Re: How to read binary data into a STRUCT?
From: Dennis Myrén (dennis_at_oslokb.no)
Date: 09/20/04
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Date: Mon, 20 Sep 2004 11:12:53 +0200
And of course the "buff" byte array has to be filled with the appropriate
data.
--
Regards,
Dennis JD Myrén
Oslo Kodebureau
"Dennis Myrén" <dennis@oslokb.no> wrote in message
news:F9x3d.8048$WW4.124390@news4.e.nsc.no...
> byte [] buff = new byte [Marshal.SizeOf(STRUCT)];
> IntPtr ptr = Marshal.AllocHGlobal(buff.Length);
> Marshal.Copy(buff, 0x0, ptr, buff.Length);
> STRUCT result = (STRUCT) Marshal.PtrToStructure(ptr, typeof(STRUCT));
> Marshal.FreeHGlobal(ptr);
>
> [ StructLayout( LayoutKind.Sequential, Pack = 0x1 ) ]
> struct STRUCT
> {
> public ushort field1;
> [ MarshalAs( UnmanagedType.ByValArray, SizeConst = 0x3C ) ]
> public byte [] field2;
> ...
> }
>
> --
> Regards,
> Dennis JD Myrén
> Oslo Kodebureau
> "Michael Van Altena via .NET 247" <anonymous@dotnet247.com> wrote in
> message news:OWJ957rnEHA.3428@TK2MSFTNGP11.phx.gbl...
> I'm trying to figure out how to read a formatted binary file into a
> structure definition in C#. I've tried using the "StructLayout" attribute
> with both LayoutKind.Explicit and LayoutKind.Sequential options. I can
> get this to work successfully, but only when I'm NOT dealing with arrays
> in the structure definition.
>
> For example: In C, you are able to simply read a binary file into a
> structure as follows:
>
> ---------------------------------------------------------------------------------------------------------
> /* The structure definition */
> typedef struct
> {
> short anShorts[5];
> char strString[32];
> double adDoubles[10];
> } FORMATDEF;
>
> /* Open the file */
> FILE * pFile;
> pFile = fopen("Test.bin", "rb");
>
> /* Read into the structure */
> FORMATDEF structFormatDef;
> fread(pFile, &structFormatDef, sizeof(FORMATDEF));
>
> /* Close the file */
> fclose(pFile);
> ---------------------------------------------------------------------------------------------------------
>
> Note: The above example is using arrays in the STRUCT definition. This is
> the main root of the problem I am trying to solve. (i.e. this is like the
> StructLayout attribute with the LayoutKind.Sequential option (Pack=8 in my
> particular problem) - but I can't get this to work with arrays in the
> structure definition in C#).
>
> In C++ another possibility would be to use a UNION definition instead of a
> class to union a structure definition with an array of characters (bytes),
> and then just read in the bytes and access the data through the structure.
> (i.e. this is like the StructLayout attribute with the LayoutKind.Explicit
> option - but I can't get this to work with arrays in the structure
> definition in C#).
>
> I can't believe with all the great features that C# has to offer, that
> there isn't a simple way to read in a binary file into a formatted
> structure and/or class. Can someone out there tell me what I'm missing?
>
> Thanks,
>
> Michael.
>
> --------------------------------
> From: Michael Van Altena
>
> -----------------------
> Posted by a user from .NET 247 (http://www.dotnet247.com/)
>
> <Id>7dFE/rBp9kufEMK5ukIchQ==</Id>
>
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