FFSTPARMS

 typedef struct _FFSTPARMS { ULONG            packet_size; ULONG            packet_revision_number; PVOID            module_name; ULONG            probe_ID; ULONG            severity; ULONG            template_record_ID; PMSGINSDATA      pMsgInsData; ULONG            probe_flags; PDUMPUSERDATA    pDumpUserData; ULONG            log_user_data_length; PVOID            log_user_data; } FFSTPARMS;

typedef  FFSTPARMS   * PFFSTPARMS ; 

Use appropriate packet_revision_number to indicate whether character data in the parameter packet is in UniCode or ASCII format.