(VB.NET UWP/WinRT) Send GMail using REST API

Demonstrates how to send an email using the GMail REST API.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

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

Dim success As Boolean

' Use the Chilkat Email API to create or load an email.
Dim email As New Chilkat.Email

' The From name/address don't need to be specified. 
' GMail will automatically use your Gmail address if the following 2 lines are omitted.
email.FromName = "My Name"
email.FromAddress = "my_account_name@gmail.com"

email.AddTo("John Smith","somebody@somewhere.com")
' To add more recipients, make additional calls to AddTo or AddCC, one per recipient...

email.Subject = "This is a test GMail email created using Chilkat."
email.Charset = "utf-8"
email.AddPlainTextAlternativeBody("This is a test")

' Create an HTML email body with an embedded image.
Dim cid As String = email.AddRelatedFile("qa_data/jpg/starfish.jpg")
Dim sbHtml As New Chilkat.StringBuilder
sbHtml.Append("<html><body>This is a <b>test</b><br><img src=""cid:STARFISH_CID""/></body></html>")
Dim numReplacements As Integer = sbHtml.Replace("STARFISH_CID",cid)

email.AddHtmlAlternativeBody(sbHtml.GetAsString())

' OK.. we now have an HTML email with an embedded JPG image
' We'll need to get the full MIME of the email encoded to a base64url string.
Dim sbMime As New Chilkat.StringBuilder
email.GetMimeSb(sbMime)
sbMime.Encode("base64url","utf-8")

' The body of the HTTP request will be JSON..
Dim json As New Chilkat.JsonObject
json.UpdateSb("raw",sbMime)

' Send the email...
Dim http As New Chilkat.Http
http.AuthToken = "GMAIL-ACCESS-TOKEN"

Dim url As String = "https://www.googleapis.com/gmail/v1/users/me/messages/send"
Dim resp As Chilkat.HttpResponse = Await http.PostJson3Async(url,"application/json",json)
If (http.LastMethodSuccess <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' A status code of 200 indicates success.
Debug.WriteLine("Response status code: " & resp.StatusCode)
Debug.WriteLine("Response body:")
Debug.WriteLine(resp.BodyStr)


' The response body contains JSON.
' Use the online tool at Generate JSON Parsing Code
' to generate JSON parsing code.

' A sample successful JSON response:

' {
'  "id": "166f0d4ac39e50bf",
'  "threadId": "166f0d4ac39e50bf",
'  "labelIds": [
'   "SENT"
'  ]
' }