extern POBJECT_TYPE IoDriverObjectType链接错误？

根据某位著名的驱动大师的说法：IoDriverObjectType是一个全局变量，只需要声明即可使用。但是声明后提示错误：

extern POBJECT_TYPE IoDriverObjectType;

1>driver2005.obj() : error LNK2001: unresolved external symbol "struct _OBJECT_TYPE  * IoDriverObjectType" (?IoDriverObjectType@@3PAPAU_OBJECT_TYPE@@A)

提示该变量无法链接。谁帮个忙那？

IoDriverObjectType 的 类型是 "POBJECT_TYPE*"  不是 "POBJECT_TYPE"

改为
extern POBJECT_TYPE* IoDriverObjectType;

i can follow you!sorry