(VB.NET) Download a Specific GMail Message into a Chilkat Email Object

Demonstrates how to download a GMail message into a Chilkat Email object.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

Dim success As Boolean

Dim http As New Chilkat.Http
http.AuthToken = "GMAIL-ACCESS-TOKEN"

' The id of the GMail message to download.
Dim id As String = "166e50fed0b9b0cb"
Dim userId As String = "me"

http.SetUrlVar("userId","me")
http.SetUrlVar("id",id)

' Fetch the email.
Dim url As String = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages/{$id}?format=raw"
Dim sbJson As New Chilkat.StringBuilder
success = http.DownloadSb(url,"utf-8",sbJson)
If (success <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim json As New Chilkat.JsonObject
json.LoadSb(sbJson)
json.EmitCompact = False

If (http.LastStatus <> 200) Then
    Debug.WriteLine(json.Emit())
    Debug.WriteLine("Failed.")
    Exit Sub
End If


' The returned JSON contains something like this:

' {
'   "id": "166e50fed0b9b0cb",
'   "threadId": "166e50fed0b9b0cb",
'   "labelIds": [
'     "CATEGORY_SOCIAL",
'     "INBOX"
'   ],
'   "snippet": "...",
'   "historyId": "582477",
'   "internalDate": "1541441317000",
'   "sizeEstimate": 28603,
'   "raw": "BASE64URL_CONTENT"
' }

' The RFC822 MIME of the email is contained in the "raw" as a base64URL encoded string.
' Let's decode and load into a Chilkat email object..
Dim sbRaw As New Chilkat.StringBuilder
json.StringOfSb("raw",sbRaw)
sbRaw.Decode("base64url","utf-8")

Dim email As New Chilkat.Email
email.SetFromMimeSb(sbRaw)

' Now we can use the email API to do whatever we desire..
Debug.WriteLine("From: " & email.FromAddress)
Debug.WriteLine("Subject: " & email.Subject)
' ...