PowerShell

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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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $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.

$email = New-Object Chilkat.Email
$email.Subject = "GetNthBinaryPartOfTypeBd example"
$email.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).
$bdImage = New-Object Chilkat.BinData
$success = $bdImage.LoadFile("qa_data/images/photo.png")
if ($success -eq $false) {
    $($bdImage.LastErrorText)
    exit
}

$success = $email.AddAttachmentBd("photo.png",$bdImage,"image/png")
if ($success -eq $false) {
    $($email.LastErrorText)
    exit
}

#  Load the bytes of the first (index 0) image/png part into a BinData object.
$bd = New-Object Chilkat.BinData
$success = $email.GetNthBinaryPartOfTypeBd(0,"image/png",$false,$false,$bd)
if ($success -eq $false) {
    $($email.LastErrorText)
    exit
}

$("image/png part size (bytes) = " + $bd.NumBytes)

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