做一个传统的键盘过滤，但是键盘输入总有一个在等待的irp，也就导致过滤键盘的按键总会漏掉第一个按键。
如何找到这个IRP并把它取消掉？望大大们指点！！！
我尝试在KbdClass->DeviceObject->DeviceExtension里面去获取，但是不知道是不是我的DeviceExtension结构定义跟我测试的系统（xpsp3）有出入（获取到ReadQueue不对）

DeviceExtension定义是我从ddk中的kbdclass.h拷贝的，是不是哪里错了
//
// Class device extension.
//
typedef struct _DEVICE_EXTENSION {

    //
    // Back pointer to the Device Object created for this port.
    //
    PDEVICE_OBJECT  Self;

    //
    // Pointer to the active Class DeviceObject;
    // If the AFOAOFA (all for one and one for all) switch is on then this
    // points to the device object named as the first keyboard.
    //
    PDEVICE_OBJECT  TrueClassDevice;

    //
    // The Target port device Object to which all IRPs are sent.
    //
    PDEVICE_OBJECT  TopPort;

    //
    // The PDO if applicable.
    //
    PDEVICE_OBJECT  PDO;

    //
    // A remove lock to keep track of outstanding I/Os to prevent the device
    // object from leaving before such time as all I/O has been completed.
    //
    IO_REMOVE_LOCK  RemoveLock;

    //
    // If this port a Plug and Play port
    //
    BOOLEAN         PnP;
    BOOLEAN         Started;
    BOOLEAN         AllowDisable;

    KSPIN_LOCK WaitWakeSpinLock;

    //
    // Is the Trusted Subsystem Connected
    //
    ULONG TrustedSubsystemCount;

    //
    // Number of input data items currently in the InputData queue.
    //
    ULONG InputCount;

    //
    // A Unicode string pointing to the symbolic link for the Device Interface
    // of this device object.
    //
    UNICODE_STRING  SymbolicLinkName;

    //
    // Start of the class input data queue (really a circular buffer).
    //
    PKEYBOARD_INPUT_DATA InputData;

    //
    // Insertion pointer for InputData.
    //
    PKEYBOARD_INPUT_DATA DataIn;

    //
    // Removal pointer for InputData.
    //
    PKEYBOARD_INPUT_DATA DataOut;

    //
    // Keyboard attributes.
    //
    KEYBOARD_ATTRIBUTES  KeyboardAttributes;

    //
    // A saved state of indicator lights
    //
    KEYBOARD_INDICATOR_PARAMETERS   IndicatorParameters;

    //
    // Spinlock used to synchronize access to the input data queue and its
    // insertion/removal pointers.
    //
    KSPIN_LOCK SpinLock;

    //
    // Queue of pended read requests sent to this port.  Access to this queue is
    // guarded by SpinLock
    //
    LIST_ENTRY ReadQueue;

    //
    // Request sequence number (used for error logging).
    //
    ULONG SequenceNumber;

    //
    // The "D" and "S" states of the current device
    //
    DEVICE_POWER_STATE DeviceState;
    SYSTEM_POWER_STATE SystemState;

    ULONG UnitId;

    //
    // WMI Information
    //
    WMILIB_CONTEXT WmiLibInfo;

    //
    // Mapping of system to device states when a wait wake irp is active
    //
    DEVICE_POWER_STATE SystemToDeviceState[PowerSystemHibernate];

    //
    // Minimum amount of power needed to wake the device
    //
    DEVICE_POWER_STATE MinDeviceWakeState;

    //
    // Lowest system state that the machine can be in and have the device wake it up
    //
    SYSTEM_POWER_STATE MinSystemWakeState;

    //
    // Actual wait wake irp
    //
    PIRP WaitWakeIrp;

    //
    // Duplicate wait wake irp getting completed because another was queued.
    //
    PIRP ExtraWaitWakeIrp;

    //
    // Target Device Notification Handle
    //
    PVOID TargetNotifyHandle;

    //
    // Only used for a legacy port device
    //
    LIST_ENTRY Link;

    //
    // Used only for a legacy port device when grand master mode is off
    //
    PFILE_OBJECT File;

    //
    // Used for a legacy port device
    //
    BOOLEAN Enabled;

    //
    // Indicates whether it is okay to log overflow errors.
    //
    BOOLEAN OkayToLogOverflow;

    //
    // Indicates whether it is okay to send wait wake irps down the stack
    // (does NOT reflect if the bus can implement or not)
    //
    BOOLEAN WaitWakeEnabled;

    //
    // Indicates whether we have received a surprise removed irp
    //
    BOOLEAN SurpriseRemoved;

} DEVICE_EXTENSION, *PDEVICE_EXTENSION;

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