PowerBuilder

Convert a MIME Entity to multipart/alternative

Demonstrates the Chilkat Mime.ConvertToMultipartAlt method, which wraps the current entity in a new outer multipart/alternative, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Use this to add an alternate rendering to an existing message — for example, promoting a plain-text message so an HTML version can be added alongside it. The original content becomes the first (least-preferred) alternative, and you append the richer representation after it. As with the mixed conversion, message-level headers move to the new outer entity.

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PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Mime
oleobject loo_HtmlPart

li_Success = 0

loo_Mime = create oleobject
li_rc = loo_Mime.ConnectToNewObject("Chilkat.Mime")
if li_rc < 0 then
    destroy loo_Mime
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_Success = loo_Mime.LoadMimeFile("qa_data/message.eml")
if li_Success = 0 then
    Write-Debug loo_Mime.LastErrorText
    destroy loo_Mime
    return
end if

//  Wrap the current entity in a new outer multipart/alternative entity.  The original entity
//  becomes the first child, ready for an alternate representation to be added.
li_Success = loo_Mime.ConvertToMultipartAlt()
if li_Success = 0 then
    Write-Debug loo_Mime.LastErrorText
    destroy loo_Mime
    return
end if

//  Add an alternative representation of the same content.
loo_HtmlPart = create oleobject
li_rc = loo_HtmlPart.ConnectToNewObject("Chilkat.Mime")

li_Success = loo_HtmlPart.SetBodyFromHtml("<html><body>HTML alternative.</body></html>")
if li_Success = 0 then
    Write-Debug loo_HtmlPart.LastErrorText
    destroy loo_Mime
    destroy loo_HtmlPart
    return
end if

li_Success = loo_Mime.AppendPart(loo_HtmlPart)
if li_Success = 0 then
    Write-Debug loo_Mime.LastErrorText
    destroy loo_Mime
    destroy loo_HtmlPart
    return
end if

Write-Debug "Number of parts: " + string(loo_Mime.NumParts)


destroy loo_Mime
destroy loo_HtmlPart