(C++) Firebase PATCH - Updating Data

Uses the PATCH method to update record with new information. The data used in this example is at Chilkat Firebase Pigs Database, and is shown here:

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#include <CkFileAccess.h>
#include <CkRest.h>
#include <CkAuthGoogle.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    // Uses the PATCH method to update a Firebase record.

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // This example assumes a JWT authentication token, if required, has been previously obtained.
    // See Get Firebase Access Token from JSON Service Account Private Key for sample code.

    // Load the previously obtained Firebase access token into a string.
    CkFileAccess fac;
    const char *accessToken = fac.readEntireTextFile("qa_data/tokens/firebaseToken.txt","utf-8");
    if (fac.get_LastMethodSuccess() != true) {
        std::cout << fac.lastErrorText() << "\r\n";
        return;
    }

    CkRest rest;

    // Make the initial connection (without sending a request yet).
    // Once connected, any number of requests may be sent.  It is not necessary to explicitly
    // call Connect before each request.  
    bool success = rest.Connect("chilkat.firebaseio.com",443,true,true);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    CkAuthGoogle authGoogle;
    authGoogle.put_AccessToken(accessToken);
    rest.SetAuthGoogle(authGoogle);

    // Chilkat's sample data (pig-rescue data) is publicly readable at: https://chilkat.firebaseio.com/.json
    // This data is publicly readable, but not writable.  You'll need to 
    // run against your own database..

    // We're going to update "Molly II" to "Molly III"
    CkJsonObject pigNameUpdate;
    pigNameUpdate.AppendString("name","Molly III");

    // The string content of the last arg passed is  {"name":"Molly III"} 
    const char *jsonResponse = rest.fullRequestString("PATCH","/pig-rescue/animal/-KI3bD-FU_Dake7sYOiP.json",pigNameUpdate.emit());
    if (rest.get_LastMethodSuccess() != true) {
        // Something happened in the communications (either no request was sent, or no response was received.
        // (The Chilkat REST API also has lower-level methods where an app can send the request in one call,
        // and then receive the response in another call.)
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // Check the response status code.   A 200 response status indicates success.
    if (rest.get_ResponseStatusCode() != 200) {
        std::cout << rest.responseStatusText() << "\r\n";
        std::cout << jsonResponse << "\r\n";
        std::cout << "Failed." << "\r\n";
        return;
    }

    // When successful, the response contains the data written.
    std::cout << jsonResponse << "\r\n";
    std::cout << "Success." << "\r\n";
    }