(Xojo Plugin) Outlook Send Email using MIME Format

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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 Chilkat.Http

// 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 Chilkat.JsonObject
Dim success As Boolean
success = jsonToken.LoadFile("qa_data/tokens/microsoftGraph.json")
If (success = False) Then
    System.DebugLog(jsonToken.LastErrorText)
    Return
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 Chilkat.Email
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 <> True) Then
    System.DebugLog(email.LastErrorText)
    Return
End If

// The src attribute for the image tag is set to the contentIdStarfish:
Dim sbHtml As New Chilkat.StringBuilder
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 Int32
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 <> True) Then
    System.DebugLog(email.LastErrorText)
    Return
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 Chilkat.BinData
success = email.GetMimeBd(bdMime)

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

// Send the HTTP POST (i.e. send the email)
Dim resp As Chilkat.HttpResponse
resp = http.PTextSb("POST","https://graph.microsoft.com/v1.0/me/sendMail",sbBase64,"utf-8","text/plain",False,False)
If (http.LastMethodSuccess <> True) Then
    System.DebugLog(http.LastErrorText)
    Return
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 Chilkat.JsonObject
    success = json.Load(resp.BodyStr)
    json.EmitCompact = False
    System.DebugLog(json.Emit())
    System.DebugLog("Failed, response status code = " + Str(resp.StatusCode))
Else
    System.DebugLog("Outlook Mail Sent.")
End If