(VB.NET UWP/WinRT) Send GMail with Attachments

Demonstrates how to send an email containing attachments 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())

' Add some attachments..
Dim mimeType As String = email.AddFileAttachment("qa_data/helloWorld.pdf")
If (email.LastMethodSuccess <> True) Then
    Debug.WriteLine("Failed to add PDF attachment.")
    Exit Sub
End If

mimeType = email.AddFileAttachment("qa_data/msword/sample2.docx")
If (email.LastMethodSuccess <> True) Then
    Debug.WriteLine("Failed to add MS-Word attachment.")
    Exit Sub
End If


' OK.. we now have an HTML email with 2 attachments..
Dim sbMime As New Chilkat.StringBuilder
email.GetMimeSb(sbMime)

' Send the email.  (GMail has a 5MB limit on the total email size.)
Dim http As New Chilkat.Http
http.AuthToken = "GMAIL-ACCESS-TOKEN"

' Send using the simple upload request for the Gmail API
Dim url As String = "https://www.googleapis.com/upload/gmail/v1/users/me/messages/send?uploadType=media"
Dim sendGzipped As Boolean = True
Dim resp As Chilkat.HttpResponse = Await http.PTextSbAsync("POST",url,sbMime,"utf-8","message/rfc822",False,sendGzipped)
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"
'  ]
' }