PowerBuilder

Convert 8-bit MIME Parts to Base64

Demonstrates the Chilkat Mime.Convert8Bit method, which recursively converts every part whose Content-Transfer-Encoding is 8bit or binary to base64. It takes no arguments and is a void method.

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: The original SMTP standard only guaranteed 7-bit transport, and some legacy servers still reject or mangle raw 8-bit and binary content. Converting those parts to base64 — a 7-bit-safe encoding — makes the whole message safe to relay through such systems without loss. It walks the entire tree, so a multipart message with several offending parts is fixed in one call.

Chilkat PowerBuilder Downloads

Download Chilkat for PowerBuilder

PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Mime
string ls_MimeText

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

//  Recursively convert every part whose Content-Transfer-Encoding is 8bit or binary to base64.
//  This makes the MIME safe to transmit over channels that only support 7-bit text (such as some
//  legacy SMTP servers).
loo_Mime.Convert8Bit()

Write-Debug "8bit/binary parts converted to base64."
ls_MimeText = loo_Mime.GetMime()
if loo_Mime.LastMethodSuccess = 0 then
    Write-Debug loo_Mime.LastErrorText
    destroy loo_Mime
    return
end if

Write-Debug ls_MimeText


destroy loo_Mime