C# Union Structure Marshalling

Question

I\'m trying to integrate Video4Linux in my managed application. Indeed I\'ve declared all required structures and relative ioctl. In this question I present two i

Answer 1

The problem has been solved by forcing the structure size to the actual one (204, in my case), and remove the array field RawData (as suggested by David Heffernan).

Indeed:

[StructLayout(LayoutKind.Explicit, Pack = 4, CharSet = CharSet.Ansi, Size = 204)]
public struct Format
{
    public Format(BufferType bufferType)
    {
        Type = bufferType;
        Pixmap = new PixmapFormat();
    }

    public Format(BufferType bufferType, PixmapFormat pixmapFormat)
    {
        Type = bufferType;
        Pixmap = pixmapFormat;
    }

    [FieldOffset(0)]
    public BufferType Type;

    [FieldOffset(4)]
    public PixmapFormat Pixmap;
}

Of course, Marshal.SizeOf(typeof(Format)) == 204.