客户端和服务器之间的数据交换格式

Question

我正在用Python编写一个利用客户机/服务器通信的银行程序。据我所知，数据是通过原始字节的套接字传输的。你知道吗

这意味着客户机和服务器应该相互理解彼此之间传递的数据，以便能够对其进行适当的解码？世界各地的自动取款机如何在银行服务器之间来回传输数据？你知道吗

Answer 1

根据the wikipedia page

Common application layer transaction protocols, such as Diebold 91x (911 or 912) and NCR NDC or NDC+ provide emulation of older generations of hardware on newer platforms with incremental extensions made over time to address new capabilities, although companies like NCR continuously improve these protocols issuing newer versions (e.g. NCR's AANDC v3.x.y, where x.y are subversions). Most major ATM manufacturers provide software packages that implement these protocols. Newer protocols such as IFX have yet to find wide acceptance by transaction processors.[62]