What are the methods for serial communication in C#?

2 years ago
Olivia Parker
2 minutes

In C#, serial communication can be achieved using the following methods:

  1. Utilize the SerialPort class in the System.IO.Ports namespace: This class offers various methods and properties for opening, closing, reading, and writing serial port data. You can use the SerialPort class for basic serial communication.
using System;
using System.IO.Ports;

class Program
{
    static void Main(string[] args)
    {
        SerialPort serialPort = new SerialPort("COM1", 9600); // 创建串口对象
        serialPort.Open(); // 打开串口

        // 读取串口数据
        string data = serialPort.ReadLine();
        Console.WriteLine(data);

        // 向串口发送数据
        serialPort.WriteLine("Hello, World!");

        // 关闭串口
        serialPort.Close();

        Console.ReadLine();
    }
}
  1. You can also use Windows API functions for serial communication. For example, you can use the CreateFile function to open the serial port, the ReadFile function to read data, the WriteFile function to write data, and the CloseHandle function to close the serial port.
using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("kernel32.dll", SetLastError = true)]
    static extern IntPtr CreateFile(string lpFileName, uint dwDesiredAccess, uint dwShareMode, IntPtr lpSecurityAttributes, uint dwCreationDisposition, uint dwFlagsAndAttributes, IntPtr hTemplateFile);

    [DllImport("kernel32.dll")]
    static extern bool ReadFile(IntPtr hFile, byte[] lpBuffer, uint nNumberOfBytesToRead, out uint lpNumberOfBytesRead, IntPtr lpOverlapped);

    [DllImport("kernel32.dll")]
    static extern bool WriteFile(IntPtr hFile, byte[] lpBuffer, uint nNumberOfBytesToWrite, out uint lpNumberOfBytesWritten, IntPtr lpOverlapped);

    [DllImport("kernel32.dll", SetLastError = true)]
    static extern bool CloseHandle(IntPtr hObject);

    static void Main(string[] args)
    {
        IntPtr serialPort = CreateFile("COM1", 0x80000000, 0, IntPtr.Zero, 3, 0, IntPtr.Zero); // 打开串口

        byte[] buffer = new byte[255];
        uint bytesRead;
        ReadFile(serialPort, buffer, (uint)buffer.Length, out bytesRead, IntPtr.Zero); // 读取串口数据

        Console.WriteLine(System.Text.Encoding.Default.GetString(buffer));

        WriteFile(serialPort, System.Text.Encoding.Default.GetBytes("Hello, World!"), 13, out _, IntPtr.Zero); // 向串口发送数据

        CloseHandle(serialPort); // 关闭串口

        Console.ReadLine();
    }
}

All of these methods can be used to achieve serial communication. You can choose one that suits your needs.

bannerAds