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static extern uint GetFontData(IntPtr hdc, uint dwTable, uint dwOffset,

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    /// If this parameter is zero, GetFontData returns the size of the font metrics table specified in the <paramref name="dwTable"/> parameter. </param>

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    private static extern uint GetFontData(IntPtr hdc, uint dwTable, uint dwOffset, [Out] byte[] lpvBuffer, uint cbData);

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            uint byteCount = GetFontData(hdc, nameTableKey, 0, fontData, 0);

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            // Now init the byte array and load the data by calling GetFontData once again

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            GetFontData(hdc, nameTableKey, 0, fontData, byteCount);

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Documentation

[GetFontData] on MSDN