请高手们看看我的这段代码，帮忙指出他的致命错误在哪

我最近刚开始学驱动设计，写了一个小程序，编译没有错误，装载到系统之后系统马上会蓝屏（winxp），提示beginning dump of physicy memory,错误信息是　0x0000007e(0xc0000005,0x805b639c,0xf9e78864,0xf9e78560) 其他例如驱动装入基值没有告诉，代码如下：
/****************  wmd.c  ******************/

#define INITGUID

#include \"wdm.h\"

#include \"mywdm.h\"  /*包含了扩展对象的定义*/

#include \"guid.h\"

NTSTATUS MyWdmAddDevice(IN PDRIVER_OBJECT DriverObject, IN PDEVICE_OBJECT pdo);
void MyWdmUnload(IN PDRIVER_OBJECT DriverObject);
NTSTATUS MyWdmCreate(IN PDEVICE_OBJECT fdo, IN PIRP irp);
NTSTATUS MyWdmClose(IN PDEVICE_OBJECT fdo, IN PIRP irp);
NTSTATUS MyWdmWrite(IN PDEVICE_OBJECT fdo, IN PIRP irp);
NTSTATUS MyWdmRead(IN PDEVICE_OBJECT fdo, IN PIRP irp);
#pragma code_seg(\"INIT\")

NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegPath)
{
NTSTATUS status=STATUS_SUCCESS;
DriverObject－>DriverExtension>AddDevice=MyWdmAddDevice;
DriverObject->DriverUnload=MyWdmUnload;

DriverObject->MajorFunction[IRP_MJ_CREATE]=MyWdmCreate;
DriverObject->MajorFunction[IRP_MJ_CLOSE]=MyWdmClose;
DriverObject->MajorFunction[IRP_MJ_WRITE]=MyWdmWrite;
DriverObject->MajorFunction[IRP_MJ_READ]=MyWdmRead;
return(status);
}

#pragma code_seg()


#pragma code_seg(\"PAGE\")

NTSTATUS MyWdmAddDevice(IN PDRIVER_OBJECT DriverObject, IN PDEVICE_OBJECT pdo)
{
NTSTATUS status=STATUS_SUCCESS;
PDEVICE_OBJECT fdo;
PMyDeviceExtension dx;
status=IoCreateDevice(DriverObject, sizeof(MyDeviceExtension), NULL, FILE_DEVICE_UNKNOWN, 0, FALSE, &fdo);

if (!NT_SUCCESS(status))
{
IoDeleteDevice(fdo);
return(status);
}

dx=(MyDeviceExtension *)fdo->DeviceExtension;
    status=IoRegisterDeviceInterface(pdo, &MYGUID, NULL, dx->ifSysLinkName);

if (!NT_SUCCESS(status))
{
IoDeleteDevice(fdo);
return(status);
}

status=IoSetDeviceInterfaceState(dx->ifSysLinkName, TRUE);

if (!NT_SUCCESS(status))
{
IoDeleteDevice(fdo);
return(status);
}

dx->NextStackDevice=IoAttachDeviceToDeviceStack(fdo, pdo);
fdo->Flags&=~DO_DEVICE_INITIALIZING ;
fdo->Flags|=DO_BUFFERED_IO ;
return(status);
}

void MyWdmUnload(IN PDRIVER_OBJECT DriverObject)
{
PMyDeviceExtension dx;
dx=(PMyDeviceExtension)DriverObject->DeviceObject->DeviceExtension;
RtlFreeUnicodeString(dx->ifSysLinkName);
IoDetachDevice(dx->NextStackDevice);
}

NTSTATUS MyWdmCreate(IN PDEVICE_OBJECT fdo, IN PIRP irp)
{
NTSTATUS status=STATUS_SUCCESS;
PMyDeviceExtension dx;
dx=(PMyDeviceExtension)fdo->DeviceExtension;
dx->data=0;
IoCompleteRequest(irp, IO_NO_INCREMENT);
return(status);
}

NTSTATUS MyWdmClose(IN PDEVICE_OBJECT fdo, IN PIRP irp)
{
NTSTATUS status=STATUS_SUCCESS;
IoCompleteRequest(irp, IO_NO_INCREMENT);
return(status);
}

NTSTATUS MyWdmWrite(IN PDEVICE_OBJECT fdo, IN PIRP irp)
{
NTSTATUS status=STATUS_SUCCESS;
int * buffer;
PMyDeviceExtension dx=(PMyDeviceExtension)fdo->DeviceExtension;
buffer=(int *)irp->AssociatedIrp.SystemBuffer;
dx->data+=(* buffer);

if (dx->data >= 10000)
{
dx->data=0;
}

IoCompleteRequest(irp, IO_NO_INCREMENT);
return(status);
}

NTSTATUS MyWdmRead(IN PDEVICE_OBJECT fdo, IN PIRP irp)
{
NTSTATUS status=STATUS_SUCCESS;
PMyDeviceExtension dx;
int * buffer;
dx=(PMyDeviceExtension)fdo->DeviceExtension;
buffer=(int *)irp->AssociatedIrp.SystemBuffer;
(* buffer)=dx->data;
IoCompleteRequest(irp, IO_NO_INCREMENT);
return(status);
}

#pragma code_seg()

你有什么调试工具吗？softice之类的

我有阿，我安装了driverStudio,有softice

试这个如没问题,再加上自己所写的,一步步找就知错误在哪 !

#include <ntddk.h>

void DriverUnload(PDRIVER_OBJECT pDriverObject)
{
    DbgPrint(\"Driver unloading\\n\");
}

NTSTATUS DriverEntry(PDRIVER_OBJECT DriverObject, PUNICODE_STRING RegistryPath)
{
    DriverObject->DriverUnload = DriverUnload;

    DbgPrint(\"Hello, World\\n\");

    return STATUS_SUCCESS;
}

试这个如没问题,再加上自己所写的,一步步找就知错误在哪 !
[quote] #include <ntddk.h>

void DriverUnload(PDRIVER_OBJECT pDriverObject)
{
    DbgPrint(\"Driver unloading\\n\");
}

NTSTATUS DriverEntry(PDRIVER_OBJECT DriverObject, PUNICODE_STRING RegistryPath)
{
    DriverObject->DriverUnload = DriverUnload;

    DbgPrint(\"Hello, World\\n\");

    return STATUS_SUCCESS;
}

[/quote]
KMK大虾所言极是,一口吃个胖子就是这滋味