CODEWITHSUNDEEP
c++jsonhttpcgi
Tampa
Tampa

Reputation: 78234

How to get json payload for a C++ json post

I need to create a c++ cgi app the accepts post data. I will be accepting a json object. How to I get the payload?

I can get the get data using the below

int main() {
    bool DEBUG = true;

    cout << "content-type: text/html" << endl << endl;

    //WHAT GOES HERE FOR POST
    json=?????

    //THIS IS A GET
    query_string = getenv("QUERY_STRING");

}

Upvotes: 0

Views: 2470

Answers (2)

Loki Astari
Loki Astari

Reputation: 264331

Assuming apache:

The documentation is found here:

You will find it near the bottom but the post data is provided over stdin.

#include <iostream>
#include <string>
#include <sstream>

int main() 
{   
    bool DEBUG = true;

    std::cout << "content-type: text/html\n\n"; // prefer \n\n to std::endl
                                                // you probably don't want to flush immediately.

    std::stringstream post;
    post << std::cin.rdbuf();

    std::cout << "Got: " << post.str() << "\n";
}

Upvotes: 2

rmhartog
rmhartog

Reputation: 2323

If the method type is POST (you may also want to check this) then the POST-data is written to stdin. You can therefore use standard methods like this:

// Do not skip whitespace, more configuration may also be needed.
cin >> noskipws;

// Copy all data from cin, using iterators.
istream_iterator<char> begin(cin);
istream_iterator<char> end;
string json(begin, end);

// Use the JSON data somehow.
cout << "JSON was " << json << endl;

This will read all data from cin into json until an EOF occurs.

Upvotes: 2

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