Visual FoxPro

Get GMail Message Metadata

See more GMail REST API Examples

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

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

lnSuccess = 0

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

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.
loJsonMsgIds = CreateObject('Chilkat.JsonObject')
lnSuccess = loJsonMsgIds.LoadFile("qa_data/json/gmail_message_ids.json")

loResp = CreateObject('Chilkat.HttpResponse')

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)

    lnSuccess = loHttp.HttpNoBody("GET","https://www.googleapis.com/gmail/v1/users/userId/messages/{$id}?format=metadata",loResp)
    IF (lnSuccess = 0) THEN
        ? loHttp.LastErrorText
        RELEASE loHttp
        RELEASE loJsonMsgIds
        RELEASE loResp
        CANCEL
    ENDIF

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

    loJsonResponse = CreateObject('Chilkat.JsonObject')
    loJsonResponse.Load(loResp.BodyStr)
    loJsonResponse.EmitCompact = 0
    ? loJsonResponse.Emit()

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

    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 loResp
RELEASE loJsonResponse