如何在驱动程序一中打开其他的驱动程序二，并获取其驱动程序二的DriverObject

1、如何在驱动程序一中打开其他的驱动程序二，并获取其驱动程序二的DriverObject。
2、向一个驱动程序发出电源关闭的信号。

问题一：如果你知道驱动程序二的文件名就可以获得它的DriverObject。方法如下：

extern POBJECT_TYPE *IoDriverObjectType;

/*---------------------------------------------------------
*
* FUNCTION ObReferenceObjectByName
*
* DESCRIPTION ObReferenceObjectByName() is an undocument kernel
*               API. It is used to get the driver object from
*               the driver name. We have to define the prototype
*               here in order to use this function
*
* INPUTS ObjectName --> Pointer to a counted unicode string
*                              that holds the name of the object
*               Attributes --> We set this para as OBJ_CASE_INSENSITIVE
*               PassedAccessState --> OPTIONAL, we set it as NULL
*               DesiredAccess --> OPTIONAL, we set it as 0
*               ObjectType --> Driver object type
*               AccessMode --> We set this para to KernelMode
*               ParseContext --> A pointer that is passed uninterpreted
*                                to any parse procedure that is called
*                                during the course of performing the name lookup
*               Object --> Address of the variable that receives a
*                          pointer to the object if the object is found
*
* RETURNS STATUS_SUCCESS if successful, else the appropriate
* error code
*
*--------------------------------------------------------*/
extern
NTKERNELAPI
NTSTATUS
ObReferenceObjectByName (
    IN PUNICODE_STRING  ObjectName,
    IN ULONG            Attributes,
    IN PACCESS_STATE    PassedAccessState OPTIONAL,
    IN ACCESS_MASK      DesiredAccess OPTIONAL,
    IN POBJECT_TYPE     ObjectType,
    IN KPROCESSOR_MODE  AccessMode,
    IN OUT PVOID        ParseContext OPTIONAL,
    OUT PVOID           *Object
);

对于问题二，是不是发送相应的IRP_MJ_POWER，PoSetPowerState()就可以了。具体不是很清楚，没做过。查看DDK的文档吧。