C++ GMail: Get a specific message (format="metadata")

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Gets a specific message using format=metadata.

Documentation: https://developers.google.com/gmail/api/v1/reference/users/messages/get

#include <CkRest.h>
#include <CkOAuth2.h>
#include <CkStringBuilder.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkRest rest;
    bool success;

    //   Provide a previously obtained OAuth2 access token.
    CkOAuth2 oauth2;
    oauth2.put_AccessToken("OAUTH2_ACCESS_TOKEN");
    rest.SetAuthOAuth2(oauth2);

    success = rest.Connect("www.googleapis.com",443,true,true);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    rest.AddPathParam("messageId","15fc23688c553739");

    rest.AddQueryParam("format","metadata");

    CkStringBuilder sbJson;
    success = rest.FullRequestNoBodySb("GET","/gmail/v1/users/me/messages/messageId",sbJson);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    if (rest.get_ResponseStatusCode() != 200) {
        std::cout << "Received error response code: " << rest.get_ResponseStatusCode() << "\r\n";
        std::cout << "Response body:" << "\r\n";
        std::cout << sbJson.getAsString() << "\r\n";
        return;
    }

    CkJsonObject json;
    json.LoadSb(sbJson);

    //  The following code parses the JSON response.
    //  A sample JSON response is shown below the sample code.
    const char *id = 0;
    const char *threadId = 0;
    const char *snippet = 0;
    const char *historyId = 0;
    const char *internalDate = 0;
    const char *payloadMimeType = 0;
    int sizeEstimate;
    int i;
    int count_i;
    const char *strVal = 0;
    const char *name = 0;
    const char *value = 0;

    id = json.stringOf("id");
    threadId = json.stringOf("threadId");
    snippet = json.stringOf("snippet");
    historyId = json.stringOf("historyId");
    internalDate = json.stringOf("internalDate");
    payloadMimeType = json.stringOf("payload.mimeType");
    sizeEstimate = json.IntOf("sizeEstimate");
    i = 0;
    count_i = json.SizeOfArray("labelIds");
    while (i < count_i) {
        json.put_I(i);
        strVal = json.stringOf("labelIds[i]");
        i = i + 1;
    }

    i = 0;
    count_i = json.SizeOfArray("payload.headers");
    while (i < count_i) {
        json.put_I(i);
        name = json.stringOf("payload.headers[i].name");
        value = json.stringOf("payload.headers[i].value");
        i = i + 1;
    }

    std::cout << "Example Completed." << "\r\n";
    }

Sample JSON Response Body

{
  "id": "15fc23688c553739",
  "threadId": "15fc23688c553739",
  "labelIds": [
    "IMPORTANT",
    "SENT",
    "INBOX"
  ],
  "snippet": "This is a test. \u200b",
  "historyId": "1438",
  "internalDate": "1510791874000",
  "payload": {
    "mimeType": "multipart/mixed",
    "headers": [
      {
        "name": "MIME-Version",
        "value": "1.0"
      },
      {
        "name": "Received",
        "value": "by 10.25.23.105 with HTTP; Wed, 15 Nov 2017 16:24:34 -0800 (PST)"
      },
      {
        "name": "X-Originating-IP",
        "value": "[2601:249:e00:9093:e894:b27f:e5d6:d01d]"
      },
      {
        "name": "Date",
        "value": "Wed, 15 Nov 2017 18:24:34 -0600"
      },
      {
        "name": "Delivered-To",
        "value": "matt@chilkat.io"
      },
      {
        "name": "Message-ID",
        "value": "\u003cCAPhjyBM1qqXS6NVB65W8Zt5-McF03qWSRDjW5am66wTMuard=w@mail.gmail.com\u003e"
      },
      {
        "name": "Subject",
        "value": "Test HTML email with image and attachment."
      },
      {
        "name": "From",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "To",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "Content-Type",
        "value": "multipart/mixed; boundary=\"001a11401a6c097887055e0ea572\""
      }
    ]
  },
  "sizeEstimate": 11716
}