passing byte array from c++ to python

Question

As the title suggests, I'd like to pass a byte array from c++ to python. I understand I would need to convert my byte array into a PyObject somehow but this is where I got stuck. Is there anyone who can help me out with this.

Thanks in advance,

freakish · Accepted Answer · 2017-07-14 13:46:27Z

3

PyBytes_FromString to the rescue assuming Python3+:

https://docs.python.org/3/c-api/bytes.html

Under Python2.x PyString_FromString:

https://docs.python.org/2/c-api/string.html

answered Jul 14, 2017 at 13:46

freakish

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3 Comments

las Over a year ago

I'm using an opencv matrix to byte conversion like this <br/>std::memcpy(bytes,image.data,size * sizeof(byte)); so this is not a string. How do I use it with PyBytes_FromString?

freakish Over a year ago

@las *_FromString functions take const char* as arg. You say that you have a byte array. So I assume that's exactly what it is. It's a bit confusing but strings and byte arrays meant the same thing back in days. If you allow nulls in your sequence of bytes then *_FromStringAndSize might be a better choice.

freakish Over a year ago

Anyway I don't know opencv but if you have anything else then first you have to find a way to convert it to char*.

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