Visual FoxPro

Get the Content-ID of a Related Item

Demonstrates the Chilkat Email.GetRelatedContentID method, which returns the Content-ID of a related item (typically an image or style sheet embedded within an HTML email). The index is zero-based. This example loads an image from a file into a BinData object, adds it as a related item with AddRelatedBd (capturing the generated Content-ID and referencing it from the HTML), then reads that Content-ID back.

Background: The Content-ID is the anchor that ties an inline resource to the HTML that displays it: the body references cid: plus the ID, and the matching related part carries that same Content-ID. Because an image is binary, it is loaded into a BinData object (here from a file) and added with AddRelatedBd. Reading the Content-ID back lets a program verify or rewrite those links — for example when relocating embedded images or converting a message for display outside a mail client.

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LOCAL lnSuccess
LOCAL loEmail
LOCAL loBdImage
LOCAL lcCid
LOCAL loSbHtml
LOCAL lnNumReplaced
LOCAL lcCid0

lnSuccess = 0

*  Demonstrates the GetRelatedContentID method, which returns the Content-ID of a related
*  item.  Related items are typically images and style sheets embedded within HTML emails.
*  The index is zero-based.

loEmail = CreateObject('Chilkat.Email')
loEmail.Subject = "GetRelatedContentID example"

*  Load the image data from a file into a BinData object.
loBdImage = CreateObject('Chilkat.BinData')
lnSuccess = loBdImage.LoadFile("qa_data/images/logo.png")
IF (lnSuccess = 0) THEN
    ? loBdImage.LastErrorText
    RELEASE loEmail
    RELEASE loBdImage
    CANCEL
ENDIF

*  Add the image as a related item from the BinData; capture its generated Content-ID.
lcCid = loEmail.AddRelatedBd("logo.png",loBdImage)
IF (loEmail.LastMethodSuccess = 0) THEN
    ? loEmail.LastErrorText
    RELEASE loEmail
    RELEASE loBdImage
    CANCEL
ENDIF

*  Reference the related item in the HTML body by its Content-ID.
loSbHtml = CreateObject('Chilkat.StringBuilder')
loSbHtml.Append('<html><body><img src="cid:PLACEHOLDER_CID"/></body></html>')
lnNumReplaced = loSbHtml.Replace("PLACEHOLDER_CID",lcCid)
loEmail.SetHtmlBody(loSbHtml.GetAsString())

*  Read the Content-ID of the first related item (index 0).
lcCid0 = loEmail.GetRelatedContentID(0)
? "Related item 0 Content-ID: " + lcCid0

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

RELEASE loEmail
RELEASE loBdImage
RELEASE loSbHtml