struct _IO_WORKITEM// Size=0x30
{
    struct _WORK_QUEUE_ITEM WorkItem;// Offset=0x0 Size=0x10
    void  ( * Routine)(void * ,void * ,struct _IO_WORKITEM * );// Offset=0x10 Size=0x4
    void * IoObject;// Offset=0x14 Size=0x4
    void * Context;// Offset=0x18 Size=0x4
    unsigned long Type;// Offset=0x1c Size=0x4
    struct _GUID ActivityId;// Offset=0x20 Size=0x10
};