B4X

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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Dim success As Boolean = 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.

Dim email As ChilkatEmail
email.Initialize
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).
Dim bdImage As ChilkatBinData
bdImage.Initialize
success = bdImage.LoadFile("qa_data/images/photo.png")
If success = False Then
    Log(bdImage.LastErrorText)
    Return
End If

success = email.AddAttachmentBd("photo.png", bdImage, "image/png")
If success = False Then
    Log(email.LastErrorText)
    Return
End If


'  Load the bytes of the first (index 0) image/png part into a BinData object.
Dim bd As ChilkatBinData
bd.Initialize
success = email.GetNthBinaryPartOfTypeBd(0, "image/png", False, False, bd)
If success = False Then
    Log(email.LastErrorText)
    Return
End If


Log("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.