创建一个控制设备对象

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//创建一个控制设备对象 (Ring3.exe交互)
DEVICE_OBJECT* CreateDevice(WCHAR* DeviceName,
    WCHAR* LinkName,
    DRIVER_OBJECT* DriverObject,
    BOOLEAN IsDeviceExclusive)
{
    NTSTATUS Status;
    UNICODE_STRING v1;
    UNICODE_STRING v2;
    DEVICE_OBJECT* DeviceObject = NULL;   //一维指针
    PDEVICE_EXTENSION DeviceExtension;    //设备扩展的指针  ????????????

    RtlInitUnicodeString(&v1, DeviceName);
    RtlInitUnicodeString(&v2, LinkName);

    Status = IoCreateDevice(
        DriverObject,
        sizeof(DEVICE_EXTENSION),
        &v1,
        FILE_DEVICE_UNKNOWN,
        0,
        IsDeviceExclusive,
        &DeviceObject);   //二维指针
    if (NT_SUCCESS(Status) == FALSE)
    {
        return NULL;
    }

    //设备扩展自定义的设备对象的私有数据
    DeviceExtension = (PDEVICE_EXTENSION)DeviceObject->DeviceExtension;  //系统分配出来的设备扩展
    DeviceExtension->chDriver = '\0';
    DeviceExtension->pFSDeviceObject = NULL;   //不需要挂载到设备栈
    DeviceExtension->DeviceType = MAIN_CTRL;

    DeviceObject->Flags |= DO_BUFFERED_IO;

    Status = IoCreateSymbolicLink(&v2, &v1);
    if (NT_SUCCESS(Status) == FALSE)
    {
        IoDeleteDevice(DeviceObject);
        return NULL;
    }

    return DeviceObject;
}