Delphi DLL

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: Boolean;
mime: HCkMime;
mimeText: PWideChar;

begin
success := False;

//  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 := CkMime_Create();

//  Establish the content headers first.
success := CkMime_SetBodyFromPlainText(mime,'initial');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;

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

mimeText := CkMime__getMime(mime);
if (CkMime_getLastMethodSuccess(mime) = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;
Memo1.Lines.Add(mimeText);

CkMime_Dispose(mime);