I have a sensor value which can be read using the C++ only because it was implemented using it , I want to pass location value (two float variable) of one sensor to Python. I have been reading a lot and I found shared memory , piping and more any idea what is the best way to do it ?
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What device are you working with? Maybe there's a python lib somewhere that will do the task just like the C++ one does?Jezor– Jezor2016-08-14 16:31:01 +00:00Commented Aug 14, 2016 at 16:31
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3 Answers
It's not clear from your question whether this is a standalone C++ program or a library.
If it's a standalone program, use the subprocess module to invoke it and read its output.
If it's a library, use Cython to construct a Python extension module that wraps the library. (It is not necessary to use Cython; Python extensions can be written by hand. But it will make the task significantly easier.)
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@ramtha Z28 with the limited information you provided... do you have access to the C++ code itself or are you calling a DLL? You can wrap a function in Cython easily to communicate between Python and C++ if you have the source code. Wrap all the C++ blocks in cpdef statements which are accessible from Python and C++. Example files are here which show you how to include a C program in Cython and interact with Python: https://github.com/cythonbook/examples/tree/master/07-wrapping-c/01-wrapping-c-functions-mt-random
If it is a DLL you have to declare all the constants, functions, return values. Actually this example may be something like what you're using already: http://people.seas.harvard.edu/~krussell/html-tutorial/wrap_dll.html
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I'm not familiar with python however, a simple approach is to use some communication protocols such as serial ports or udp which is a network protocol. For real-time applications, UDP protocol is a preferable choice.
