C# UWP/WinRT 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

Chilkat.Rest rest = new Chilkat.Rest();
bool success;

//   Provide a previously obtained OAuth2 access token.
Chilkat.OAuth2 oauth2 = new Chilkat.OAuth2();
oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN";
rest.SetAuthOAuth2(oauth2);

success = await rest.ConnectAsync("www.googleapis.com",443,true,true);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

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

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

Chilkat.StringBuilder sbJson = new Chilkat.StringBuilder();
success = await rest.FullRequestNoBodySbAsync("GET","/gmail/v1/users/me/messages/messageId",sbJson);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

if (rest.ResponseStatusCode != 200) {
    Debug.WriteLine("Received error response code: " + Convert.ToString(rest.ResponseStatusCode));
    Debug.WriteLine("Response body:");
    Debug.WriteLine(sbJson.GetAsString());
    return;
}

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.LoadSb(sbJson);

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

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.I = i;
    strVal = json.StringOf("labelIds[i]");
    i = i + 1;
}

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

Debug.WriteLine("Example Completed.");

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
}