C# P/Invoke array of arrays

Question

I searched this question but google gave nothing. Is there any way to marshal array of arrays?

//C
typedef struct SomeStruct
{
    float matrix[7][12];
} SomeStruct;

//C#
public struct SomeStruct
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = ???)]
    public float[][] matrix;
}

David Heffernan · Accepted Answer · 2015-09-19 11:26:34Z

1

You have to use a linear array in the C# code:

public struct SomeStruct
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 7*12)]
    public float[] matrix;
}

You'll need to convert from a 2D index to a linear index for convenience.

int LinearIndex(int i, int j)
{
    return i*12 + j;
}

answered Sep 19, 2015 at 11:26

David Heffernan

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