Xbase++

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 nSuccess
LOCAL oEmail
LOCAL oBdImage
LOCAL oBd

nSuccess := 0

//  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 := CreateObject("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 := CreateObject("Chilkat.BinData")
nSuccess := oBdImage:LoadFile("qa_data/images/photo.png")
IF (nSuccess == 0)
    ? oBdImage:LastErrorText
    oEmail:destroy()
    oBdImage:destroy()
    RETURN
ENDIF

nSuccess := oEmail:AddAttachmentBd("photo.png", oBdImage, "image/png")
IF (nSuccess == 0)
    ? oEmail:LastErrorText
    oEmail:destroy()
    oBdImage:destroy()
    RETURN
ENDIF

//  Load the bytes of the first (index 0) image/png part into a BinData object.
oBd := CreateObject("Chilkat.BinData")
nSuccess := oEmail:GetNthBinaryPartOfTypeBd(0, "image/png", 0, 0, oBd)
IF (nSuccess == 0)
    ? oEmail:LastErrorText
    oEmail:destroy()
    oBdImage:destroy()
    oBd:destroy()
    RETURN
ENDIF

? "image/png part size (bytes) = " + Str(oBd: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.

oEmail:destroy()
oBdImage:destroy()
oBd:destroy()