A simple way of doing it is:
[ StructLayout( LayoutKind.Sequential ) ]
public struct MyStruct
{
public Initialize( ) // can't have a def. ctor... :(
{
b = new ushort[ 4 ];
c = new ushort[ 10 ];
}
public ushort a;
[ MarshalAs( UnmanagedType.ByValArray
, SizeConst = 4
, ArraySubType = UnmanagedType.U2 ) ]
public ushort[] b;
[ MarshalAs( UnmanagedType.ByValArray
, SizeConst = 10
, ArraySubType = UnmanagedType.U2 ) ]
public ushort[] c;
}
hope it helps...
jmn
On Thu, 6 Jun 2002 11:21:20 +0200, Pierre <[EMAIL PROTECTED]> wrote:
>Hi,
>I have a structure than contains two arrays with the same value type but
>different lenght. Looking on past messages I got some interesting tips. The
>C++ structure is:
>
>struct MyStruct
>{
> ushort a;
> ushort[4] b;
> ushort[10] c;
>}
>
>In C# I translated as:
>
>[StructLayout(LayoutKind.Sequential)]
>struct MyStruct
>{
> ushort a;
> public ushort_vector_4 b;
> public ushort_vector_10 c;
>
> [StructLayout(LayoutKind.Explicit)]
> public struct ushort_vector_4
> {
> public const int DataLength = 4;
> [FieldOffset(0)]private ushort Header;
> [FieldOffset((DataLength - 1) * 2)]private ushort Footer;
> public int Length { get { return DataLength; } }
> public unsafe ushort this[int index]
> {
> get
> {
> if ( (index < 0) || (index >= DataLength) )
> {
> throw new IndexOutOfRangeException();
> }
> fixed (ushort *head = &Header)
> return *(head+index);
> }
> set
> {
> if ( (index < 0) || (index >= DataLength) )
> {
> throw new IndexOutOfRangeException();
> }
> fixed (ushort *head = &Header)
> *(head +index) = value;
> }
> }
> }
>
> [StructLayout(LayoutKind.Explicit)]
> public struct ushort_vector_10
> {
> public const int DataLength = 10;
> [FieldOffset(0)]private ushort Header;
> [FieldOffset((DataLength - 1) * 2)]private ushort Footer;
> public int Length { get { return DataLength; } }
> public unsafe ushort this[int index]
> {
> get
> {
> if ( (index < 0) || (index >= DataLength) )
> {
> throw new IndexOutOfRangeException();
> }
> fixed (ushort *head = &Header)
> return *(head+index);
> }
> set
> {
> if ( (index < 0) || (index >= DataLength) )
> {
> throw new IndexOutOfRangeException();
> }
> fixed (ushort *head = &Header)
> *(head +index) = value;
> }
> }
> }
>}
>
>There is an high level of redundancy of the code. Is it possibile to use
>only one internal struct defining the size externally ?
>
>Thank you
>Pierre
>
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