6.622 covers modeling, analysis, design, control, and application of circuits for energy conversion and control. As described by the IEEE, power electronics technology "encompasses the use of electronic components, the application of circuit theory and design techniques, and the development of analytical tools toward efficient electronic conversion, control, and conditioning of electric power." Students taking this class will come away with an understanding of the fundamental principles of power electronics, and knowledge of how to both analyze and design power electronic components and systems.
我用下面的代码实现读取通话记录,程序执行下来没有错误,也能返回所有的通话条数,但是hr=PhoneGetCallLogEntry(h,&pCall);方法把每一条数据放在pCall中时,我通过监视发现pCall中的数据都是空的。但下面hr=PhoneSeekCallLog(h,CALLLOGSEEK_END,0,&re);方法却能返回总的记录个数。注:我是用 windows mobile 5.0