这篇文章主要介绍了C#如何生成带二维码的专属微信公众号推广海报,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
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效果如下:
代码实现:
1.获取临时二维码ticket
////// 获取临时二维码ticket /// /// 场景值ID openid做场景值ID ///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), "获取临时二维码ticket失败" + result); return null; } return ticket; }
使用openid作为场景值的好处是通过扫A推广的二维码关注用户的场景值便是A的openid。
2. 生成带二维码的专属推广图片
////// 生成带二维码的专属推广图片 /// /// ///public string Draw(WxUser user) { //背景图片 string path = Server.MapPath("/Content/images/tg.jpg"); System.Drawing.Image imgSrc = System.Drawing.Image.FromFile(path); //处理二维码图片大小 240*240px System.Drawing.Image qrCodeImage = ReduceImage("https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket="+user.ticket, 240, 240); //处理头像图片大小 100*100px Image titleImage = ReduceImage(user.headimgurl, 100, 100); using (Graphics g = Graphics.FromImage(imgSrc)) { //画专属推广二维码 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); //画头像 g.DrawImage(titleImage, 8, 8, titleImage.Width, titleImage.Height); Font font = new Font("宋体", 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; } /// /// 缩小/放大图片 /// /// 图片网络地址 /// 缩小/放大宽度 /// 缩小/放大高度 ///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.将图片上传微信服务器,并发送给用户
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 = ""; return resxml; } LogHelper.WriteLog(typeof(WechatController), "上传专属推广图片素材失败" + result); " + nowtime + "
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