[Mono-dev] StructLayout with misaligned offsets

[Zoltan Varga]

            Hi,

 This is a known bug and it is tracked as:

http://bugzilla.ximian.com/show_bug.cgi?id=77788

       Zoltan

On 4/12/06, tcmichals <tcmichals at msn.com> wrote:
> namespace testCode
> {
>     class Program
>     {
>         [StructLayout(LayoutKind.Sequential, Pack = 1 /*, CharSet =
> CharSet.Ansi */)/*, Serializable*/]
>         public struct tagSDK
>         {
>
>             [MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
>             public ushort[] inter;
>             public ushort integ;
>             public ushort mode;
>             public ushort imaging;
>             [MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
>             public ushort[] Avg;
>             public ushort numOfIntervals;
>             public tagSDK(int val)
>             {
>                 this.inter = new ushort[12];
>                 this.inter[0] = 0;
>                 this.Avg = new ushort[12];
>                Avg[0] = 0;
>                 integ = 0;
>                 imaging = 0;
>                 imaging2 = 0;
>                 numOfIntervals = 0;
>                 mode = 0;
>            }
>         };
>         static void Main(string[] args)
>         {
>             tagSDK t= new tagSDK(0);
>             Console.WriteLine("Hello World");
>         }
>     }
> }
>
> When I attempt to execute the following program the following message is
> generated
> * ERROR **: file object.c: line 509 (compute_class_bitmap): assertion
> failed: ((field->offset % sizeof(gpointer)) == 0)
>
> If I change The alignment of Avg to be on a 4 byte boundry it works,
> sugguestions?
>
>
>
>
>
>
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