Send Receive using casablanca c++ rest sdk - c++

Question

I'm just starting with RESTful programming and trying to make a program in c++ using the Casablanca sdk (https://github.com/Microsoft/cpprestsdk). I know that I need to use GET, POST, PUT and DEL methods to do data transfer etc. But I cant seem to find any examples on how to do this. I currently need to send an integer value to the server from the client and get a Boolean response from the server. I cant find any good examples in Casablanca's documentation or the web. Any help regarding how to do this simple transfer would be appreciated.

Answer 1

Spending more time to explore the documentation and various examples on the internet would probably have got you the answer.
Basically, you have to set up a http listener, as the server, that will listen to client request at a particular url.
Then a client can send data on that url, to communicate with it.
Nevertheless, if you want to exchange data in json format,
Server would look something like this
void handle_post(http_request request)
{
json::value temp;
request.extract_json() //extracts the request content into a json
.then([&temp](pplx::task<json::value> task)
{
temp = task.get();
})
.wait();
//do whatever you want with 'temp' here
request.reply(status_codes::OK, temp); //send the reply as a json.
}
int main()
{
http_listener listener(L"http://localhost/restdemo"); //define a listener on this url.
listener.support(methods::POST, handle_post); //'handle_post' is the function this listener will go to when it receives a POST request.
try
{
listener
.open() //start listening
.then([&listener](){TRACE(L"\nstarting to listen\n");})
.wait();
while (true);
}
catch (exception const & e)
{
wcout << e.what() << endl;
}
}
Client would be,
int main()
{
json::value client_temp;
http_client client(L"http://localhost");
//insert data into the json e.g : json::value(54)
client.request(methods::POST, L"/restdemo", object)
.then([](http_response response)
{
if (response.status_code() == status_codes::OK)
{
return response.extract_json();
}
return pplx::task_from_result(json::value());
})
.then([&client_temp ](pplx::task<json::value> previousTask)
{
client_temp = previousTask.get();
})
.wait();
}
Your server reply will be stored into 'client_temp'