C#...GUI ..com 포트 전송 프로그래밍...

[김종록]

좋아요! 그러면 **WinForms GUI**로 COM 포트 통신 프로그램을 만드는 예제를 단계별로 만들어 드릴게요.
기본 기능은 다음과 같습니다:

* 연결 가능한 COM 포트 목록 표시 → 선택 후 연결/해제
* 송신용 텍스트박스 → 전송 버튼
* 수신 로그 표시 → 실시간 업데이트

---

## 1️⃣ WinForms GUI 기본 구성

1. **Form 디자인**

   * ComboBox → `comboBoxPorts` (포트 선택)
   * Button → `buttonConnect` (연결/해제)
   * TextBox → `textBoxSend` (보낼 데이터 입력)
   * Button → `buttonSend` (데이터 전송)
   * TextBox → `textBoxLog` (수신 로그, `Multiline = true`, `ScrollBars = Vertical`)

---

## 2️⃣ 코드 예제

```csharp
using System;
using Systehttp://m.IO.Ports;
using Systehttp://m.Windows.Forms;

namespace SerialPortGUI
{
    public partial class Form1 : Form
    {
        SerialPort serialPort = new SerialPort();

        public Form1()
        {
            InitializeComponent();
            LoadCOMPorts();
            serialPort.DataReceived += SerialPort_DataReceived;
        }

        private void LoadCOMPorts()
        {
            comboBoxPorts.Items.Clear();
            string[] ports = SerialPort.GetPortNames();
            comboBoxPorts.Items.AddRange(ports);
            if (ports.Length > 0)
                comboBoxPorts.SelectedIndex = 0;
        }

        private void buttonConnect_Click(object sender, EventArgs e)
        {
            try
            {
                if (!serialPort.IsOpen)
                {
                    serialPort.PortName = comboBoxPorts.Text;
                    serialPort.BaudRate = 9600;
                    serialPort.Parity = Parity.None;
                    serialPort.DataBits = 8;
                    serialPort.StopBits = StopBits.One;
                    serialPort.Handshake = Handshake.None;

                    serialPort.Open();
                    buttonConnect.Text = "Disconnect";
                    Log("포트 열림: " + serialPort.PortName);
                }
                else
                {
                    serialPort.Close();
                    buttonConnect.Text = "Connect";
                    Log("포트 닫힘");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("오류: " + ex.Message);
            }
        }

        private void buttonSend_Click(object sender, EventArgs e)
        {
            if (serialPort.IsOpen)
            {
                serialPort.WriteLine(textBoxSend.Text);
                Log("송신: " + textBoxSend.Text);
                textBoxSend.Clear();
            }
            else
            {
                MessageBox.Show("포트가 열려 있지 않습니다.");
            }
        }

        private void SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            string data = serialPort.ReadExisting();
            this.Invoke(new Action(() => Log("수신: " + data)));
        }

        private void Log(string message)
        {
            textBoxLog.AppendText(DateTime.Now.ToString("HH:mm:ss") + " - " + message + Environment.NewLine);
        }
    }
}
```

---

## 3️⃣ 기능 설명

1. **COM 포트 자동 로딩**

   * `SerialPort.GetPortNames()`로 현재 사용 가능한 포트 목록 가져오기

2. **연결/해제**

   * `serialPort.Open()` / `serialPort.Close()`
   * 버튼 텍스트 변경으로 상태 표시

3. **데이터 송신**

   * `WriteLine` 사용 → 수신 장치에서 줄바꿈 단위로 받음

4. **데이터 수신**

   * `DataReceived` 이벤트 → UI 업데이트는 `Invoke` 필요

5. **로그 표시**

   * `textBoxLog.AppendText`로 시간과 함께 송수신 표시

---

💡 **팁**

* BaudRate, Parity 등 통신 설정은 실제 장치에 맞춰 변경
* 실시간 수신 데이터가 많으면 TextBox 대신 **ListBox**나 **RichTextBox** 사용 추천

---

원하면 제가 이 예제를 **실시간 그래프 + 수신 로그 GUI**까지 확장해서, 장치 상태까지 한눈에 볼 수 있게 만들어 드릴 수도 있어요.

혹시 그쪽까지도 만들어 드릴까요?