CINTERFACE 宏的作用

//////////////////////////////////////////////////////////////////////////////
//
//  WARNING:
//
//  CINTERFACE must be defined so that the lpVtbl pointer is visible
//  on COM interfaces.  However, once we've defined it, we must use
//  coding conventions when accessing interface members, for example:
//      i->lpVtbl->Write
//  instead of the C++ syntax:
//      i->Write.
//  We must also pass the implicit "this" parameter explicitly:
//      i->lpVtbl->Write(i, pb, 0, NULL)
//  instead of the C++ syntax:
//      i->Write(pb, 0, NULL)
//
#define CINTERFACE

CINTERFACE宏用于在c++项目中使用c风格（规范）的COM 接口调用。