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POHow to byte array received from socket, to C# structure
 

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  1. POHow to byte array received from socket, to C# structure
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    <p>I have to Develop a Service (C#) which read data from Network Device via TCP Socket and convert this is C# structure.</p> <p>I am basing on existing, old Delphi application which is doing all this stuff and I have to migrate logic in C#. </p> <p>EDITED: I got a snapshot from C-Source of original data-structure:</p> <pre><code>struct _RequestMsgStruct { UCHAR request_ver; //In DELPHI it is represented as Byte USHORT mac_addr[3]; /* MAC Address */ UINT product_type; //In DELPHI - Cardinal UCHAR supply_type; //In DELPHI - Byte short reserved0; //In DELPHI - SmallInt UCHAR oper_ver[4]; //In DELPHI - CARDINAL !!! USHORT brd_id; //In DELPHI - WORD unsigned short exp_id1; //In DELPHI - WORD //In DELPHI - string[15]; //Array [0..15] of char; UCHAR serial_no[16]; /* Serial Number. 16th char have to be NULL */ UCHAR _name[32]; /* Name */ //Length of payload may vary //In DELPHI - string[31] float data_avg; //In DELPHI - Single ULONG key[5]; //In DELPHI - array [0..19] of Byte }__attribute__ ((packed)); </code></pre> <p>There is Delphi Packed record with over 200 fields of different types... it look approximately like:</p> <pre><code> TREC_DATA = packed record ID : Byte; MAC_ADDRESS : array [0..5] of Byte; fieldCard : cardinal; fieldSI : SmallInt; fieldW : WORD; SERIAL_NUMBER : string[15]; //Array [0..15] of char; fieldSingle : Single; fieldArrOfB : array [0..19] of Byte; end; </code></pre> <p>To move byte array to structure in Delphi there is next code:</p> <pre><code>Move(inBytesArr[StartIdx], DelphiStruct, aMsgSize) </code></pre> <p>To convert string files (e.g. SERIAL_NUMBER) there is also such code:</p> <pre><code>var pc: Pchar; ... pc := @inBytesArr[StartIdx + SerialN_Pos_Idx]; DelphiStruct.SERIAL_NUMBER := pc; </code></pre> <p>I having deal with such conversion for first time and I don't know from where to start:</p> <ul> <li><p>How to convert this structure to c#? -- Should I use <code>LayoutKind.Sequential</code> or <code>LayoutKind.Explicit</code>, with or wiyhout <code>[FieldOffset(N)]</code> attribute? -- How I have to declare array of bytes in target c# structure: as <code>fixed</code> buffer or using <code>[MarshalAs(UnmanagedType.ByValArray...)]</code> attribute?</p></li> <li><p>Which is better way to marshal input bytes array to final C# structure: using <code>Marshal.PtrToStructure</code> or GCHandle.Alloc(bytes, GCHandleType.Pinned) + <code>AddrOfPinnedObject</code>?</p></li> </ul> <p>Please help me, at least, to get start point in understating from where i need to start.</p>
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    1. COI think you've given us the wrong structure declaration. You need to give us the one that matches what is on the wire. I guess that's in the C program. You are confusing us with these references to Delphi `string[]` types.
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    2. CO@DavidHeffernan, I got a snapshot of original C-Structure. Updated in question.
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    3. COYou can accept Dennis's answer
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