CkPython

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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import sys
import chilkat

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 = chilkat.CkEmail()
email.put_Subject("GetNthBinaryPartOfTypeBd example")
email.put_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 = chilkat.CkBinData()
success = bdImage.LoadFile("qa_data/images/photo.png")
if (success == False):
    print(bdImage.lastErrorText())
    sys.exit()

success = email.AddAttachmentBd("photo.png",bdImage,"image/png")
if (success == False):
    print(email.lastErrorText())
    sys.exit()

#  Load the bytes of the first (index 0) image/png part into a BinData object.
bd = chilkat.CkBinData()
success = email.GetNthBinaryPartOfTypeBd(0,"image/png",False,False,bd)
if (success == False):
    print(email.lastErrorText())
    sys.exit()

print("image/png part size (bytes) = " + str(bd.get_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.