[C#/WINFORM] RichTextBox 클래스 : 이미지 캡처하기

■ RichTextBox 클래스에서 이미지를 캡처하는 방법을 보여준다.

TestProject.zip

다운로드

▶ MainForm.cs

using System;
using System.Drawing;
using System.Windows.Forms;

namespace TestProject
{
    /// <summary>
    /// 메인 폼
    /// </summary>
    public partial class MainForm : Form
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainForm()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainForm()
        {
            InitializeComponent();

            Load                     += Form_Load;
            this.captureButton.Click += captureButton_Click;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private
        //////////////////////////////////////////////////////////////////////////////// Event

        #region 폼 로드시 처리하기 - Form_Load(sender, e)

        /// <summary>
        /// 폼 로드시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void Form_Load(object sender, EventArgs e)
        {
            this.richTextBox.Text = "Outside of a dog, a book is man's best friend. Inside of a dog it's too dark to read.";

            this.richTextBox.Select(18, 27);
            this.richTextBox.SelectionColor = Color.Blue;

            this.richTextBox.Select(20, 4);
            this.richTextBox.SelectionFont = new Font(richTextBox.Font, FontStyle.Italic);

            this.richTextBox.Select(63, 21);
            this.richTextBox.SelectionColor = Color.Red;
            this.richTextBox.SelectionFont  = new Font(richTextBox.Font, FontStyle.Bold);

            this.richTextBox.Select(0, 0);
        }

        #endregion
        #region Capture 버튼 클릭시 처리하기 - captureButton_Click(sender, e)

        /// <summary>
        /// Capture 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void captureButton_Click(object sender, EventArgs e)
        {
            this.pictureBox.Image = GetBitmap(this.richTextBox);
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////// Function

        #region 비트맵 구하기 - GetBitmap(richTextBox)

        /// <summary>
        /// 비트맵 구하기
        /// </summary>
        /// <param name="richTextBox">리치 텍스트 박스</param>
        /// <returns>비트맵</returns>
        private Bitmap GetBitmap(RichTextBox richTextBox)
        {
            this.richTextBox.Update();

            int width  = this.richTextBox.ClientSize.Width;
            int height = this.richTextBox.ClientSize.Height;

            Bitmap bitmap = new Bitmap(width, height);

            using(Graphics graphics = Graphics.FromImage(bitmap))
            {
                graphics.CopyFromScreen
                (
                    this.richTextBox.PointToScreen(new Point(0, 0)),
                    new Point(0, 0),
                    richTextBox.ClientSize
                );
            }

            return bitmap;
        }

        #endregion
    }
}