COM是一种跨应用和语言共享二进制代码的方法。与C++不同，它提倡源代码重用。ATL便是一个很好的例证。源码级重用虽然好，但只能用于C++。-COM is a language shared across applications and binary code. And C++, which advocates the source code reuse. ATL is a good example. Source-level reuse is good, but only for C++.