VB.NET 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

Dim rest As New Chilkat.Rest
Dim success As Boolean

'   Provide a previously obtained OAuth2 access token.
Dim oauth2 As New Chilkat.OAuth2
oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN"
rest.SetAuthOAuth2(oauth2)

success = Await rest.ConnectAsync("www.googleapis.com",443,True,True)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


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

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

Dim sbJson As New Chilkat.StringBuilder
success = Await rest.FullRequestNoBodySbAsync("GET","/gmail/v1/users/me/messages/messageId",sbJson)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


If (rest.ResponseStatusCode <> 200) Then
    Debug.WriteLine("Received error response code: " & rest.ResponseStatusCode)
    Debug.WriteLine("Response body:")
    Debug.WriteLine(sbJson.GetAsString())
    Exit Sub
End If


Dim json As New Chilkat.JsonObject
json.LoadSb(sbJson)

'  The following code parses the JSON response.
'  A sample JSON response is shown below the sample code.
Dim id As String
Dim threadId As String
Dim snippet As String
Dim historyId As String
Dim internalDate As String
Dim payloadMimeType As String
Dim sizeEstimate As Integer
Dim i As Integer
Dim count_i As Integer
Dim strVal As String
Dim name As String
Dim value As String

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
End While
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
End While



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
}