Visual FoxPro 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

LOCAL loRest
LOCAL lnSuccess
LOCAL loOauth2
LOCAL loSbJson
LOCAL loJson
LOCAL lcId
LOCAL lcThreadId
LOCAL lcSnippet
LOCAL lcHistoryId
LOCAL lcInternalDate
LOCAL lcPayloadMimeType
LOCAL lnSizeEstimate
LOCAL i
LOCAL lnCount_i
LOCAL lcStrVal
LOCAL lcName
LOCAL lcValue

loRest = CreateObject('Chilkat_9_5_0.Rest')

*   Provide a previously obtained OAuth2 access token.
loOauth2 = CreateObject('Chilkat_9_5_0.OAuth2')
loOauth2.AccessToken = "OAUTH2_ACCESS_TOKEN"
loRest.SetAuthOAuth2(loOauth2)

lnSuccess = loRest.Connect("www.googleapis.com",443,1,1)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loOauth2
    CANCEL
ENDIF

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

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

loSbJson = CreateObject('Chilkat_9_5_0.StringBuilder')
lnSuccess = loRest.FullRequestNoBodySb("GET","/gmail/v1/users/me/messages/messageId",loSbJson)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loOauth2
    RELEASE loSbJson
    CANCEL
ENDIF

IF (loRest.ResponseStatusCode <> 200) THEN
    ? "Received error response code: " + STR(loRest.ResponseStatusCode)
    ? "Response body:"
    ? loSbJson.GetAsString()
    RELEASE loRest
    RELEASE loOauth2
    RELEASE loSbJson
    CANCEL
ENDIF

loJson = CreateObject('Chilkat_9_5_0.JsonObject')
loJson.LoadSb(loSbJson)

*  The following code parses the JSON response.
*  A sample JSON response is shown below the sample code.

lcId = loJson.StringOf("id")
lcThreadId = loJson.StringOf("threadId")
lcSnippet = loJson.StringOf("snippet")
lcHistoryId = loJson.StringOf("historyId")
lcInternalDate = loJson.StringOf("internalDate")
lcPayloadMimeType = loJson.StringOf("payload.mimeType")
lnSizeEstimate = loJson.IntOf("sizeEstimate")
i = 0
lnCount_i = loJson.SizeOfArray("labelIds")
DO WHILE i < lnCount_i
    loJson.I = i
    lcStrVal = loJson.StringOf("labelIds[i]")
    i = i + 1
ENDDO
i = 0
lnCount_i = loJson.SizeOfArray("payload.headers")
DO WHILE i < lnCount_i
    loJson.I = i
    lcName = loJson.StringOf("payload.headers[i].name")
    lcValue = loJson.StringOf("payload.headers[i].value")
    i = i + 1
ENDDO

? "Example Completed."

RELEASE loRest
RELEASE loOauth2
RELEASE loSbJson
RELEASE loJson

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
}