(Lianja) 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

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

loHttp = createobject("CkHttp")

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("CkJsonObject")
llSuccess = 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 <> .T.) then
        ? loHttp.LastErrorText
        release loHttp
        release loJsonMsgIds
        return
    endif

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

    loJsonResponse = createobject("CkJsonObject")
    loJsonResponse.Load(loResp.BodyStr)
    loJsonResponse.EmitCompact = .F.
    ? loJsonResponse.Emit()

    if (loResp.StatusCode <> 200) then
        ? "Failed."
        release loResp
        release loHttp
        release loJsonMsgIds
        release loJsonResponse
        return
    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