erp/SiteCore/Handler/GetBarcode.cs

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Script.Serialization;
using Utils;

namespace SiteCore.Handler
{
    public class GetBarcode : BaseHandler, IHttpHandler
    {
        string appid = "wx0819ba57901308c0";
        string appsecret = "d9b31c6be01fc55f082a770a4462ef5c";
        public void ProcessRequest(HttpContext context)
        {
            con = context;
            CommonHelper.PageExpires();
            HttpHelper http = new HttpHelper();
            HttpResult hResult = null;
            int bid = GetInt("bid");
            int ismet = GetInt("ismet");
            string name = GetString("name");
            //string file = WeiXinPicPath + "\\" + bid + ".bmp";
            //object bf = WebCache.GetCache("wx_" + bid);
            //if (bf != null && File.Exists(bf.ToString()))//如果己存在5分钟内的二维码
            //{
            //    Bitmap bmp = new Bitmap(file);
            //    MemoryStream ms = new MemoryStream();
            //    bmp.Save(ms, ImageFormat.Bmp);
            //    con.Response.ClearContent(); //需要输出图象信息 要修改HTTP头 
            //    con.Response.ContentType = "image/bmp";
            //    con.Response.BinaryWrite(ms.ToArray());
            //    if (ms != null) ms.Dispose();
            //    con.Response.End();
            //    return;
            //}
            object cat = WebCache.GetCache("at");
            if (cat == null)
            {
                HttpItem item = new HttpItem()
                {
                    URL = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appid + "&secret=" + appsecret
                };
                hResult = http.GetHtml(item);
                string html = hResult.Html;
                JavaScriptSerializer jss = new JavaScriptSerializer();
                Dictionary<string, object> jObj = jss.Deserialize<Dictionary<string, object>>(html);
                if (!jObj.ContainsKey("errcode"))
                {
                    string at = jObj["access_token"].ToString();
                    WebCache.AddCacheWithTime("at", at, 1.8);
                    cat = at;
                }
            }
            if (cat != null)
            {
                string dtime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
                string parms = SecurityHelper.UrlEncoding(bid + "_" + dtime + "_" + ismet);
                parms = parms.Replace("=", "@");
                HttpItem item = new HttpItem()
                {
                    URL = "https://api.weixin.qq.com/wxa/getwxacode?access_token=" + cat,
                    Method = "POST",
                    Postdata = "{\"width\":500,\"line_color\":{\"r\":\"17\",\"g\":\"123\",\"b\":\"185\"},\"path\":\"pages/sign/sign?p=" + parms + "|" + dtime + "\"}",
                    //Postdata = "scene=bbbb&page=pages/home/home",
                    ResultType = ResultType.Byte,
                    Accept = "image/webp,image/*,*/*;q=0.8",
                    ContentType = "application/json"
                };
                hResult = http.GetHtml(item);
                if (hResult.Html.IndexOf("errcode") != -1)
                {
                    return;
                }
                //using (MemoryStream ms = new MemoryStream(hResult.ResultByte))
                //{
                //    Bitmap bm = new Bitmap(ms);
                //    bm.Save(WeiXinPicPath + "\\" + bid + ".bmp", ImageFormat.Bmp);
                //    WebCache.AddCacheWithTime("wx_" + bid, file, 3);//3个小时变一次
                //}
                con.Response.ClearContent(); //需要输出图象信息 要修改HTTP头 
                con.Response.ContentType = "image/bmp";
                con.Response.BinaryWrite(hResult.ResultByte);
                con.Response.End();
            }
        }

    }
}