[C++-sig] Creating an array in C++

[CÔTÉ Marc-Alexis]

Hello,

I am relatively new to the world of python, so please bear with me if you
find this question rather basic.

I am writting some python code that interfaces with an image processing
library that I wrote in C++. Up until now, I have exchanged image data
(between the c++ library and python) through bitmaps stored in files. I find
this rather clumsy and I am trying to use boost.python and the
numeric::array type to help me transfer images from the library in a more
elegant manner.

My first problem is in creating the numeric::array in the c++ code. Let's
say that I want a 3 dimensional array of unsigned bytes, would this be a
correct way to do it?

unsigned char data[300];
boost::python::numeric::array anArray(&data[0], "UByte",
boost::python::make_tuple(10,10,3));

This doesn't give an error when I compile it. However, it fails to run as I
expect it:

>>>TypeError: No to_python (by-value) converter found for C++ type: unsigned
char

What am I missing?
Would you even use an array to return the data, or is there a better way?

Thanks,

Marc-Alexis Cote
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