Delphi ActiveX

Get an Alternative Body into a BinData

Demonstrates the Chilkat Email.GetAlternativeBodyBd method, which copies the contents of the Nth alternative body into a BinData object. The first alternative body is at index 0, and it should only be called when NumAlternatives is greater than 0. This example builds a message with plain-text and HTML alternatives and copies the first into a BinData.

Background: This is the binary counterpart to GetAlternativeBody (which returns text). Reading an alternative into a BinData preserves the exact bytes — important when a body part uses a binary or unusual transfer encoding, or when you intend to hash it or write it out verbatim rather than decode it to a string.

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var
success: Integer;
email: TChilkatEmail;
bd: TChilkatBinData;

begin
success := 0;

//  Demonstrates the GetAlternativeBodyBd method, which copies the contents of the Nth
//  alternative body into a BinData object.  The first alternative body is at index 0; call
//  only when NumAlternatives is greater than 0.

email := TChilkatEmail.Create(Self);
email.Subject := 'GetAlternativeBodyBd example';

email.SetTextBody('This is the plain-text alternative.','text/plain');
email.AddHtmlAlternativeBody('<html><body>This is the HTML alternative.</body></html>');

//  Copy the first alternative body (index 0) into a BinData object.
bd := TChilkatBinData.Create(Self);

success := email.GetAlternativeBodyBd(0,bd.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(email.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Alternative 0 size (bytes) = ' + IntToStr(bd.NumBytes));