微信小程序生成二维码

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(); }