[DOTNET] How to marshal arrays in structures (C#)

[Henrik Christiansen Engmark]

Hi,

How do I marshal an array of strings in a structure. My unmanaged struct
looks like this:

Unmanaged struct (C++):

typedef WCHAR String80[81];
typedef struct
{
        double fNumbers[50];
        String80 chString[100];
}

I have tried this in the managed struct (C#)

struct
{
        [MarshalAs(UnmanagedType.ByValArray,
ArraySubType=UnmanagedType.LPArray, SizeConst=50)] public double[] numbers;
        [MarshalAs(UnmanagedType.ByValArray,
ArraySubType=UnmanagedType.LPWStr, SizeConst=100)] public string[] strings;
}

But when I call Marshal.SizeOf()) it fails with: "...can not be marshaled as
an unmanaged structure; no meaningful size or offset can be computed"
If I comment out the array of strings it is ok, so the array of double is
ok.

Any idea of what to do?

Regards,
Henrik.

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