前言
很多微信公眾號中需要生成推廣海報的功能，粉絲獲得專屬海報后可以分享到朋友圈或發(fā)給朋友，為公眾號代言邀請好友即可獲取獎勵的。海報自帶渠道二維碼，粉絲長按二維碼即可關注微信公眾號，從而達到吸粉的目的。
效果如下：
代碼實現(xiàn)：
1.獲取臨時二維碼ticket
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/// <summary>/// 獲取臨時二維碼ticket/// </summary>/// <param name="scene_str">場景值id openid做場景值id</param>/// <returns></returns>public static string createtempqrcode(string scene_str,string access_token){ var result = httputility.sendposthttprequest($"https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token={access_token}", "application/json", "{\"expire_seconds\": 2592000, \"action_name\": \"qr_str_scene\", \"action_info\": {\"scene\": {\"scene_str\": \"" + scene_str + "\"}}}"); jobject jobect = (jobject)jsonconvert.deserializeobject(result); string ticket = (string)jobect["ticket"]; if (string.isnullorempty(ticket)) { loghelper.writelog(typeof(weixinhelper), "獲取臨時二維碼ticket失敗" + result); return null; } return ticket;} |
使用openid作為場景值的好處是通過掃a推廣的二維碼關注用戶的場景值便是a的openid。
2. 生成帶二維碼的專屬推廣圖片
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/// <summary>/// 生成帶二維碼的專屬推廣圖片/// </summary>/// <param name="user"></param>/// <returns></returns>public string draw(wxuser user){ //背景圖片 string path = server.mappath("/content/images/tg.jpg"); system.drawing.image imgsrc = system.drawing.image.fromfile(path); //處理二維碼圖片大小 240*240px system.drawing.image qrcodeimage = reduceimage("https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket="+user.ticket, 240, 240); //處理頭像圖片大小 100*100px image titleimage = reduceimage(user.headimgurl, 100, 100); using (graphics g = graphics.fromimage(imgsrc)) { //畫專屬推廣二維碼 g.drawimage(qrcodeimage, new rectangle(imgsrc.width - qrcodeimage.width - 200, imgsrc.height - qrcodeimage.height - 200, qrcodeimage.width, qrcodeimage.height), 0, 0, qrcodeimage.width, qrcodeimage.height, graphicsunit.pixel); //畫頭像 g.drawimage(titleimage, 8, 8, titleimage.width, titleimage.height); font font = new font("宋體", 30, fontstyle.bold); g.drawstring(user.nickname, font, new solidbrush(color.red), 110, 10); } string newpath = server.mappath(@"/content/images/newtg_" + guid.newguid().tostring() + ".jpg"); imgsrc.save(newpath, system.drawing.imaging.imageformat.jpeg); return newpath;}/// <summary>/// 縮小/放大圖片/// </summary>/// <param name="url">圖片網絡地址</param>/// <param name="towidth">縮小/放大寬度</param>/// <param name="toheight">縮小/放大高度</param>/// <returns></returns>public image reduceimage(string url, int towidth, int toheight){ webrequest request = webrequest.create(url); webresponse response = request.getresponse(); stream responsestream = response.getresponsestream(); image originalimage = image.fromstream(responsestream); if (towidth <= 0 && toheight <= 0) { return originalimage; } else if (towidth > 0 && toheight > 0) { if (originalimage.width < towidth && originalimage.height < toheight) return originalimage; } else if (towidth <= 0 && toheight > 0) { if (originalimage.height < toheight) return originalimage; towidth = originalimage.width * toheight / originalimage.height; } else if (toheight <= 0 && towidth > 0) { if (originalimage.width < towidth) return originalimage; toheight = originalimage.height * towidth / originalimage.width; } image tobitmap = new bitmap(towidth, toheight); using (graphics g = graphics.fromimage(tobitmap)) { g.interpolationmode = system.drawing.drawing2d.interpolationmode.high; g.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality; g.clear(color.transparent); g.drawimage(originalimage, new rectangle(0, 0, towidth, toheight), new rectangle(0, 0, originalimage.width, originalimage.height), graphicsunit.pixel); originalimage.dispose(); return tobitmap; }} |
3.將圖片上傳微信服務器，并發(fā)送給用戶
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string imagepath = draw(user); string result = httputility.uploadfile($"https://api.weixin.qq.com/cgi-bin/material/add_material?access_token={access_token}&type=image", imagepath);jobject jobject = (jobject)jsonconvert.deserializeobject(result); string media_id = (string)jobject["media_id"];if (!string.isnullorempty(media_id)){ string resxml = "<xml><tousername><![cdata[" + xmlmsg.fromusername + "]]></tousername><fromusername><![cdata[" + xmlmsg.tousername + "]]></fromusername><createtime>" + nowtime + "</createtime><msgtype><![cdata[image]]></msgtype><image><mediaid><![cdata[" + media_id + "]]></mediaid></image></xml>"; return resxml;}loghelper.writelog(typeof(wechatcontroller), "上傳專屬推廣圖片素材失敗" + result); |
總結
以上就是這篇文章的全部內容了，希望本文的內容對大家的學習或者工作具有一定的參考學習價值，如果有疑問大家可以留言交流，謝謝大家對服務器之家的支持。
原文鏈接：https://www.cnblogs.com/gracexu/p/10081111.html
