erp/SiteCore/Handler/GetBar.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Web;
using System.Web.Script.Serialization;
using Utils;

namespace SiteCore.Handler
{
    class GetBar : BaseHandler, IHttpHandler
    {
        string appid = "wx968c99ff1498e09f";
        string appsecret = "153afb0877ee60fecd7f5580c9182ee6";
        public void ProcessRequest(HttpContext context)
        {
            con = context;
            CommonHelper.PageExpires();
            HttpHelper http = new HttpHelper();
            HttpResult hResult = null;
            string sid = GetString("sid");
            string tid = GetString("tid");
            string file = webConfig.WeiXinPicPath + "\\" + sid + "_" + tid + ".bmp";
            object bf = WebCache.GetCache("wx_" + sid + "_" + tid);
            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(sid + "_" + dtime);
                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/index?sid=" + sid + (tid == "" ? "" : "&tid=" + tid) + "\"}",
                    //Postdata = "scene=bbbb&page=pages/home/home",
                    ResultType = ResultType.Byte,
                    Accept = "image/webp,image/*,*/*;q=0.8",
                    ContentType = "application/json"
                };
                if (tid != "") item.Postdata = "{\"width\":500,\"line_color\":{\"r\":\"17\",\"g\":\"123\",\"b\":\"185\"},\"path\":\"pages/login/login?sid=" + sid + "&tid=" + tid + "\"}";
                else item.Postdata = "{\"width\":500,\"line_color\":{\"r\":\"17\",\"g\":\"123\",\"b\":\"185\"},\"path\":\"pages/index?sid=" + sid + "\"}";
                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(webConfig.WeiXinPicPath + "\\" + sid + ".bmp", ImageFormat.Bmp);
                    WebCache.AddCacheWithTime("wx_" + sid, 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();
            }
        }

        //private void writeCode(string txt)
        //{
        //    if (txt != "")
        //    {
        //        string[] tArr = txt.Split('|');
        //        string rnd = CommonHelper.GetRnd(10, true, true, true, false, "");
        //        string str = SecurityHelper.UrlEncoding(tArr[1] + "_" + rnd);
        //        txt = tArr[0] + "|" + str;
        //        Bitmap bmp = GetQRCodeByZXingNet(txt, 500, 400);

        //        //  将生成的图片发回客户端
        //        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();

        //        //Response.Write(txt);
        //        //Response.Write("<script type=\"text/javascript\">window.location.href='http://qr.topscan.com/api.php?w=400&text=" + txt + "';</script>");
        //    }

        //}

        /// <summary>
        /// 生成二维码图片
        /// </summary>
        /// <param name="strMessage">要生成二维码的字符串</param>
        /// <param name="width">二维码图片宽度</param>
        /// <param name="height">二维码图片高度</param>
        /// <returns></returns>
        //private Bitmap GetQRCodeByZXingNet(String strMessage, Int32 width, Int32 height)
        //{
        //Bitmap result = null;
        //try
        //{
        //    BarcodeWriter barCodeWriter = new BarcodeWriter();
        //    barCodeWriter.Format = BarcodeFormat.QR_CODE;
        //    barCodeWriter.Options.Hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
        //    barCodeWriter.Options.Hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H);
        //    barCodeWriter.Options.Height = height;
        //    barCodeWriter.Options.Width = width;
        //    barCodeWriter.Options.Margin = 0;
        //    ZXing.Common.BitMatrix bm = barCodeWriter.Encode(strMessage);
        //    result = barCodeWriter.Write(bm);
        //}
        //catch (Exception ex)
        //{
        //    //异常输出
        //}
        //return result;
        //}
    }
}