unit MapiControl;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls,
  Forms, Dialogs;

type
  { Вводим новый тип события для получения Errorcode }
  TMapiErrEvent = procedure(Sender: TObject; ErrCode: Integer) of object;

  TMapiControl = class(TComponent)
      constructor Create(AOwner: TComponent); override;
      destructor Destroy; override;
    private
    { Private-объявления }
    FSubject: string;
    FMailtext: string;
    FFromName: string;
    FFromAdress: string;
    FTOAdr: TStrings;
    FCCAdr: TStrings;
    FBCCAdr: TStrings;
    FAttachedFileName: TStrings;
    FDisplayFileName: TStrings;
    FShowDialog: Boolean;
    FUseAppHandle: Boolean;
    { Error Events: }
    FOnUserAbort: TNotifyEvent;
    FOnMapiError: TMapiErrEvent;
    FOnSuccess: TNotifyEvent;
    { +> Изменения, внесённые Eugene Mayevski [mailto:Mayevski@eldos.org]}
    procedure SetToAddr(newValue : TStrings);
    procedure SetCCAddr(newValue : TStrings);
    procedure SetBCCAddr(newValue : TStrings);
    procedure SetAttachedFileName(newValue : TStrings);
    { +< конец изменений }
  protected
    { Protected-объявления }
  public
    { Public-объявления }
    ApplicationHandle: THandle;
    procedure Sendmail();
    procedure Reset();
  published
    { Published-объявления }
    property Subject: string read FSubject write FSubject;
    property Body: string read FMailText write FMailText;
    property FromName: string read FFromName write FFromName;
    property FromAdress: string read FFromAdress write FFromAdress;
    property Recipients: TStrings read FTOAdr write SetTOAddr;
    property CopyTo: TStrings read FCCAdr write SetCCAddr;
    property BlindCopyTo: TStrings read FBCCAdr write SetBCCAddr;
    property AttachedFiles: TStrings read FAttachedFileName write SetAttachedFileName;
    property DisplayFileName: TStrings read FDisplayFileName;
    property ShowDialog: Boolean read FShowDialog write FShowDialog;
    property UseAppHandle: Boolean read FUseAppHandle write FUseAppHandle;

    { события: }
    property OnUserAbort: TNotifyEvent read FOnUserAbort write FOnUserAbort;
    property OnMapiError: TMapiErrEvent read FOnMapiError write FOnMapiError;
    property OnSuccess: TNotifyEvent read FOnSuccess write FOnSuccess;
end;

procedure register;

implementation

uses Mapi;

{ регистрируем компонент: }
procedure register;
begin
  RegisterComponents('expectIT', [TMapiControl]);
end;

{ TMapiControl }

constructor TMapiControl.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FOnUserAbort := nil;
  FOnMapiError := nil;
  FOnSuccess := nil;
  FSubject := '';
  FMailtext := '';
  FFromName := '';
  FFromAdress := '';
  FTOAdr := TStringList.Create;
  FCCAdr := TStringList.Create;
  FBCCAdr := TStringList.Create;
  FAttachedFileName := TStringList.Create;
  FDisplayFileName := TStringList.Create;
  FShowDialog := False;
  ApplicationHandle := Application.Handle;
end;

{ +> Изменения, внесённые Eugene Mayevski [mailto:Mayevski@eldos.org]}
procedure TMapiControl.SetToAddr(newValue : TStrings);
begin
  FToAdr.Assign(newValue);
end;

procedure TMapiControl.SetCCAddr(newValue : TStrings);
begin
  FCCAdr.Assign(newValue);
end;

procedure TMapiControl.SetBCCAddr(newValue : TStrings);
begin
  FBCCAdr.Assign(newValue);
end;

procedure TMapiControl.SetAttachedFileName(newValue : TStrings);
begin
  FAttachedFileName.Assign(newValue);
end;
{ +< конец изменений }

destructor TMapiControl.Destroy;
begin
  FTOAdr.Free;
  FCCAdr.Free;
  FBCCAdr.Free;
  FAttachedFileName.Free;
  FDisplayFileName.Free;
  inherited destroy;
end;

{ Сбрасываем все используемые поля}
procedure TMapiControl.Reset;
begin
  FSubject := '';
  FMailtext := '';
  FFromName := '';
  FFromAdress := '';
  FTOAdr.Clear;
  FCCAdr.Clear;
  FBCCAdr.Clear;
  FAttachedFileName.Clear;
  FDisplayFileName.Clear;
end;

{ Эта процедура составляет и отправляет Email }
procedure TMapiControl.Sendmail;
var
  MapiMessage: TMapiMessage;
  MError: Cardinal;
  Sender: TMapiRecipDesc;
  PRecip, Recipients: PMapiRecipDesc;
  PFiles, Attachments: PMapiFileDesc;
  i: Integer;
  AppHandle: THandle;
begin
  { Перво-наперво сохраняем Handle приложения, if not
  the Component might fail to send the Email or
  your calling Program gets locked up. }
  AppHandle := Application.Handle;

  { Нам нужно зарезервировать память для всех получателей }
  MapiMessage.nRecipCount := FTOAdr.Count + FCCAdr.Count + FBCCAdr.Count;
  GetMem(Recipients, MapiMessage.nRecipCount * sizeof(TMapiRecipDesc));

  try
    with MapiMessage do
    begin
      ulReserved := 0;
      { Устанавливаем поле Subject: }
      lpszSubject := PChar(Self.FSubject);

      { ... Body: }
      lpszNoteText := PChar(FMailText);

      lpszMessageType := nil;
      lpszDateReceived := nil;
      lpszConversationID := nil;
      flFlags := 0;

      { и отправителя: (MAPI_ORIG) }
      Sender.ulReserved := 0;
      Sender.ulRecipClass := MAPI_ORIG;
      Sender.lpszName := PChar(FromName);
      Sender.lpszAddress := PChar(FromAdress);
      Sender.ulEIDSize := 0;
      Sender.lpEntryID := nil;
      lpOriginator := @Sender;

      PRecip := Recipients;

      { У нас много получателей письма: (MAPI_TO)
      установим для каждого: }
      if nRecipCount > 0 then
      begin
        for i := 1 to FTOAdr.Count do
        begin
          PRecip^.ulReserved := 0;
          PRecip^.ulRecipClass := MAPI_TO;
          { lpszName should carry the Name like in the
          contacts or the adress book, I will take the
          email adress to keep it short: }
          PRecip^.lpszName := PChar(FTOAdr.Strings[i - 1]);
          { Если Вы используете этот компонент совместно с Outlook97 или 2000
          (не Express версии) , то Вам прийдётся добавить
          'SMTP:' в начало каждого (email-) адреса.
          }
          PRecip^.lpszAddress := PChar('SMTP:' + FTOAdr.Strings[i - 1]);
          PRecip^.ulEIDSize := 0;
          PRecip^.lpEntryID := nil;
          Inc(PRecip);
        end;

        { То же самое проделываем с получателями копии письма: (CC, MAPI_CC) }
        for i := 1 to FCCAdr.Count do
        begin
          PRecip^.ulReserved := 0;
          PRecip^.ulRecipClass := MAPI_CC;
          PRecip^.lpszName := PChar(FCCAdr.Strings[i - 1]);
          PRecip^.lpszAddress := PChar('SMTP:' + FCCAdr.Strings[i - 1]);
          PRecip^.ulEIDSize := 0;
          PRecip^.lpEntryID := nil;
          Inc(PRecip);
        end;

        { ... тоже самое для Bcc: (BCC, MAPI_BCC) }
        for i := 1 to FBCCAdr.Count do
        begin
          PRecip^.ulReserved := 0;
          PRecip^.ulRecipClass := MAPI_BCC;
          PRecip^.lpszName := PChar(FBCCAdr.Strings[i - 1]);
          PRecip^.lpszAddress := PChar('SMTP:' + FBCCAdr.Strings[i - 1]);
          PRecip^.ulEIDSize := 0;
          PRecip^.lpEntryID := nil;
          Inc(PRecip);
        end;
      end;
      lpRecips := Recipients;

      { Теперь обработаем прикреплённые к письму файлы: }

      if FAttachedFileName.Count > 0 then
      begin
        nFileCount := FAttachedFileName.Count;
        GetMem(Attachments, MapiMessage.nFileCount * sizeof(TMapiFileDesc));

        PFiles := Attachments;

        { Во первых установим отображаемые на экране имена файлов (без пути): }
        FDisplayFileName.Clear;
        for i := 0 to FAttachedFileName.Count - 1 do
          FDisplayFileName.Add(ExtractFileName(FAttachedFileName[i]));

        if nFileCount > 0 then
        begin
          { Теперь составим структурку для прикреплённого файла: }
          for i := 1 to FAttachedFileName.Count do
          begin
            { Устанавливаем полный путь }
            Attachments^.lpszPathName := PChar(FAttachedFileName.Strings[i - 1]);
            { ... и имя, отображаемое на дисплее: }
            Attachments^.lpszFileName := PChar(FDisplayFileName.Strings[i - 1]);
            Attachments^.ulReserved := 0;
            Attachments^.flFlags := 0;
            { Положение должно быть -1, за разьяснениями обращайтесь в WinApi Help. }
            Attachments^.nPosition := Cardinal(-1);
            Attachments^.lpFileType := nil;
            Inc(Attachments);
          end;
        end;
        lpFiles := PFiles;
      end
      else
      begin
        nFileCount := 0;
        lpFiles := nil;
      end;
    end;

    {
    Send the Mail, silent or verbose:
    Verbose means in Express a Mail is composed and shown as setup.
    In non-Express versions we show the Login-Dialog for a new
    session and after we have choosen the profile to use, the
    composed email is shown before sending

    Silent does currently not work for non-Express version. We have
    no Session, no Login Dialog so the system refuses to compose a
    new email. In Express Versions the email is sent in the
    background.
    }
    if FShowDialog then
      MError := MapiSendMail(0, AppHandle, MapiMessage, MAPI_DIALOG 
      or MAPI_LOGON_UI or MAPI_NEW_SESSION, 0)
    else
      MError := MapiSendMail(0, AppHandle, MapiMessage, 0, 0);

    {
    Теперь обработаем сообщения об ошибках. В MAPI их присутствует достаточное.
    количество. В этом примере я обрабатываю только два из них: USER_ABORT и SUCCESS,
    относящиеся к специальным.

    Сообщения, не относящиеся к специальным:
    MAPI_E_AMBIGUOUS_RECIPIENT,
    MAPI_E_ATTACHMENT_NOT_FOUND,
    MAPI_E_ATTACHMENT_OPEN_FAILURE,
    MAPI_E_BAD_RECIPTYPE,
    MAPI_E_FAILURE,
    MAPI_E_INSUFFICIENT_MEMORY,
    MAPI_E_LOGIN_FAILURE,
    MAPI_E_TEXT_TOO_LARGE,
    MAPI_E_TOO_MANY_FILES,
    MAPI_E_TOO_MANY_RECIPIENTS,
    MAPI_E_UNKNOWN_RECIPIENT:
    }

    case MError of
      MAPI_E_USER_ABORT:
      begin
        if Assigned(FOnUserAbort) then
          FOnUserAbort(Self);
      end;
      SUCCESS_SUCCESS:
      begin
        if Assigned(FOnSuccess) then
          FOnSuccess(Self);
      end
      else
      begin
        if Assigned(FOnMapiError) then
          FOnMapiError(Self, MError);
      end;
    end;
  finally
    { В заключение освобождаем память }
    FreeMem(Recipients, MapiMessage.nRecipCount * sizeof(TMapiRecipDesc));
  end;
end;
{ Вопросы и замечания присылайте Автору. }
end.