PHP to C++ Communication

This is a discussion on PHP to C++ Communication within the C++ Programming forums, part of the General Programming Boards category; Hey guys, I've got a small PHP script which opens a socket to my server (C++ program). What would be ...

  1. #1
    Dae
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    Smile PHP to C++ Communication

    Hey guys, I've got a small PHP script which opens a socket to my server (C++ program). What would be the best way to communication between PHP/C++ sockets? JSON? XML? boost::serialize? An API for PHP with an equivalent parsing library for C++? custom?

    At the moment I'm just sending a message code (say 100, 101) then a string (say "hello") and using: (eg. "101hello")

    Code:
    class Message
    {
    	public: unsigned int ID;
    	public: std::string Data;
    };
    
    
    //inside server class
    private: boost::asio::streambuf data;
    
    
    //inside server class read function
    std::istream data_stream(&this->data);
    
    Message* message = new Message;
    
    data_stream >> message->ID;
    data_stream >> message->Data;
    However if the data string starts with a digit, the stream sends them to the ID variable instead of Data. If there's a fix for that problem (some kind of separator? such as "101-hello-500-zzz" would be 101, "hello", 500, "zzz") then I could survive using this method. I could quickfix that, but I would like other ideas.

    Otherwise can anyone recommend a C or C++ XML library or otherwise?

    Thanks in advance
    Last edited by Dae; 07-27-2009 at 12:09 AM.
    Warning: Have doubt in anything I post.

    GCC 4.5, Boost 1.40, Code::Blocks 8.02, Ubuntu 9.10 010001000110000101100101

  2. #2
    Cat without Hat CornedBee's Avatar
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    I would say JSON. It's simple to parse and use. You can't use Boost.Serialization for inter-language transfer; it's too bound to C++. (Someone recently tried - there was a long thread on the Boost mailing list.) XML is, in my opinion, overkill for most things.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
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  3. #3
    & the hat of GPL slaying Thantos's Avatar
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    What is the data? How is it represented (Plain text with spaces, without spaces, etc)? Is there a need to use a generic communication protocol?

    For example if each message ends with a particular character then you could use getline with that character as the terminator.

  4. #4
    Dae
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    Thanks for the info. I tried JSON and normally I have no problems, but it seems PHP's json_decode(), as well as jQuery's getJSON(), as well as JavaScript's eval() functions fail to decode the "data" tag (shown in the xml below). Apparently the forward slashes (/) have to be escaped (\/) and even after doing so I had no luck. It was weird because if I manually copy and paste the JSON into the script, it works fine, but as a string variable, it fails. Whatever. I decided to try boost::serialize with boost XML archive. XML works fine (even before using boost). It works well except for the bloating, and you must declare all tags and sometimes values, or else it throws exceptions (stream/undefined/etc).

    Here's how it's represented via boost::serialize:

    Code:
    <?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
    <!DOCTYPE boost_serialization>
    <boost_serialization signature="serialization::archive" version="5">
    <image class_id="0" tracking_level="0" version="0">
            <id>5</id>
            <format>image/gif</format>
            <command>get</command>
            <data>/9j/4AAQSkZJRgABAQAAAQABAAD//gATYjQ0OGUyYjgwNzg3ZWE2MwD/2wBDAAgG
    BgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAx
    NDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIyMjIyMjIyMjIy
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    </data>
    </image>
    </boost_serialization>
    id/format/command/data are the important variables. Command variable tells C++ what PHP wants. C++ fills in data variable, sends it to PHP, PHP sends it to page via AJAX, AJAX changes the data variable and sends it back to PHP via AJAX, and PHP sends it back to C++ for finalization. Sometimes certain tags aren't necessarily used, but boost requires they be defined, so I just null them out before sending back and forth then resync afterwards.

    That's just the basic idea. I may expand on it tomorrow. G'night.
    Last edited by Dae; 07-27-2009 at 09:51 AM.
    Warning: Have doubt in anything I post.

    GCC 4.5, Boost 1.40, Code::Blocks 8.02, Ubuntu 9.10 010001000110000101100101

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