(Xojo Plugin) 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 Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim http As New Chilkat.Http

http.AuthToken = "ACCESS_TOKEN"

http.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.
Dim jsonMsgIds As New Chilkat.JsonObject
Dim success As Boolean
success = jsonMsgIds.LoadFile("qa_data/json/gmail_message_ids.json")

Dim id As String
Dim i As Int32
i = 0
Dim count_i As Int32
count_i = jsonMsgIds.SizeOfArray("messages")
While i < count_i
    jsonMsgIds.I = i
    id = jsonMsgIds.StringOf("messages[i].id")

    // Get the metadata for this message ID.
    success = http.SetUrlVar("id",id)

    Dim resp As Chilkat.HttpResponse
    resp = http.QuickRequest("GET","https://www.googleapis.com/gmail/v1/users/userId/messages/{$id}?format=metadata")
    If (http.LastMethodSuccess <> True) Then
        System.DebugLog(http.LastErrorText)
        Return
    End If

    System.DebugLog("Response Status Code: " + Str(resp.StatusCode))

    Dim jsonResponse As New Chilkat.JsonObject
    success = jsonResponse.Load(resp.BodyStr)
    jsonResponse.EmitCompact = False
    System.DebugLog(jsonResponse.Emit())

    If (resp.StatusCode <> 200) Then
        System.DebugLog("Failed.")

        Return
    End If

    i = i + 1
Wend

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