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#115: How can I create an email message using MAPI?

Few months ago I posted a code sample for email sending using MS Outlook as OLE-object. Today I want to post a tip for email sending using MAPI. Using MAPI you can control the default mailer whcih was installed in MS Windows - MS Outlook, MS Outlook Express, Lotus, Netscape etc

The SendMail procedure (view below) can be used in any your project - just call with parameteres:

function SendMail(const Subject, Body, FileName,
                  SenderName, SenderEMail,
                  RecipientName, RecipientEMail: string): Integer;
var
  Message: TMapiMessage;
  lpSender, lpRecipient: TMapiRecipDesc;
  FileAttach: TMapiFileDesc;

  SM: TFNMapiSendMail;
  MAPIModule: HModule;
begin
  FillChar(Message, SizeOf(Message), 0);
  with Message do
  begin
    if (Subject <> '') then
      lpszSubject := PChar(Subject);

    if (Body <> '') then
      lpszNoteText := PChar(Body);

    if (SenderEmail <> '') then
    begin
      lpSender.ulRecipClass := MAPI_ORIG;
      if (SenderName = '') then
        lpSender.lpszName := PChar(SenderEMail)
      else
        lpSender.lpszName := PChar(SenderName);
      lpSender.lpszAddress := PChar(SenderEmail);
      lpSender.ulReserved := 0;
      lpSender.ulEIDSize := 0;
      lpSender.lpEntryID := nil;
      lpOriginator := @lpSender;
    end;

    if (RecipientEmail <> '') then
    begin
      lpRecipient.ulRecipClass := MAPI_TO;
      if (RecipientName = '') then
        lpRecipient.lpszName := PChar(RecipientEMail)
      else
        lpRecipient.lpszName := PChar(RecipientName);
      lpRecipient.lpszAddress := PChar(RecipientEmail);
      lpRecipient.ulReserved := 0;
      lpRecipient.ulEIDSize := 0;
      lpRecipient.lpEntryID := nil;
      nRecipCount := 1;
      lpRecips := @lpRecipient;
    end
    else
      lpRecips := nil;

    if (FileName = '') then
    begin
      nFileCount := 0;
      lpFiles := nil;
    end
    else
    begin
      FillChar(FileAttach, SizeOf(FileAttach), 0);
      FileAttach.nPosition := Cardinal($FFFFFFFF);
      FileAttach.lpszPathName := PChar(FileName);

      nFileCount := 1;
      lpFiles := @FileAttach;
    end;
  end;

  MAPIModule := LoadLibrary(PChar(MAPIDLL));
  if MAPIModule = 0 then
    Result := -1
  else
    try
      @SM := GetProcAddress(MAPIModule, 'MAPISendMail');
      if @SM <> nil then
      begin
        Result := SM(0, Application.Handle, Message, MAPI_DIALOG or MAPI_LOGON_UI, 0);
      end
      else
        Result := 1;
    finally
      FreeLibrary(MAPIModule);
    end;

  if Result <> 0 then
    MessageDlg('Error sending mail (' + IntToStr(Result) + ').', mtError,
[mbOK], 0);
end;

PS: you must add the MAPI unit in USES-clause. To execute this procedure:

procedure TForm1.Button1Click(Sender: TObject);
begin
  SendMail('Re: mailing from Delphi',
           'Welcome to http://www.scalabium.com'#13#10'Mike Shkolnik',
           'c:\autoexec.bat',
           'your name', 'your@address.com',
           'Mike Shkolnik', 'mshkolnik@scalabium.com');
end;

Of course, the any parameter of this procedure can be empty.


Published: February 12, 2001

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