_PORT_MESSAGE

//0x28 bytes (sizeof) struct _PORT_MESSAGE { union { struct { SHORT DataLength; //0x0 SHORT TotalLength; //0x2 } s1; //0x0 ULONG Length; //0x0 } u1; //0x0 union { struct { SHORT Type; //0x4 SHORT DataInfoOffset; //0x6 } s2; //0x4 ULONG ZeroInit; //0x4 } u2; //0x4 union { struct _CLIENT_ID ClientId; //0x8 double DoNotUseThisField; //0x8 }; ULONG MessageId; //0x18 union { ULONGLONG ClientViewSize; //0x20 ULONG CallbackId; //0x20 }; };