(C++) Google Maps Geolocation Request

Demonstrates how make a Google Maps Geolocation REST API request.

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#include <CkRest.h>
#include <CkJsonObject.h>
#include <CkJsonArray.h>

void ChilkatSample(void)
    {
    // This example duplicates the following CURL request:
    // curl -d @your_filename.json -H "Content-Type: application/json" -i "https://www.googleapis.com/geolocation/v1/geolocate?key=YOUR_API_KEY"

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

    CkRest rest;

    // Connect to the Google API REST server.
    bool bTls = true;
    int port = 443;
    bool bAutoReconnect = true;
    bool success = rest.Connect("www.googleapis.com",port,bTls,bAutoReconnect);

    // Add the Content-Type request header.
    rest.AddHeader("Content-Type","application/json");

    // Add your API key as a query parameter
    rest.AddQueryParam("key","YOUR_API_KEY");

    // The JSON query is contained in the body of the HTTP POST.
    // This is a sample query (which we'll dynamically build in this example)
    // { 
    //  "homeMobileCountryCode": 310,
    //  "homeMobileNetworkCode": 260,
    //  "radioType": "gsm",
    //  "carrier": "T-Mobile",
    //  "cellTowers": [
    //   {
    //    "cellId": 39627456,
    //    "locationAreaCode": 40495,
    //    "mobileCountryCode": 310,
    //    "mobileNetworkCode": 260,
    //    "age": 0,
    //    "signalStrength": -95
    //   }
    //  ],
    //  "wifiAccessPoints": [
    //   { 
    //    "macAddress": "01:23:45:67:89:AB",
    //    "signalStrength": 8,
    //    "age": 0,
    //    "signalToNoiseRatio": -65,
    //    "channel": 8
    //   },
    //   { 
    //    "macAddress": "01:23:45:67:89:AC",
    //    "signalStrength": 4,
    //    "age": 0
    //   }
    //  ]
    // }

    CkJsonObject json;
    json.AppendInt("homeMobileCountryCode",310);
    json.AppendInt("homeMobileNetworkCode",260);
    json.AppendString("radioType","gsm");
    json.AppendString("carrier","T-Mobile");
    CkJsonArray *aCellTowers = json.AppendArray("cellTowers");
    aCellTowers->AddObjectAt(0);
    CkJsonObject *oCellTower = aCellTowers->ObjectAt(0);
    oCellTower->AppendInt("cellId",39627456);
    oCellTower->AppendInt("locationAreaCode",40495);
    oCellTower->AppendInt("mobileCountryCode",310);
    oCellTower->AppendInt("mobileNetworkCode",260);
    oCellTower->AppendInt("age",0);
    oCellTower->AppendInt("signalStrength",-95);
    delete oCellTower;
    delete aCellTowers;
    CkJsonArray *aWifi = json.AppendArray("wifiAccessPoints");
    aWifi->AddObjectAt(0);
    CkJsonObject *oPoint = aWifi->ObjectAt(0);
    oPoint->AppendString("macAddress","01:23:45:67:89:AB");
    oPoint->AppendInt("signalStrength",8);
    oPoint->AppendInt("age",0);
    oPoint->AppendInt("signalToNoiseRatio",-65);
    oPoint->AppendInt("channel",8);
    delete oPoint;
    aWifi->AddObjectAt(1);
    oPoint = aWifi->ObjectAt(1);
    oPoint->AppendString("macAddress","01:23:45:67:89:AC");
    oPoint->AppendInt("signalStrength",4);
    oPoint->AppendInt("age",0);
    delete oPoint;
    delete aWifi;

    const char *responseJson = rest.fullRequestString("POST","/geolocation/v1/geolocate",json.emit());
    if (rest.get_LastMethodSuccess() != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // When successful, the response code is 200.
    if (rest.get_ResponseStatusCode() != 200) {
        // Examine the request/response to see what happened.
        std::cout << "response status code = " << rest.get_ResponseStatusCode() << "\r\n";
        std::cout << "response status text = " << rest.responseStatusText() << "\r\n";
        std::cout << "response header: " << rest.responseHeader() << "\r\n";
        std::cout << "response JSON: " << responseJson << "\r\n";
        std::cout << "---" << "\r\n";
        std::cout << "LastRequestStartLine: " << rest.lastRequestStartLine() << "\r\n";
        std::cout << "LastRequestHeader: " << rest.lastRequestHeader() << "\r\n";
        return;
    }

    json.put_EmitCompact(false);
    std::cout << "JSON request body: " << json.emit() << "\r\n";

    // The JSON response should look like this:
    // { 
    //  "location": {
    //   "lat": 37.4248297,
    //   "lng": -122.07346549999998
    //  },
    //  "accuracy": 1145.0
    // }

    std::cout << "JSON response: " << responseJson << "\r\n";

    CkJsonObject jsonResp;
    jsonResp.Load(responseJson);

    CkJsonObject *jsonLoc = jsonResp.ObjectOf("location");
    // Any JSON value can be obtained as a string..
    const char *latitude = jsonLoc->stringOf("lat");
    std::cout << "latitude = " << latitude << "\r\n";
    const char *longitude = jsonLoc->stringOf("lng");
    std::cout << "longitude = " << longitude << "\r\n";
    delete jsonLoc;

    const char *accuracy = jsonResp.stringOf("accuracy");
    std::cout << "accuracy = " << accuracy << "\r\n";
    }