(Visual FoxPro) Get GMail Message Metadata

Demonstrates how to get the metadata for each message in a list of message IDs.

For more information, see https://developers.google.com/gmail/api/v1/reference/users/messages/get

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loHttp
LOCAL loJsonMsgIds
LOCAL lnSuccess
LOCAL lcId
LOCAL i
LOCAL lnCount_i
LOCAL loResp
LOCAL loJsonResponse

* This example requires the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http')
loHttp = CreateObject('Chilkat.Http')

loHttp.AuthToken = "ACCESS_TOKEN"

loHttp.Accept = "application/json"

* Let's say we have the following JSON containing a list of message ID's

* {
*   "messages": [
*     {
*       "id": "1712bc1dc22da2a2",
*       "threadId": "1712bc1dc22da2a2"
*     },
*     {
*       "id": "1712b94fa2168040",
*       "threadId": "1712b94fa2168040"
*     },
*     {
*       "id": "1711e4bd96ded05e",
*       "threadId": "1711e4bd96ded05e"
*     },
*     {
*       "id": "1711de0d119e751e",
*       "threadId": "1711de0d119e751e"
*     },
*     {
*       "id": "1711c81a43050f59",
*       "threadId": "1711c81a43050f59"
*     },
*     {
*       "id": "1711c2c1516abce5",
*       "threadId": "1711c2c1516abce5"
*     },
*     {
*       "id": "1711c161e655c915",
*       "threadId": "1711c161e655c915"
*     },
*     {
*       "id": "171199c6e454558c",
*       "threadId": "171199c6e454558c"
*     },
*     {
*       "id": "17119474c8aa248e",
*       "threadId": "17119474c8aa248e"
*     }
*   ],
*   "nextPageToken": "16710921492249671162",
*   "resultSizeEstimate": 309
* }

* Normally your program would have the above JSON in a string variable (obtained from a previous call to get
* a list of message IDs from a GMail mailbox).  In this example, we'll load the JSON from a file.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonMsgIds = CreateObject('Chilkat.JsonObject')
lnSuccess = loJsonMsgIds.LoadFile("qa_data/json/gmail_message_ids.json")

i = 0
lnCount_i = loJsonMsgIds.SizeOfArray("messages")
DO WHILE i < lnCount_i
    loJsonMsgIds.I = i
    lcId = loJsonMsgIds.StringOf("messages[i].id")

    * Get the metadata for this message ID.
    loHttp.SetUrlVar("id",lcId)

    loResp = loHttp.QuickRequest("GET","https://www.googleapis.com/gmail/v1/users/userId/messages/{$id}?format=metadata")
    IF (loHttp.LastMethodSuccess <> 1) THEN
        ? loHttp.LastErrorText
        RELEASE loHttp
        RELEASE loJsonMsgIds
        CANCEL
    ENDIF

    ? "Response Status Code: " + STR(loResp.StatusCode)

    * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
    loJsonResponse = CreateObject('Chilkat.JsonObject')
    loJsonResponse.Load(loResp.BodyStr)
    loJsonResponse.EmitCompact = 0
    ? loJsonResponse.Emit()

    IF (loResp.StatusCode <> 200) THEN
        ? "Failed."
        RELEASE loResp
        RELEASE loHttp
        RELEASE loJsonMsgIds
        RELEASE loJsonResponse
        CANCEL
    ENDIF

    RELEASE loResp

    i = i + 1
ENDDO

* Use this online tool to generate parsing code from sample JSON: 
* Generate Parsing Code from JSON

RELEASE loHttp
RELEASE loJsonMsgIds
RELEASE loJsonResponse