一个用VC开发的dll(遵循支付密码器系统通用性技术规范）,通过RS232读取银行密码支付器的支付密码。附API详细的调用说明，以及一个C#编写的调用DLL的例子。-With the development of a VC dll (follow the universal payment system password device specification), paid through the RS232 device to read the payment of bank passwor