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Date/Time: Tue, 04 Nov 2025 11:13:55 +0000

[Locked] - SubmitNewSingleOrder on binary encoding's IsParentOrder byte is 201 but I expected 197

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[2022-01-12 00:52:56] #1 [Go To First Post]
1+1=10 - Posts: 270
Hi SC Engineering, For the SubmitNewSingleOrder binary message I expected IsParentOrder's byte to be 197 but found it was actually 201. I don't think it makes much difference to my trading but I wanted to make sure there's not an documented field. See why I expected 197 below:     uint16_t Size; //0:     uint16_t Type; //2:     char Symbol[SYMBOL_LENGTH]; //4: + 64     char Exchange[EXCHANGE_LENGTH]; //68: + 16     char TradeAccount[TRADE_ACCOUNT_LENGTH]; //84: + 32     char ClientOrderID[ORDER_ID_LENGTH]; //116: + 32     OrderTypeEnum OrderType; //148: i32     BuySellEnum BuySell; //152: i32     double Price1; //160:     double Price2; //168:     double Quantity; //176:     TimeInForceEnum TimeInForce; //184: i32     t_DateTime GoodTillDateTime; //188: i64     uint8_t IsAutomatedOrder; //196:     uint8_t IsParentOrder; //197:     char FreeFormText[ORDER_FREE_FORM_TEXT_LENGTH]; but it is actually:     t_DateTime GoodTillDateTime; //188: i64     uint8_t IsAutomatedOrder; //196 or 200 ??:     uint8_t IsParentOrder; //201:     char FreeFormText[ORDER_FREE_FORM_TEXT_LENGTH];
0x Thank you

[2022-01-22 23:40:16] #2 [Go To First Post]
DTC Engineering - Posts: 320
This relates to structure member alignment which for this structure is: #pragma pack(push, 8) Refer to: https://docs.microsoft.com/en-us/cpp/build/reference/zp-struct-member-alignment?view=msvc-170 Date Time Of Last Edit: 2022-01-23 00:02:26
0x Thank you

[2022-01-22 23:58:18] #3 [Go To First Post]
1+1=10 - Posts: 270
Thanks for the response! I should have actually deleted this message as afterwards I learned you can’t get live CME data through DTC. Anyway, I must have been confused about how uint8_t get aligned on #pragma pack(push, 8). I’ll read through the C++ docs and figure it out.
0x Thank you

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