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Get the Nth Binary Part of a Content-Type into BinData

Demonstrates the Chilkat Email.GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth MIME sub-part matching a content-type pattern into a BinData object. The arguments are the zero-based index among the matching parts, the content-type pattern, an inlineOnly flag, an excludeAttachments flag, and the BinData that receives the bytes. This example extracts the first image/png part.

Background: This is the binary, type-targeted way to pull a specific part out of a message — ideal for extracting, say, every image/png or the one application/pdf from a complex MIME tree without caring whether it is an attachment, an inline image, or a body part. Reading into a BinData keeps the raw bytes exact, ready to save, hash, or re-transmit.

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Local $bSuccess = False

;  Demonstrates the GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth
;  MIME sub-part matching a Content-Type pattern into a BinData object.  The arguments are
;  the zero-based index among matching parts, the Content-Type pattern, inlineOnly,
;  excludeAttachments, and the BinData that receives the bytes.

$oEmail = ObjCreate("Chilkat.Email")
$oEmail.Subject = "GetNthBinaryPartOfTypeBd example"
$oEmail.Body = "See the attached image."

;  Load the image from a file into a BinData object and attach it (binary data belongs
;  in a BinData, never in a string).
$oBdImage = ObjCreate("Chilkat.BinData")
$bSuccess = $oBdImage.LoadFile("qa_data/images/photo.png")
If ($bSuccess = False) Then
    ConsoleWrite($oBdImage.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oEmail.AddAttachmentBd("photo.png",$oBdImage,"image/png")
If ($bSuccess = False) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

;  Load the bytes of the first (index 0) image/png part into a BinData object.
$oBd = ObjCreate("Chilkat.BinData")
$bSuccess = $oEmail.GetNthBinaryPartOfTypeBd(0,"image/png",False,False,$oBd)
If ($bSuccess = False) Then
    ConsoleWrite($oEmail.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("image/png part size (bytes) = " & $oBd.NumBytes & @CRLF)

;  Note: The path "qa_data/images/photo.png" is a relative local filesystem path,
;  relative to the current working directory of the running application.