WDF_DECLARE_CONTEXT_TYPE_WITH_NAME

#define WDF_DECLARE_CONTEXT_TYPE_WITH_NAME(_contexttype, _castingfunction) \
                                                                        \
WDF_DECLARE_TYPE_AND_GLOBALS(                                           \
    _contexttype,                                                       \
    WDF_GET_CONTEXT_TYPE_INFO(_contexttype),                            \
    NULL,                                                               \
    WDF_TYPE_DEFAULT_SECTION_NAME)                                      \
                                                                        \
WDF_DECLARE_CASTING_FUNCTION(_contexttype, _castingfunction)

WDF_DECLARE_CONTEXT_TYPE_WITH_NAME的主要功能是根据提供的结构体信息填充系统定义的结构体WDF_OBJECT_CONTEXT_TYPE_INFO各成员的信息，并生成一个全局的对象。

typedef struct _WDF_OBJECT_CONTEXT_TYPE_INFO {
    //
    // The size of this structure in bytes
    //
    ULONG Size;

    //
    // String representation of the context's type name, i.e. "DEVICE_CONTEXT"
    //
    PCHAR ContextName;

    //
    // The size of the context in bytes.  This will be the size of the context
    // associated with the handle unless
    // WDF_OBJECT_ATTRIBUTES::ContextSizeOverride is specified.
    //
    size_t ContextSize;

    //
    // If NULL, this structure is the unique type identifier for the context
    // type.  If != NULL, the UniqueType pointer value is the unique type id
    // for the context type.
    //
    PCWDF_OBJECT_CONTEXT_TYPE_INFO UniqueType;

    //
    // Function pointer to retrieve the context type information structure
    // pointer from the provider of the context type.  This function is invoked
    // by the client driver's entry point by the KMDF stub after all class
    // drivers are loaded and before DriverEntry is invoked.
    //
    PFN_GET_UNIQUE_CONTEXT_TYPE EvtDriverGetUniqueContextType;

} WDF_OBJECT_CONTEXT_TYPE_INFO, *PWDF_OBJECT_CONTEXT_TYPE_INFO;

全局的对象名称使用WDF_TYPE_NAME_TO_TYPE_INFO宏生成：

#define WDF_TYPE_NAME_TO_TYPE_INFO(_contexttype) \
      _WDF_ ## _contexttype ## _TYPE_INFO

故实现代码如下：

WDF_EXTERN_C                                                            \
__declspec(allocate( _section ))                                        \
__declspec(selectany)                                                   \
extern const WDF_OBJECT_CONTEXT_TYPE_INFO                               \
WDF_TYPE_NAME_TO_TYPE_INFO(_contexttype) =                              \
{                                                                       \
    sizeof(WDF_OBJECT_CONTEXT_TYPE_INFO),                               \
    #_contexttype,                                                      \
    sizeof(_contexttype),                                               \
    _UniqueType,                                                        \
    _GetUniqueType,                                                     \
};                                                                      \

其中：bUniqueType为对象的指针，GetUniqueType为NULL