(Visual Basic 6.0) Outlook Send Email using MIME Format

See more Outlook Examples

This example sends an email using MIME format via the Microsoft Graph Outlook REST API.

For more information, see https://learn.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=http#example-4-send-a-new-message-using-mime-format

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

Dim http As New ChilkatHttp

' Use your previously obtained access token here:
' See the following examples for getting an access token:
'    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
'    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
'    Refresh Access Token (Azure AD v2.0 Endpoint).
'    Refresh Access Token (Azure AD Endpoint).

Dim jsonToken As New ChilkatJsonObject
Dim success As Long
success = jsonToken.LoadFile("qa_data/tokens/microsoftGraph.json")
If (success = 0) Then
    Debug.Print jsonToken.LastErrorText
    Exit Sub
End If

http.AuthToken = jsonToken.StringOf("access_token")

' To send email, we'll POST to the following endpoint:
' 
' POST /users/{id | userPrincipalName}/sendMail
' 
' (The special keyword "me" may be used in place of a principal name.)
' 

' The body of the POST request will contain the MIME source of the email in base64 format.

' Create a new email object
Dim email As New ChilkatEmail
email.Subject = "Test Outlook API to Send HTML Email with Attachments"
email.From = "Mary <mary@somewhere.com>"
success = email.AddTo("Joe","joe@example.com")

' Add a plain-text alternative body, which will likely never be seen.
' (It is shown if the receiving email client is incapable of displaying HTML email.)
success = email.AddPlainTextAlternativeBody("This is a plain-text alternative body...")

' Our HTML will include an image, so add the related image here.
Dim contentIdStarfish As String
contentIdStarfish = email.AddRelatedFile("qa_data/jpg/starfish.jpg")
If (email.LastMethodSuccess <> 1) Then
    Debug.Print email.LastErrorText
    Exit Sub
End If

' The src attribute for the image tag is set to the contentIdStarfish:
Dim sbHtml As New ChilkatStringBuilder
success = sbHtml.Append("<html><body><p>This is an HTML email with an embedded image.</p>")
success = sbHtml.Append("<p><img src=""cid:CONTENT_ID_STARFISH"" /></p></body></html>")
Dim numReplacements As Long
numReplacements = sbHtml.Replace("CONTENT_ID_STARFISH",contentIdStarfish)

success = email.AddHtmlAlternativeBody(sbHtml.GetAsString())

' Finally, add some attachments to the email.
' Add a file attachment.
success = email.AddFileAttachment2("qa_data/pdf/fishing.pdf","application/pdf")
If (success <> 1) Then
    Debug.Print email.LastErrorText
    Exit Sub
End If

' Add an attachment where the content is contained in a string.
Dim content As String
content = "This is the content of the 2nd attached file."
success = email.AddStringAttachment("someText.txt",content)

' Get the email as multi-line base64..
Dim bdMime As New ChilkatBinData
success = email.GetMimeBd(bdMime)

' Now get it as multi-line base64
Dim sbBase64 As New ChilkatStringBuilder
success = bdMime.GetEncodedSb("base64_mime",sbBase64)

' Send the HTTP POST (i.e. send the email)
Dim resp As ChilkatHttpResponse
Set resp = http.PTextSb("POST","https://graph.microsoft.com/v1.0/me/sendMail",sbBase64,"utf-8","text/plain",0,0)
If (http.LastMethodSuccess <> 1) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

' The send succeeded if the response status code = 202.
' In the success case, there is no response body.  (We just get the response code to know that it succeeded.)
If (resp.StatusCode <> 202) Then
    Dim json As New ChilkatJsonObject
    success = json.Load(resp.BodyStr)
    json.EmitCompact = 0
    Debug.Print json.Emit()
    Debug.Print "Failed, response status code = " & resp.StatusCode
Else
    Debug.Print "Outlook Mail Sent."
End If