp1.StopBits = StopBits.One;
}
sp1.DataBits = Convert.ToInt16(cbxDataBits.Text.Trim());//设置数据位
string s = cbxParity.Text.Trim(); //设置奇偶校验位
if (s.CompareTo("无") == 0) //与字符串是否在同一位置，在前面，还是在后面
{
sp1.Parity = Parity.None;
}
else if (s.CompareTo("奇校验") == 0)
{
sp1.Parity = Parity.Odd;
}
else if (s.CompareTo("偶校验") == 0)
{
sp1.Parity = Parity.Even;
}
else
{
sp1.Parity = Parity.None;
}
sp1.ReadTimeout = -1;//设置超时读取时间
sp1.RtsEnable = true;//该值指示在串行通信中是否启用请求发送（RTS）信号
//定义DataReceived事件，当串口收到数据后触发事件
}
//定义DataReceived事件，当串口收到数据后触发事件
public void sp1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
sp1.DataReceived += new SerialDataReceivedEventHandler(sp1_DataReceived);
//this.Invoke就是跨线程访问ui的方法
this.Invoke((EventHandler)(delegate
{
if (rbnHex.Checked)
{
isHex = true;
}
else
{
isHex = false;
}
if (isHex == false)
{
tbxRecvData.Text += sp1.ReadLine();
}
else
{
Byte[] ReceiveData = new Byte[sp1.BytesToRead];//创建字节数组
sp1.Read(ReceiveData, 0, ReceiveData.Length); //读取所接收到的数据
string RecvDataText = null;
for (int i = 0; i < ReceiveData.Length; i++)
{
RecvDataText += ("0x" + ReceiveData[i].ToString("X2") + " ");//X为十六进制 2为每次都是两位数 这样看着整齐
}
tbxRecvData.Text += RecvDataText;
}
sp1.DiscardInBuffer();//丢弃接收缓冲区的数据
}));
}
private void btnSend_Click(object sender, EventArgs e)
{
//写串口数据
if (isOpen)
{
try
{
sp1.WriteLine(tbxSendData.Text);
}
catch
{
MessageBox.Show("发送数据时发生错误！", "错误提示");
return;
}
}
else
{
MessageBox.Show("串口未打开！", "错误提示");
return;
}
//检测要发送的数据
if (!CheckSendData())
{
MessageBox.Show("请输入要发送的数据！", "错误提示");
return;
}
}
private void btnOpenCOM_Click(object sender, EventArgs e)
{
if (isOpen == false)
{
if (!CheckPortSetting())
{
MessageBox.Show("串口未设置！", "错误提示");
return;
}
if (!isSetProperty)//串口未设置则设置串口
{
SetPortProperty();
isSetProperty = true;
}
try//打开串口
{
sp1.Open();
isOpen = true;
btnOpenCOM.Text = "关闭串口";
//串口打开后则相关的串口设置按钮便不可再用
cbxCOMPort.Enabled = false;
cbxBaudRate.Enabled = false;
cbxDataBits.Enabled = false;
cbxParity.Enabled = false;
cbxStopBits.Enabled = false;
rbnChar.Enabled = false;
rbnHex.Enabled = false;
}
catch
{
//打开串口失败后，相应标志位取消
isSetProperty = false;
isOpen = false;
MessageBox.Show("串口无效或已被占用！", "错误提示");
}
}
else
{
try //打开串口
{
sp1.Close();
isOpen = false;
isSetProperty = false;
btnOpenCOM.Text = "打开串口";
//关闭串口后，串口设置选项便可以继续使用
cbxCOMPort.Enabled = true;
cbxBaudRate.Enabled = true;
cbxDataBits.Enabled = true;
cbxParity.Enabled = true;
cbxStopBits.Enabled = true;
rbnChar.Enabled = true;
rbnHex.Enabled = true;
}
catch
{
MessageBox.Show("关闭串口时发生错误！", "错误提示");
}
}
}
private void btnCleanData_Click(object sender, EventArgs e)
{
tbxRecvData.Text = "";
tbxSendData.Text = "";
tbxSendData.Focus();
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
System.Environment.Exit(0);
}
