PowerBuilder

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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integer li_rc
integer li_Success
oleobject loo_Email
oleobject loo_BdImage
string ls_Cid
oleobject loo_SbHtml
integer li_NumReplaced
string ls_Cid0

li_Success = 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.

loo_Email = create oleobject
li_rc = loo_Email.ConnectToNewObject("Chilkat.Email")
if li_rc < 0 then
    destroy loo_Email
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_Email.Subject = "GetRelatedContentID example"

//  Load the image data from a file into a BinData object.
loo_BdImage = create oleobject
li_rc = loo_BdImage.ConnectToNewObject("Chilkat.BinData")

li_Success = loo_BdImage.LoadFile("qa_data/images/logo.png")
if li_Success = 0 then
    Write-Debug loo_BdImage.LastErrorText
    destroy loo_Email
    destroy loo_BdImage
    return
end if

//  Add the image as a related item from the BinData; capture its generated Content-ID.
ls_Cid = loo_Email.AddRelatedBd("logo.png",loo_BdImage)
if loo_Email.LastMethodSuccess = 0 then
    Write-Debug loo_Email.LastErrorText
    destroy loo_Email
    destroy loo_BdImage
    return
end if

//  Reference the related item in the HTML body by its Content-ID.
loo_SbHtml = create oleobject
li_rc = loo_SbHtml.ConnectToNewObject("Chilkat.StringBuilder")

loo_SbHtml.Append("<html><body><img src=~"cid:PLACEHOLDER_CID~"/></body></html>")
li_NumReplaced = loo_SbHtml.Replace("PLACEHOLDER_CID",ls_Cid)
loo_Email.SetHtmlBody(loo_SbHtml.GetAsString())

//  Read the Content-ID of the first related item (index 0).
ls_Cid0 = loo_Email.GetRelatedContentID(0)
Write-Debug "Related item 0 Content-ID: " + ls_Cid0

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


destroy loo_Email
destroy loo_BdImage
destroy loo_SbHtml