Using c++ solution in rails app

Question

I have a C++ project using OpenCV for some operations with images (visual studio 2010; opencv2.4.9). I need make rails app with functions of my project on C++. Moreover I need give some parameters from rails app to C project and take result to rails app. How can i do it? P.s.: OpenCV for ruby not suitable for me.

http://chris911.github.io/blog/2014/08/10/writing-a-ruby-gem-with-c-extension/ — max, Oct 24 '15 at 11:16

score 0 · Answer 1 · edited May 23 '17 at 12:03

0

You could use backticks, or %x() to execute your C++ program. It's just like you would execute it from a terminal, i.e. %x(/path/to/your/C++/executable parameter1 parameter2)

For more information on this, see this question.

edited May 23 '17 at 12:03

Community

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answered Oct 24 '15 at 11:34

tschale

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"Cannot execute binary file" – user5092650 Oct 31 '15 at 15:15
Is this the only error output? Can you give more information? – tschale Nov 01 '15 at 17:12

score 0 · Answer 2 · answered Oct 25 '15 at 19:29

@tschale already mentioned a solution. Here is a more elaborate solution that you would use if your code is expected to be put on the internet or internal network anytime soon.

Get a message queue - redis, beanstalkd, rabbitmq. This is a third executable that you need to run on your web host. This executable provides REST APIs for updating the queue.

If your rails app wants to do a task, it would push a message onto this queue. The message would look something like this:

{
    "task": "run_facedetect",
    "param1": "something",
    "param2": {
        "detail1": 45
        ...
    }
}

(I'm using JSON only as an example. You're free to use any encoding you want).

The rails app only has to push to queue and it is done.

Now your C/C++ application is listening to the queue (using the REST api). As soon as it sees a message, it spawns a facedetect app with the given parameters. Once done, the results are stored in a place where you rails app can read it.

Using c++ solution in rails app

2 Answers2