Delphi ActiveX

Set a MIME Body, Preserving Content Headers

Demonstrates the Chilkat Mime.SetBody method, which sets the current part's body while preserving the existing content headers (Content-Type, charset, Content-Transfer-Encoding). The only argument is the body text; it is a void method.

Background: Unlike the SetBodyFrom... methods, which set both the content and the headers that describe it, SetBody replaces only the body text and leaves the existing Content-Type and encoding in place. That is what you want when the media type is already correct and you simply need to swap in new content — updating a templated part, for instance — without re-declaring its type.

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var
success: Integer;
mime: TChilkatMime;
mimeText: WideString;

begin
success := 0;

//  Demonstrates the Mime.SetBody method, which sets the current part's body while preserving the
//  existing content headers (Content-Type, charset, Content-Transfer-Encoding).  The only argument
//  is the body text.  It is a void method.

mime := TChilkatMime.Create(Self);

//  Establish the content headers first.
success := mime.SetBodyFromPlainText('initial');
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

//  Replace just the body text, keeping the existing Content-Type and encoding.
mime.SetBody('This is the replacement body text.');

mimeText := mime.GetMime();
if (mime.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add(mimeText);