Marshal.SizeOf - .NET Framework

Below is my unmanaged structure:

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    [StructLayout(LayoutKind.Sequential, Pack = 1)]

    public struct LasHeader

    {

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]

        public string FileSignature;
 
        [MarshalAs(UnmanagedType.U2)]

        public UInt16 FileSourceId;
 
        [MarshalAs(UnmanagedType.U2)]

        public ushort Reserved;
 
        [MarshalAs(UnmanagedType.U4)]

        public ulong ProjectId1;
 
        [MarshalAs(UnmanagedType.U2)]

        public ushort ProjectId2;
 
        [MarshalAs(UnmanagedType.U2)]

        public ushort ProjectId3;
 
        [MarshalAs(UnmanagedType.U1, SizeConst = 8)]

        public byte[] ProjectId4;
 
        [MarshalAs(UnmanagedType.U1)]

        public byte VersionMajor;
 
        [MarshalAs(UnmanagedType.U1)]

        public byte VersionMinor;
 
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]

        public string SystemIdentifier;
 
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]

        public string GeneratingSoftware;
 
        [MarshalAs(UnmanagedType.U2)]

        public ushort FileCreationDayOfYear;
 
        [MarshalAs(UnmanagedType.U2)]

        public ushort FileCreationYear;
 
        [MarshalAs(UnmanagedType.U2)]

        public ushort HeaderSize;
 
        [MarshalAs(UnmanagedType.U4)]

        public ulong OffsetToData;
 
        [MarshalAs(UnmanagedType.U4)]

        public ulong NumberOfVariableLengthRecords;
 
        [MarshalAs(UnmanagedType.U1)]

        public byte PointDataFormatId;
 
        [MarshalAs(UnmanagedType.U2)]

        public ushort PointDataRecordLength;
 
        [MarshalAs(UnmanagedType.U4)]

        public ulong NumberOfPointRecords;
 
        [MarshalAs(UnmanagedType.U4, SizeConst = 5)]

        public ulong[] NumberOfPointByReturn;
 
        [MarshalAs(UnmanagedType.R8)]

        public double XScaleFactor;
 
        [MarshalAs(UnmanagedType.R8)]

        public double YScaleFactor;
 
        [MarshalAs(UnmanagedType.R8)]

        public double ZScaleFactor;
 
        [MarshalAs(UnmanagedType.R8)]

        public double XOffset;
 
        [MarshalAs(UnmanagedType.R8)]

        public double YOffset;
 
        [MarshalAs(UnmanagedType.R8)]

        public double ZOffset;
 
        [MarshalAs(UnmanagedType.R8)]

        public double MaxX;
 
        [MarshalAs(UnmanagedType.R8)]

        public double MinX;
 
        [MarshalAs(UnmanagedType.R8)]

        public double MaxY;
 
        [MarshalAs(UnmanagedType.R8)]

        public double MinY;
 
        [MarshalAs(UnmanagedType.R8)]

        public double MaxZ;
 
        [MarshalAs(UnmanagedType.R8)]

        public double MinZ;

    }

When I try to get the size of this struct using Marshal.SizeOf(), I get the following ArgumentException:

Type 'LasHeader' cannot be marshaled as an unmanaged structure; no meaningful size or offset can be computed.

Any ideas ?

Thank you.

Sep 18 '07 #1

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