PowerBuilder

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. PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Http
oleobject loo_JsonMsgIds
oleobject loo_Resp
string ls_Id
integer i
integer li_Count_i
oleobject loo_JsonResponse

li_Success = 0

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

loo_Http = create oleobject
li_rc = loo_Http.ConnectToNewObject("Chilkat.Http")
if li_rc < 0 then
    destroy loo_Http
    MessageBox("Error","Connecting to COM object failed")
    return
end if

loo_Http.AuthToken = "ACCESS_TOKEN"

loo_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.
loo_JsonMsgIds = create oleobject
li_rc = loo_JsonMsgIds.ConnectToNewObject("Chilkat.JsonObject")

li_Success = loo_JsonMsgIds.LoadFile("qa_data/json/gmail_message_ids.json")

loo_Resp = create oleobject
li_rc = loo_Resp.ConnectToNewObject("Chilkat.HttpResponse")

i = 0
li_Count_i = loo_JsonMsgIds.SizeOfArray("messages")
do while i < li_Count_i
    loo_JsonMsgIds.I = i
    ls_Id = loo_JsonMsgIds.StringOf("messages[i].id")

    // Get the metadata for this message ID.
    loo_Http.SetUrlVar("id",ls_Id)

    li_Success = loo_Http.HttpNoBody("GET","https://www.googleapis.com/gmail/v1/users/userId/messages/{$id}?format=metadata",loo_Resp)
    if li_Success = 0 then
        Write-Debug loo_Http.LastErrorText
        destroy loo_Http
        destroy loo_JsonMsgIds
        destroy loo_Resp
        return
    end if

    Write-Debug "Response Status Code: " + string(loo_Resp.StatusCode)

    loo_JsonResponse = create oleobject
    li_rc = loo_JsonResponse.ConnectToNewObject("Chilkat.JsonObject")

    loo_JsonResponse.Load(loo_Resp.BodyStr)
    loo_JsonResponse.EmitCompact = 0
    Write-Debug loo_JsonResponse.Emit()

    if loo_Resp.StatusCode <> 200 then
        Write-Debug "Failed."
        destroy loo_Http
        destroy loo_JsonMsgIds
        destroy loo_Resp
        destroy loo_JsonResponse
        return
    end if

    i = i + 1
loop

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


destroy loo_Http
destroy loo_JsonMsgIds
destroy loo_Resp
destroy loo_JsonResponse