PowerBuilder GMail: Get a specific message (format="minimal")

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Gets a specific message using format=minimal.

Documentation: https://developers.google.com/gmail/api/v1/reference/users/messages/get

integer li_rc
oleobject loo_Rest
integer li_Success
oleobject loo_Oauth2
oleobject loo_SbJson
oleobject loo_Json
string ls_Id
string ls_ThreadId
string ls_Snippet
string ls_HistoryId
string ls_InternalDate
integer li_SizeEstimate
integer i
integer li_Count_i
string ls_StrVal

loo_Rest = create oleobject
li_rc = loo_Rest.ConnectToNewObject("Chilkat_9_5_0.Rest")
if li_rc < 0 then
    destroy loo_Rest
    MessageBox("Error","Connecting to COM object failed")
    return
end if

//   Provide a previously obtained OAuth2 access token.
loo_Oauth2 = create oleobject
li_rc = loo_Oauth2.ConnectToNewObject("Chilkat_9_5_0.OAuth2")

loo_Oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN"
loo_Rest.SetAuthOAuth2(loo_Oauth2)

li_Success = loo_Rest.Connect("www.googleapis.com",443,1,1)
if li_Success <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    destroy loo_Oauth2
    return
end if

loo_Rest.AddPathParam("messageId","15fc237e79da4174")

loo_Rest.AddQueryParam("format","minimal")

loo_SbJson = create oleobject
li_rc = loo_SbJson.ConnectToNewObject("Chilkat_9_5_0.StringBuilder")

li_Success = loo_Rest.FullRequestNoBodySb("GET","/gmail/v1/users/me/messages/messageId",loo_SbJson)
if li_Success <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    destroy loo_Oauth2
    destroy loo_SbJson
    return
end if

if loo_Rest.ResponseStatusCode <> 200 then
    Write-Debug "Received error response code: " + string(loo_Rest.ResponseStatusCode)
    Write-Debug "Response body:"
    Write-Debug loo_SbJson.GetAsString()
    destroy loo_Rest
    destroy loo_Oauth2
    destroy loo_SbJson
    return
end if

loo_Json = create oleobject
li_rc = loo_Json.ConnectToNewObject("Chilkat_9_5_0.JsonObject")

loo_Json.LoadSb(loo_SbJson)

//  The following code parses the JSON response.
//  A sample JSON response is shown below the sample code.

ls_Id = loo_Json.StringOf("id")
ls_ThreadId = loo_Json.StringOf("threadId")
ls_Snippet = loo_Json.StringOf("snippet")
ls_HistoryId = loo_Json.StringOf("historyId")
ls_InternalDate = loo_Json.StringOf("internalDate")
li_SizeEstimate = loo_Json.IntOf("sizeEstimate")
i = 0
li_Count_i = loo_Json.SizeOfArray("labelIds")
do while i < li_Count_i
    loo_Json.I = i
    ls_StrVal = loo_Json.StringOf("labelIds[i]")
    i = i + 1
loop

Write-Debug "Example Completed."


destroy loo_Rest
destroy loo_Oauth2
destroy loo_SbJson
destroy loo_Json

Sample JSON Response Body

{
  "id": "15fc237e79da4174",
  "threadId": "15fc237e79da4174",
  "labelIds": [
    "IMPORTANT",
    "SENT",
    "INBOX"
  ],
  "snippet": "This is a test email with 2 attachments.",
  "historyId": "1582",
  "internalDate": "1510791964000",
  "sizeEstimate": 11153
}