请问各位达人另一个 有关 键盘 的filter的问题（修改 Ctrl2cap）？

先在DriverEntry中添加

DriverObject->MajorFunction [IRP_MJ_CREATE] =
    DriverObject->MajorFunction [IRP_MJ_CLOSE]  = MKFDDispatchCreateClose;


然后我在Ctrl2cap的AddDevice中用下面代码创建两个设备(我是菜鸟，错了请改正哦)
NTSTATUS
MKFDAddDevice(
    IN PDRIVER_OBJECT   Driver,
    IN PDEVICE_OBJECT   PDO
    )
{
    PDEVICE_EXTENSION        devExt;
    IO_ERROR_LOG_PACKET      errorLogEntry;
    PDEVICE_OBJECT           device;
PDEVICE_OBJECT           deviceTHIS;
    NTSTATUS                 status = STATUS_SUCCESS;

static WCHAR i=0;

UNICODE_STRING devname,linkname;

RtlInitUnicodeString(&devname, L"DeviceMKFD ");
RtlInitUnicodeString(&linkname, L"DosDevicesSysKeyfilter ");
devname.Buffer[(devname.Length/sizeof(WCHAR))-1]=L'0'+i;
linkname.Buffer[(linkname.Length/sizeof(WCHAR))-1]=L'0'+i;
i++;

    //
    // Create a filter device and attach it to the device stack.
    //
    status = IoCreateDevice(Driver,
sizeof(DEVICE_EXTENSION),&devname,FILE_DEVICE_KEYBOARD,
0,FALSE,&device);
    if (!NT_SUCCESS(status))
{
        return (status);
    }

    RtlZeroMemory(device->DeviceExtension, sizeof(DEVICE_EXTENSION));

    devExt = (PDEVICE_EXTENSION) device->DeviceExtension;

status=IoCreateSymbolicLink(&linkname,&devname);
if (!NT_SUCCESS(status))
{
        return (status);
    }

IoInitializeRemoveLock(&devExt->RemoveLock, 0, 0, 0);

    devExt->TopOfStack = IoAttachDeviceToDeviceStack(device, PDO);

    ASSERT(devExt->TopOfStack);

devExt->flags=MKFDFD;
    device->Flags |= (DO_BUFFERED_IO | DO_POWER_PAGABLE);
    device->Flags &= ~DO_DEVICE_INITIALIZING;

//
    // Create a device FOR create/read/deviceiocontrol
    //
    status = IoCreateDevice(Driver,
sizeof(DEVICE_EXTENSION),NULL,FILE_DEVICE_KEYBOARD,
0,FALSE,&deviceTHIS);
    if (!NT_SUCCESS(status))
{
        return (status);
    }

    RtlZeroMemory(deviceTHIS->DeviceExtension, sizeof(DEVICE_EXTENSION));

((PDEVICE_EXTENSION)deviceTHIS->DeviceExtension)->flags=MKFDTD;
    deviceTHIS->Flags |= (DO_BUFFERED_IO | DO_POWER_PAGABLE);
    deviceTHIS->Flags &= ~DO_DEVICE_INITIALIZING;


    return status;
}

然后用下面的代码处理不同的设备的create/close
NTSTATUS MKFDDispatchCreateClose(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp )
{
    PIO_STACK_LOCATION  irpStack;
    PDEVICE_EXTENSION   devExt;

    irpStack = IoGetCurrentIrpStackLocation(Irp);
    devExt = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;

    switch (irpStack->MajorFunction)
{
       case IRP_MJ_CREATE:
  if (devExt->flags & MKFDTD)
  {
  return STATUS_SUCCESS;
  }
  break;
  case IRP_MJ_CLOSE:
  if (devExt->flags & MKFDTD)
  {
  return STATUS_SUCCESS;
  }
  break;
    }

    //
    // Pass on the create and the close
    //
    return MKFDDispatchGeneral(DeviceObject, Irp);
}

请问各位，为何我CreateFile时总是只能写不能读呢？
其它的都没有修改，而且符号连接也已经建立成功了。

[编辑 -  6/18/04 by  Deauty]

头文件
//
// MKFD.h
//



#define KEY_UP         1
#define KEY_DOWN       0

#define LCONTROL       ((USHORT)0x1D)
#define CAPS_LOCK      ((USHORT)0x3A)


//
// Print macro that only turns on when checked builds are on
//
#if DBG
#define DbgPrint(arg) DbgPrint arg
#else
#define DbgPrint(arg)
#endif

//
// Undocumented NT 4 function to print to the startup screen
//
NTSYSAPI
NTSTATUS
NTAPI
ZwDisplayString( PUNICODE_STRING String );


//
// Our device extension definition
//
typedef struct _DEVICE_EXTENSION
{
    //
    // The top of the stack before this filter was added.  AKA the location
    // to which all IRPS should be directed.
    //
ULONG           flags;
    PDEVICE_OBJECT  TopOfStack;
UNICODE_STRING  ifSymLinkName;
IO_REMOVE_LOCK  RemoveLock;

} DEVICE_EXTENSION, *PDEVICE_EXTENSION;

#define MKFDTD 0x00000001
#define MKFDFD 0x00000000

//
// Forwards
//
NTSTATUS DriverEntry(
    IN PDRIVER_OBJECT  DriverObject,
    IN PUNICODE_STRING RegistryPath
    );
NTSTATUS
MKFDAddDevice(
    IN PDRIVER_OBJECT   Driver,
    IN PDEVICE_OBJECT   PDO
    );
NTSTATUS MKFDPnP(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP           Irp
    );
NTSTATUS MKFDPower(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP           Irp
    );
VOID
MKFDUnload(
   IN PDRIVER_OBJECT Driver
   );
NTSTATUS MKFDInit(
    IN PDRIVER_OBJECT DriverObject
    );
NTSTATUS MKFDDispatchRead(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp
    );
NTSTATUS MKFDDispatchCreateClose(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp
    );
NTSTATUS MKFDDeviceControl(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp
    );
NTSTATUS MKFDDispatchGeneral(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP           Irp
    );

这个问题不知道你现在解决没有，如果没有可以留个联系方法讨论一下。。。。。