图片流Base64编码 转图片

using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.IO;

using System.Web;

 

namespace OnlinePhotoCapture

{

    /// <summary>

    /// 将图片base64字符串原还原为图片并调整尺寸后保存(by 菩提树下的杨过http://yjmyzz.cnblogs.com/)  

    /// </summary>   

    public class SavePhoto : IHttpHandler

    {

 

        public void ProcessRequest(HttpContext context)

        {

            context.Response.ContentType = "text/plain";

 

            string base64String = "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";

 

            Image bmp = null;

            MemoryStream ms = null;

            try

            {

                byte[] b = Convert.FromBase64String(base64String);

                ms = new MemoryStream(b);

                bmp = ImageResize(new Bitmap(ms),125,125);

                bmp.Save(context.Request.MapPath("logo.jpg"), ImageFormat.Jpeg);

                context.Response.Write("success");

            }

            catch (Exception ex)

            {

                context.Response.Write("failure:" + ex.Message.ToString());

            }

            finally

            {

                bmp.Dispose();

                ms.Dispose();

            }

 

        }

 

        

 

        /// <summary>

        /// 修改图片尺寸

        /// </summary>

        /// <param name="imgSrc"></param>

        /// <returns></returns>

        private Image ImageResize(Image imgSrc,int width,int height)

        {

            Image newImage = imgSrc.GetThumbnailImage(125, 125, null, new IntPtr());

            Graphics g = Graphics.FromImage(newImage);

            g.DrawImage(newImage, 0, 0, newImage.Width, newImage.Height);

            g.Dispose();

            return newImage;

        }

 

 

        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

 

    }

}