struct _IO_SECURITY_CONTEXT// Size=0x18
{
    struct _SECURITY_QUALITY_OF_SERVICE * SecurityQos;// Offset=0x0 Size=0x8
    struct _ACCESS_STATE * AccessState;// Offset=0x8 Size=0x8
    unsigned long DesiredAccess;// Offset=0x10 Size=0x4
    unsigned long FullCreateOptions;// Offset=0x14 Size=0x4
};