Q:实现IContextMenu出现C2787错误：“IContextMenu”：没有与该对象关联的GUID

From: http://community.youkuaiyun.com/expert/Topicview2.asp?id=4853965

A:There are two header files in VC.NET, one in Vc7/include and the other in Vc7/PlatformSDK/include. The former splits off the smart pointer typedefs into comdefsp.h, and it doesn't include IContextMenu. The latter does. You can try to #include the PlatformSDK header directly, change your INCLUDE path order, or supply the missing typedef yourself, e.g.

struct __declspec(uuid("000214e4-0000-0000-c000-000000000046"))
IContextMenu;

_COM_SMARTPTR_TYPEDEF(IContextMenu, __uuidof(IContextMenu));