Visual Basic 6.0 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 ChilkatRest
Dim success As Long

'   Provide a previously obtained OAuth2 access token.
Dim oauth2 As New ChilkatOAuth2
oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN"
success = rest.SetAuthOAuth2(oauth2)

success = rest.Connect("www.googleapis.com",443,1,1)
If (success <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

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

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

Dim sbJson As New ChilkatStringBuilder
success = rest.FullRequestNoBodySb("GET","/gmail/v1/users/me/messages/messageId",sbJson)
If (success <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

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

Dim json As New ChilkatJsonObject
success = 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 Long
Dim i As Long
Dim count_i As Long
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")
Do While i < count_i
    json.I = i
    strVal = json.StringOf("labelIds[i]")
    i = i + 1
Loop
i = 0
count_i = json.SizeOfArray("payload.headers")
Do While i < count_i
    json.I = i
    name = json.StringOf("payload.headers[i].name")
    value = json.StringOf("payload.headers[i].value")
    i = i + 1
Loop

Debug.Print "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
}