为什么在我包含的头文件里有这个结构，而不让我用，请赐教！

请问我include了ntddk.h为什么还会出现：
error C2275:'OBJECT_HANDLE_INFORMATION' : illegal use of this type as an expression
1>e:\winddk\2600\inc\ddk\wxp\ntddk.h(21240) : error see declaration of 'OBJECT_HANDLE_INFORMATION'

error C2275: 'HANDLE' : illegal use of this type as an expression
1>e:\winddk\2600\inc\wxp\ntdef.h(443) : error see declaration of 'HANDLE'