生成微信二维码显示base64图片

qrcode_png = RQRCode::QRCode.new( wxpay_prepay["code_url"], :size => 5, :level => :h ).as_png.resize(200, 200)
@pay_order = Base64.encode64(qrcode_png.to_s)
 
render "activities/payment", layout: "activities"
 
<img src="data:image/png;base64,<%=@pay_order%>"  class="weixin_zhifu"/>