关于设备扩展得问题

我些了个WDM的框架程序,在ADDDEVICE例程里初始化设备扩展变量ULONG A=10;然后在删除设备例程里,写了很简单的一些代码:设备接口无效,清除GUID缓冲区,从设备堆栈删除该设备,删除设备对象,应该室很常规的操作.
我的问题是当程序运行完删除设备例程后,发生蓝屏,错误代码0x0a,是说在大于或者等于DISPATCH_LEVEL的级别上使用了分页内存,引起错误的文件是内核文件:ntoskrnl.exe.
当我在ADDDEVICE例程里把A=10去掉的话,能正常卸载设备,不发生蓝屏的问题.

难道在ADDDEVICE里不能初始化ULONG类型的变量?我想不可能这样吧

详细代码看看。。。。。

代码如下：
///////////////////////////////
lianxi.c:
///////////////////////////////
#include "lianxi.h"
#include "guid.h"
#define INITGUID
NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath)
{
#if DBG
DbgPrint("LIANXI:enter the DriveEntry.\n");
DbgPrint("the irql is %x\n",KeGetCurrentIrql());
#endif


    DriverObject->MajorFunction[IRP_MJ_CREATE]=liandispatch;
DriverObject->MajorFunction[IRP_MJ_CLOSE]=liandispatch;
DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL]=liandispatch;
DriverObject->MajorFunction[IRP_MJ_PNP]=lianpnphandle;
    DriverObject->MajorFunction[IRP_MJ_SYSTEM_CONTROL]=lianwmi;
DriverObject->DriverExtension->AddDevice=AddDevice;
DriverObject->DriverUnload=lianunload;
return STATUS_SUCCESS;
}

VOID lianunload(PDRIVER_OBJECT DriverObject)
{

DbgPrint("LIANXI:Unload\n");
DbgPrint("the irql is %x\n",KeGetCurrentIrql());
return;

}

NTSTATUS AddDevice(IN PDRIVER_OBJECT DriverObject,
  IN PDEVICE_OBJECT PDO )

{
PDEVICE_OBJECT FDO;
PLIAN_DEVICE_EXTENSION DEX;
NTSTATUS status;

DbgPrint("LIANXI:enter the AddDevice .\n");
DbgPrint("the irql is %x\n",KeGetCurrentIrql());
status=IoCreateDevice(DriverObject,
                 sizeof(PLIAN_DEVICE_EXTENSION),
 NULL,
 FILE_DEVICE_UNKNOWN,
 0,
 FALSE,
 &FDO);
if(!NT_SUCCESS(status))
{
 DbgPrint("LIANXI:create device failed.\n");
      return status;
}

DEX=(PLIAN_DEVICE_EXTENSION)FDO->DeviceExtension;

    status=IoRegisterDeviceInterface(PDO,
                      &SAMPLE,
 NULL,
 &DEX->LINKNAME
 );
if(!NT_SUCCESS(status))
{
     DbgPrint("LIANXI:register deviceinterface failed.\n");
IoDeleteDevice(FDO);
return status;
}
IoSetDeviceInterfaceState(&DEX->LINKNAME,TRUE);

DEX->LOWDEVICE=IoAttachDeviceToDeviceStack(FDO,PDO);

     if (!DEX->LOWDEVICE)
{
DbgPrint("LIANXI:attact FDO to PDO failed.\n");
lianunload(DriverObject);
// return  STATUS_UNSUCCESSFUL;
}
DEX->PDO=PDO;
DEX->FDO=FDO;
        FDO->Flags |= DO_DIRECT_IO;
        FDO->Flags |= DO_POWER_PAGABLE;
        FDO->Flags &= ~DO_DEVICE_INITIALIZING;

        DEX->ADD=10;
DbgPrint("LIANXI:We have adddevice successed.\n");

return STATUS_SUCCESS;
      
}


NTSTATUS lianpnphandle(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{

PIO_STACK_LOCATION     IrpStack;
    PLIAN_DEVICE_EXTENSION DEX;
ULONG                  MinorFunction ;
ULONG                  MajorFunction;
    NTSTATUS               status ;
  
  



    DEX=(PLIAN_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
    IrpStack = IoGetCurrentIrpStackLocation(Irp);
    MinorFunction = IrpStack->MinorFunction;
MajorFunction=IrpStack->MajorFunction;
DbgPrint("LIANXI:enter the PnP,MajorFunction:0x%x,MinorFunction:0x%x\n",MajorFunction,MinorFunction);
      //然后把这个Minor Function传递给下一个设备栈：
DbgPrint("the irql is %x\n",KeGetCurrentIrql());
    IoSkipCurrentIrpStackLocation(Irp);
    status = IoCallDriver( DEX->LOWDEVICE, Irp);
   if( MinorFunction==IRP_MN_START_DEVICE)
   {
  DbgPrint("LIANXI:IRP_MN_START_DEVICE.\n");

   }
   if( MinorFunction==IRP_MN_QUERY_REMOVE_DEVICE)
   {
  DbgPrint("LIANXI:IRP_MN_QUERY_REMOVE_DEVICE.\n");
   }
if( MinorFunction==IRP_MN_QUERY_DEVICE_RELATIONS)
   {
  DbgPrint("LIANXI:IRP_MN_QUERY_DEVICE_RELATIONS.\n");
   }
if( MinorFunction==IRP_MN_QUERY_CAPABILITIES)
   {
  DbgPrint("LIANXI:IRP_MN_QUERY_CAPABILITIES.\n");
   }
if( MinorFunction==IRP_MN_FILTER_RESOURCE_REQUIREMENTS)
   {
  DbgPrint("LIANXI:IRP_MN_FILTER_RESOURCE_REQUIREMENTS.\n");
   }

if( MinorFunction==IRP_MN_QUERY_PNP_DEVICE_STATE)
   {
  DbgPrint("LIANXI:IRP_MN_QUERY_PNP_DEVICE_STATE.\n");
   }

    //处理“即插即用”次功能代码：
    //当Minor Function等于IRP_MN_REMOVE_DEVICE时，说明有设备被拔出或卸下，这时要取消资源分配并删除设备：
    if(IRP_MN_REMOVE_DEVICE==MinorFunction)
    {
DbgPrint("LIANXI:IRP_MN_REMOVE_DEVICE.\n");

        //取消设备接口：
        IoSetDeviceInterfaceState(&DEX->LINKNAME, FALSE);
        RtlFreeUnicodeString(&DEX->LINKNAME);
        
        //调用IoDetachDevice()把fdo从设备栈中脱开：
        if (DEX->LOWDEVICE)
            IoDetachDevice(DEX->LOWDEVICE);
        //删除fdo：
        IoDeleteDevice(DeviceObject);
// DbgPrint("LIANXI:We have remove the device.\n");
    }


  DbgPrint("the return status is 0x%x\n",status);
    //返回值：
    return status;
// DbgPrint("the return status is 0x%x",status);
}
///////////////////////////////////////
lianxi.h
////////////////////////////////////////
#include "wdm.h"
#include "lianioctl.h"
typedef struct _LIAN_DEVICE_EXTENSION
{
PDEVICE_OBJECT FDO;
PDEVICE_OBJECT PDO;
PDEVICE_OBJECT LOWDEVICE;
UNICODE_STRING LINKNAME;
ULONG          ADD;


} LIAN_DEVICE_EXTENSION, *PLIAN_DEVICE_EXTENSION;

VOID lianunload(IN PDRIVER_OBJECT DriverObject);
NTSTATUS liandispatch(IN PDEVICE_OBJECT FDO,IN PIRP Irp);
NTSTATUS AddDevice(IN PDRIVER_OBJECT DriverObject,
IN PDEVICE_OBJECT PDO );
NTSTATUS lianpnphandle(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS lianpower(IN PDEVICE_OBJECT DeviceObject,IN PIRP  Irp);
NTSTATUS lianwmi(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);

代码已经给出，大家看看吧！

wowocock哪去了？？？？

ding !!!!