const QR = require("../../utils/qrcode.js");

createQrCode: function (url, canvasId, cavW, cavH) {

    //调用插件中的draw方法，绘制二维码图片

    QR.api.draw(url, canvasId, cavW, cavH);

    setTimeout(() => { this.canvasToTempImage(); }, );

  },

  //获取临时缓存照片路径，存入data中

  canvasToTempImage: function () {

    var that = this;

    wx.canvasToTempFilePath({

      canvasId: 'mycanvas',

      success: function (res) {

        var tempFilePath = res.tempFilePath;

        console.log(tempFilePath);

        that.setData({

          imagePath: tempFilePath,

          // canvasHidden:true

        });

      },

      fail: function (res) {

        console.log(res);

      }

    });

  },

  //点击图片进行预览，长按保存分享图片

  previewImg: function (e) {

    var img = this.data.imagePath;

    console.log(img);

    wx.previewImage({

      current: img, // 当前显示图片的http链接

      urls: [img] // 需要预览的图片http链接列表

    })

  },

        private void GenerateQRCode(string CustomOrderNumber, string code)

        {

            //You only need five lines of code, to generate and view your first QR code.

            QRCodeGenerator qrGenerator = new QRCodeGenerator();

            QRCodeData qrCodeData = qrGenerator.CreateQrCode(code, QRCodeGenerator.ECCLevel.Q);

            QRCode qrCode = new QRCode(qrCodeData);

            Bitmap qrCodeImage = qrCode.GetGraphic();

            var filepath = _host.WebRootPath + "\\images\\qrcode\\" + CustomOrderNumber + "_" + code + ".jpg";

            FileStream fs = new FileStream(filepath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);

            qrCodeImage.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);

            fs.Close();

            qrCodeImage.Dispose();

        }