理解驱动对象（DrvierObject）
每个驱动程序都会有唯一一个驱动对象表示，驱动对象是对驱动程序的实例化。她由Ring0层的执行体组件中的IO管理器负责加载，并且每个驱动只加载一个实例。在wdm.h头文件中。DriverObject结构如下：typedef struct _DRIVER_OBJECT { CSHORT Type; CSHORT Size; // // The following links all of the devices created by a single driver // together on a list, and the Flags word provides an extensible flag // location for driver objects. // PDEVICE_OBJECT DeviceObject; ULONG Flags; // // The following section describes where the driver is loaded.The count // field is used to count the number of times the driver has had its // registered reinitialization routine invoked. // PVOID DriverStart; ULONG DriverSize; PVOID DriverSection; PDRIVER_EXTENSION DriverExtension; // // The driver name field is used by the error log thread // determine the name of the driver that an I/O request is/was bound. // UNICODE_STRING DriverName; // // The following section is for registry support.Thise is a pointer // to the path to the hardware information in the registry // PUNICODE_STRING HardwareDatabase; // // The following section contains the optional pointer to an array of // alternate entry points to a driver for "fast I/O" support.Fast I/O // is performed by invoking the driver routine directly with separate // parameters, rather than using the standard IRP call mechanism.Note // that these functions may only be used for synchronous I/O, and when // the file is cached. // PFAST_IO_DISPATCH FastIoDispatch; // // The following section describes the entry points to this particular // driver.Note that the major function dispatch table must be the last // field in the object so that it remains extensible. // PDRIVER_INITIALIZE DriverInit; PDRIVER_STARTIO DriverStartIo; PDRIVER_UNLOAD DriverUnload; PDRIVER_DISPATCH MajorFunction;} DRIVER_OBJECT;DeviceObject：每个驱动会有一个或者多个设备对象。这些设备对象通过链表的方式组织。每个设备对象有一个 nextDevice的指针指向链表的下一个设备对象。但是注意：驱动对象里面的这个DeviceObject相当于 设备链表的头节点。他指向的是：本驱动程序自己创建的第一个设备对象。DriverName:驱动的名字DriverStartIO：处理多个irp的时候。需要这个来序列化。DriverUnload：卸载驱动的时候的回调函数。Driverextension：驱动的扩展。和设备的扩展差不多。majorFunction:IRP派遣函数。这个感觉也相当于回调。只不过是向操作系统注册IRP的处理函数。Flag：标志位。
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