using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.IO;

 

namespace ImageToIcon

{

  public partial class ImageToIcon : Form

  {

    Stream myStream;

    public ImageToIcon()

    {

      InitializeComponent();

    }

 

// 파일을 열어서

// 썸네일 추출

    private void btnOpenImage_Click(object sender, EventArgs e)

    {

 

      if (ofdPicture.ShowDialog() == DialogResult.OK)

      {

        if ((myStream = ofdPicture.OpenFile()) != null)

        {

          Image image = Image.FromFile(ofdPicture.FileName);

          Image newImage = image.GetThumbnailImage(32, 32, null, new IntPtr());

          txtImagePath.Text = ofdPicture.FileName;

          pbImage.Image = newImage;

        }

      }

    }

 

// 썸네일을 아이콘으로 저장

    private void btnSaveAsIcon_Click(object sender, EventArgs e)

    {

      if (sfdPicture.ShowDialog() == DialogResult.OK)

      {

        String fileName = sfdPicture.FileName;

        Stream IconStream = System.IO.File.OpenWrite(fileName);

 

        Bitmap bitmap = new Bitmap(pbImage.Image);

        bitmap.SetResolution(72, 72);

        Icon icon = System.Drawing.Icon.FromHandle(bitmap.GetHicon());

        this.Icon = icon;

        icon.Save(IconStream);

      }

    }

  }

}

 

출처: http://code.msdn.microsoft.com/windowsdesktop/Convert-Image-file-to-Icon-c927d9f7