ashx读图片

来源：互联网发布：centos glibc 版本编辑：程序博客网时间：2024/04/30 00:15
using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
namespace ShowImage
{
    ///
    /// GetImg 的摘要说明。
    ///
    public class GetImage : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            string id = (string)context.Request["id"];
            if (id != null)
            {
                MemoryStream stream = new MemoryStream();
                SqlConnection conn = new SqlConnection(@"Server=;database=;uid=;Pwd=");
                Bitmap bm = null;
                Image image = null;
                try
                {
                    conn.Open();
                    SqlCommand cmd = new SqlCommand("select photo from employees where employeeid='" + id + "'", conn);
                    byte[] blob = (byte[])cmd.ExecuteScalar();
                    stream.Write(blob, 78, blob.Length - 78);
                    bm = new Bitmap(stream);
                    int width = 48;
                    int height = (int)(width * ((double)bm.Height / (double)bm.Width));
                    // GetThumbnailImage生成缩略图
                    image = bm.GetThumbnailImage(width, height, null, IntPtr.Zero);
                    context.Response.ContentType = "image/jpeg";
                    image.Save(context.Response.OutputStream, ImageFormat.Jpeg);
                }
                finally
                {
                    if (image != null)
                        image.Dispose();
                    if (bm != null)
                        bm.Dispose();
                    stream.Close();
                    conn.Close();
                }
            }
        }
        public bool IsReusable
        {
            get
            {
                return true;
            }
        }
    }
}