From: Su Zhang <zhangsu@...>
Date: 2011-05-18T05:00:51+09:00
Subject: Re: Sharing data between ruby and a custom dll with Win32API

Hi Futar,

I suppose you are using 'p' as the return type specifier of Win32API; 
this is interpreted as a pointer to a null-terminated string.Therefore, 
any null byte in your array of floats will mark the end of the "string" 
buffer.

In this case, I think you can simply reference the same buffer you pass 
to @getkaplamatrix.

matrix2 = matrix.pack("f*")
@getKaplaMatrix.call(index, matrix2)
matrix3 = matrix2.unpack("f*")

And if you really do need to return a reference to something, you will 
often have to return it as an integer address and manipulate (reference 
and dereference) it through native interfaces such as RtlMoveMemory.

Su

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