Pass simple numpy array to C via SWIG

Question

I want to pass numpy array of known size and type via SWIG to C function

# .py
data = numpy.arange( N , dtype=numpy.int32 )
external_c_function( data )

# .i
extern void external_c_function( int32_t* data );

# .c
void external_c_function( int32_t* data)
{
    // ...
}

Unfortunately, I will get an error:

TypeError: in method 'external_c_function', argument 1 of type 'int32_t *'

What is the easiest way to pass numpy array to SWIG?

Pim Schellart · Accepted Answer · 2012-01-12 09:40:25Z

2

You can use numpy.i. Just have a look at http://www.scipy.org/Cookbook/SWIG_NumPy_examples

answered Jan 12, 2012 at 9:40

Pim Schellart

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1 Comment

user29650973 Jul 5 at 16:55

Updated link: scipy-cookbook.readthedocs.io/items/SWIG_NumPy_examples.html

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