驱动对象（DRIVER_OBJECT）

驱动对象（DRIVER_OBJECT）
每个驱动程序会有唯一一个驱动对象与之对应，并且该驱动对象是在驱动加载时被内核中的对象管理程序
创建的。

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.

    //一个指向设备对象的指针

    //设备对象可能为一个或者多个，所以指向设备对象的第一个指针，也是指向这个设别链的指针

    //

    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.

    //记录程序的名字，用UNICODE字符串记录

    //一般形式Driver[驱动程序名称]

    //

    UNICODE_STRING DriverName;

    //

    // The following section is for registry support.  Thise is a pointer

    // to the path to the hardware information in the registry

    //记录设备的硬件数据库键名 也是用UNICODE字符串记录
    //一般形式：REGISTRYMACHINEHARDWAREDESCRIPTIONSYSTEM
    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.

    //文件驱动的派遣函数，指向这个驱动程序的FastIO入口点定义的一个结构。这个成员只能通过FSDs和网络传输驱动来使用
    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.
    //指向DriverEntry函数的，这是通过IO管理器来建立的
    PDRIVER_INITIALIZE DriverInit;
        //记录StartIO例程的函数地址用于串行化操作，如果一个驱动程序没有StartIo函数，这个成员将是NULL
    PDRIVER_STARTIO DriverStartIo;
    //制定驱动卸载时所用的回调函数地址
    PDRIVER_UNLOAD DriverUnload;
        //指向驱动程序的DispatchXXX函数指针的数组。每个驱动程序至少要设置一个DispatchXXX函数指
        //针在这个数组里来处理这个驱动程序IRP请求包。任何一个驱动程序可以设置和IRP_MJ_XXX代码一
        //样多的DispatchXXX来处理IRP请求包.每个DispatchXXX结构如下：
　　//NTSTATUS DispatchXXX(IN PDEVICE_OBJECT DeviceObjec, IN PIRP Irp);
    PDRIVER_DISPATCH MajorFunction[IRP_MJ_MAXIMUM_FUNCTION + 1];

} DRIVER_OBJECT;

typedef struct _DRIVER_OBJECT *PDRIVER_OBJECT; 

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