Delphi DLL

Add a Related Item from a BinData Object

Demonstrates the Chilkat Email.AddRelatedBd method, which adds a related item (such as an inline image) using the contents of a BinData object, and returns the generated Content-ID. This example loads an image into a BinData, adds it, captures the Content-ID, and references it from the HTML body.

Background: This is the binary, Content-ID-based way to embed an inline resource — the right choice for images, whose bytes belong in a BinData rather than a string. Because Chilkat generates the Content-ID, the usual pattern is: add the item first, capture the returned ID, then build the matching <img src="cid:..."> reference from it (done here with a StringBuilder).

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var
success: Boolean;
email: HCkEmail;
bdImage: HCkBinData;
cid: PWideChar;
sbHtml: HCkStringBuilder;
numReplaced: Integer;

begin
success := False;

//  Demonstrates the AddRelatedBd method, which adds a related item (such as an inline image)
//  using the contents of a BinData object, and returns the generated Content-ID.

email := CkEmail_Create();
CkEmail_putSubject(email,'Related image from BinData');

//  Load the image data from a file into a BinData object.
bdImage := CkBinData_Create();
success := CkBinData_LoadFile(bdImage,'qa_data/images/logo.png');
if (success = False) then
  begin
    Memo1.Lines.Add(CkBinData__lastErrorText(bdImage));
    Exit;
  end;

//  Add the image as a related item; capture its generated Content-ID.
cid := CkEmail__addRelatedBd(email,'logo.png',bdImage);
if (CkEmail_getLastMethodSuccess(email) = False) then
  begin
    Memo1.Lines.Add(CkEmail__lastErrorText(email));
    Exit;
  end;

//  Reference the related item in the HTML body by its Content-ID.
sbHtml := CkStringBuilder_Create();
CkStringBuilder_Append(sbHtml,'<html><body><img src="cid:PLACEHOLDER_CID"/></body></html>');
numReplaced := CkStringBuilder_Replace(sbHtml,'PLACEHOLDER_CID',cid);
CkEmail_SetHtmlBody(email,CkStringBuilder__getAsString(sbHtml));

Memo1.Lines.Add('NumRelatedItems = ' + IntToStr(CkEmail_getNumRelatedItems(email)));

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

CkEmail_Dispose(email);
CkBinData_Dispose(bdImage);
CkStringBuilder_Dispose(sbHtml);