C++Builder中高精度定时器管理类设计及其应用①.PDF

2013 年 第 22 卷 第 8 期 计 算 机 系 统 应 用 ① C++ Builder 中高精度定时器管理类设计及其应用 李晓京, 张利利, 胡文东, 文治洪, 马 进 (第四军医大学 航空航天医学教育部重点实验室, 西安 710032) 摘 要: 介绍一种在 BCB 开发环境基于多线程的高精度定时器类的设计实现. 由VCL 组件库中的 TThread 派生 类结合 Windows 消息机制设计了实测误差0.5ms 的定时器类, 该类具有单实例-多定时器管理、线程工作状态可 控、回调方式可控等优点, 宜用性及可定制性均优于普遍采用的系统定时器及多媒体定时器, 可在工业控制、多 媒体应用设计、实时信号采集与处理等领域得到应用. 关键词: C++ Builder IDE; Windows; 定时器; 多线程; 线程优先级; Windows 消息机制; 定时精度; 实时性 Design and Application of High Resolution Timer Managing Class in C++Builder IDE LI Xiao-Jing, ZHANG Li-Li, HU Wen-Dong, WEN Zhi-Hong, MA Jin (Key Laboratory of Aerospace Medicine of Ministry of Education, Fourth Military Medical University, Xi’an 710032, China) Abstract: This paper present a realization of hi-resolution timer class, based on multithread technique, in the BCB IDE. Utilizing of the class, derived from TThread class of VCL and integrated with Windows message mechanism, achieved a general timing-error 0.5ms. The class is provided of advantages such as multiple timers - single object managing, work state of timer-thread adjusting, callback mode controlling, as well as more convenient and more customizable than traditional windows System Timer and Multimedia Timer. Thus it could be applied in projects with relatively time-critical requirement, e.g. industrial control, multimedia app development and realtime signal sampling processing. Key words: C++ Builder IDE; Windows; timer; multithread; thread priority; message mechanism; timing precision; real-time 相当多的应用对系统实时性有较高的要求, 需要 Windows 消息机制完成复杂任务处理, 也没有提供对 软件定时/计时达到 ms 甚至更高的精度. 但 Windows 定时器线程工况进行调整的接口, 使用起来并不方便; 系统的多任务分时特性决定了单纯依靠软件来得到高 API 查询方式则是