Delphi限定程序的使用时限，程序逻辑：先判断是否初次运行程序，不是第一次运行，则判断当前的系统时间是否超出了使用期限，这里假定软件试用期限30天，此值可自定义，本源码仅演示这类程序的逻辑实现过程，有助于编写软件注册程序。-Delphi limited time, program logic: first determine whether the first running program, not the first operation, judging whether the current system time exceeded the period of use, the assumption here software trial period of 30 days, this value can be defined, the source code is only to demonstrate this kind of program logic implementation process, help programmers software registration.