Visual FoxPro

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 lnSuccess
LOCAL loEmail
LOCAL loBdImage
LOCAL loBd

lnSuccess = 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.

loEmail = CreateObject('Chilkat.Email')
loEmail.Subject = "GetNthBinaryPartOfTypeBd example"
loEmail.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).
loBdImage = CreateObject('Chilkat.BinData')
lnSuccess = loBdImage.LoadFile("qa_data/images/photo.png")
IF (lnSuccess = 0) THEN
    ? loBdImage.LastErrorText
    RELEASE loEmail
    RELEASE loBdImage
    CANCEL
ENDIF

lnSuccess = loEmail.AddAttachmentBd("photo.png",loBdImage,"image/png")
IF (lnSuccess = 0) THEN
    ? loEmail.LastErrorText
    RELEASE loEmail
    RELEASE loBdImage
    CANCEL
ENDIF

*  Load the bytes of the first (index 0) image/png part into a BinData object.
loBd = CreateObject('Chilkat.BinData')
lnSuccess = loEmail.GetNthBinaryPartOfTypeBd(0,"image/png",0,0,loBd)
IF (lnSuccess = 0) THEN
    ? loEmail.LastErrorText
    RELEASE loEmail
    RELEASE loBdImage
    RELEASE loBd
    CANCEL
ENDIF

? "image/png part size (bytes) = " + STR(loBd.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.

RELEASE loEmail
RELEASE loBdImage
RELEASE loBd