c＃發送數據到comport

Question

我正在製作一個WindowsForm應用程序來模擬電錶的當前值。我不知道如何從文本框中獲取值並通過COM端口發送。 這是我得到的那一刻

namespace ValueSim1 
{ 
    public partial class Form1 : Form 
    { 
    public Form1() 
    { 
     InitializeComponent(); 
    } 

    private void Form1_Load(object sender, EventArgs e) 
    { 

    } 

    private void label1_Click(object sender, EventArgs e) 
    { 

    } 

    private void comboBox1_DropDown(object sender, EventArgs e) 
    { 
     // Get all serial ports name 
     string[] ports = SerialPort.GetPortNames(); 

     // Clear comboBox list to get latest serial ports in each dropdown. 
     comboBox1.Items.Clear(); 

     foreach (string port in ports) 
     { 
      // Output serial port to dropdown list. 
      comboBox1.Items.Add(port); 
     } 
    } 

    private static SerialPort serialPort1; 

    private void button1_Click(object sender, EventArgs e) 
    { 

     if (comboBox1.Text != "") 
     { 
      serialPort1.PortName = comboBox1.Text; //comboBox1.Text set to PortName 

      serialPort1.BaudRate = 19200; //Baudrate is set (fix.) 

      //if serial port has opened, it must be closed at first. 
      if (serialPort1.IsOpen == true) 
      { 
       serialPort1.Close(); 
      } 
      //open the serial port after confirmation serial port closed. 
      if (serialPort1.IsOpen == false) 
      { 
       serialPort1.Open(); 

       if (serialPort1.IsOpen == true) //message window shows serial port status. 
       { 
        MessageBox.Show("Open Success\n" + serialPort1.PortName.ToString() + " " + serialPort1.BaudRate.ToString()); 
       } 
       else 
       { 
        MessageBox.Show("COM Port error"); 
       } 
      } 
     } 
    } 

    private void groupBox1_Enter(object sender, EventArgs e) 
    { 

    } 

    private void textBox5_TextChanged(object sender, EventArgs e) 
    { 

    } 

    private void textBox1_TextChanged(object sender, EventArgs e) 
    { 

    } 
    } 
} 

Answer 1

見SerialPort類的文檔中的代碼：https://msdn.microsoft.com/en-us/library/system.io.ports.serialport(v=vs.110).aspx

有一個寫（string）方法，所以

serialPort1.Write(comboBox1.Text); 

應該工作 見https://msdn.microsoft.com/en-us/library/y2sxhat8(v=vs.110).aspx

Answer 2

使用 SerialPort1.WriteLine(string); e.g

 SerialPort1.WriteLine(textBox1.Text); 

還有其他過載，其可以使用的Write()和WriteLine()方法。確保您正確閱讀文檔。

here is a link to the microsoft documentation for the serial port class

嘗試讀它，你的代碼。