用php代码实现验证码功能，非常简单，适合注册登录-Using php code to achieve functional verification code is very simple and suitable for registration login

MakeBar.dll二维条码生成动态连接库，用以生成PDF417二维条码，适用于windows环境开发工具。-This application not only demonstrates the basics of using the Microsoft Foundation classes but is also a starting point for writing your application.