VB.NET
SendGrid HTML Email with Embedded Images

Demonstrates how to send an HTML email with embedded images using SendGrid.
Chilkat VB.NET Downloads

VB.NET
Dim success As Boolean = False

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

Dim req As New Chilkat.HttpRequest
Dim http As New Chilkat.Http

' First.. load a JPG file and build an HTML img tag with the JPG data inline encoded.
' Our HTML img tag will look like this:
' <img src="data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEA3ADcAA..." alt="" style="border-width:0px;" />
Dim bdJpg As New Chilkat.BinData
success = bdJpg.LoadFile("qa_data/jpg/starfish.jpg")
If (success = False) Then
    Debug.WriteLine("Failed to load JPG file.")
    Exit Sub
End If


' Note: HTML containing embedded base64 image data may not be visible in all email clients.
' For example, GMail might not display the image, but viewing in Outlook might be OK.
Dim sbHtml As New Chilkat.StringBuilder
sbHtml.Append("<html><body><b>This is a test<b><br /><img src=""data:image/jpeg;base64,")
' Append the base64 image data to sbHtml.
bdJpg.GetEncodedSb("base64",sbHtml)
sbHtml.Append(""" alt="""" style=""border-width:0px;"" /></body></html>")

Dim json As New Chilkat.JsonObject
json.UpdateString("personalizations[0].to[0].email","matt@chilkat.io")
json.UpdateString("personalizations[0].to[0].name","Matt")
json.UpdateString("from.email","admin@chilkatsoft.com")
json.UpdateString("subject","Test HTML email with images")
json.UpdateString("content[0].type","text/html")
json.UpdateSb("content[0].value",sbHtml)

http.AuthToken = "SENDGRID_API_KEY"

Dim resp As New Chilkat.HttpResponse
success = http.HttpJson("POST","https://api.sendgrid.com/v3/mail/send",json,"application/json",resp)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("response status code: " & resp.StatusCode)
' Display the response.
' If successful, the response code is 202 and the response body string is empty.
' (The response body string may also be empty for error response codes.)
Debug.WriteLine(resp.BodyStr)