扩展COleDropTarget类来支持任意窗口拖放-sustain windows drag though COleDropTarget cla

本程序在VC6.0平台实现。是函数模板的扩展，也是学习com+的实现基础。-the procedures in VC6.0 platform. Template function of the expansion, as well as the realization of learning com basis.

自己的复数类，简单好用，而且清晰易懂，并且在此基础上进一步改动，扩展功能，相比原来自带的复数类而言，没有冗余的部分功能。-Their plural class, easy to use, and lucid, and on this basis, further changes, extensions, compared to the original complex number class comes, there is no redundancy in some functions.