delphi - Outlook 对象模型 - 检测电子邮件是否已发送

Question

我的测试 Delphi 2006 BDS 应用程序中有以下代码:

procedure TForm1.Button1Click(Sender: TObject);
const
  olMailItem = 0;
var
  Outlook: OleVariant;
  vMailItem: variant;
begin
  Outlook := CreateOleObject('Outlook.Application');
  vMailItem := Outlook.CreateItem(olMailItem);

  try
    vMailItem.Recipients.add('anemailaddress@gmail.com');
    vMailItem.Display(True); -- outlook mail message is displayed modally
  except
  end;

  VarClear(Outlook);
end;

我需要能够检测用户是否从 Outlook 屏幕内发送电子邮件。我尝试了以下代码:

if vMailItem.Sent then
 ...

但收到错误消息“该项目已被移动或删除”。我认为这是因为邮件已移至已发送邮件文件夹。检测用户是否发送了电子邮件的最佳方法是什么？另外，如果用户确实发送了电子邮件，那么我还需要能够查看电子邮件正文。

提前致谢。

Answer 1

看来你必须使用 Send Event邮件项目的。如果您使用早期绑定(bind)，这会容易得多，将“outlook[*].pas”文件之一放入“uses”子句中 RAD studio 的“..\OCX\Servers”文件夹中，然后:

uses
  ..., outlook2000;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    OutlookApplication: TOutlookApplication;
    procedure OnMailSend(Sender: TObject; var Cancel: WordBool);
  public
  end;

[...]

procedure TForm1.FormCreate(Sender: TObject);
begin
  OutlookApplication := TOutlookApplication.Create(Self);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  MailItem: _MailItem;
  Mail: TMailItem;
begin
  MailItem := OutlookApplication.CreateItem(olMailItem) as _MailItem;

  Mail := TMailItem.Create(nil);
  try
    Mail.ConnectTo(MailItem);
    Mail.OnSend := OnMailSend;

    MailItem.Recipients.Add('username@example.com');
    MailItem.Display(True);
  finally
    Mail.Free;
  end;
end;

procedure TForm1.OnMailSend(Sender: TObject; var Cancel: WordBool);
begin
  ShowMessage((Sender as TMailItem).Body);
end;
 

使用后期绑定(bind)，您必须执行导入包装器所做的一些工作。最简单的例子可能是这样的:

 
type
  TForm1 = class(TForm, IDispatch)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    FCookie: Integer;
    FMailItem: OleVariant;
    procedure MailSent;
  protected
    function QueryInterface(const IID: TGUID; out Obj): HResult; override;
    function Invoke(DispID: Integer; const IID: TGUID; LocaleID: Integer;
      Flags: Word; var Params; VarResult, ExcepInfo, ArgErr: Pointer): HResult;
      stdcall;
  public
  end;

[...]

uses
  comobj;

const
  DIID_ItemEvents: TGUID = '{0006303A-0000-0000-C000-000000000046}';
  SendItemDispID = 61445;

function TForm1.QueryInterface(const IID: TGUID; out Obj): HResult;
begin
  if IsEqualIID(IID, DIID_ItemEvents) and GetInterface(IDispatch, Obj) then
    Result := S_OK
  else
    Result := inherited QueryInterface(IID, Obj);
end;

function TForm1.Invoke(DispID: Integer; const IID: TGUID; LocaleID: Integer;
  Flags: Word; var Params; VarResult, ExcepInfo, ArgErr: Pointer): HResult;
begin
  Result := S_OK;
  if DispID = SendItemDispID then
    MailSent;
end;


procedure TForm1.Button1Click(Sender: TObject);
const
  olMailItem = 0;
var
  Outlook: OleVariant;
  CPContainer: IConnectionPointContainer;
  ConnectionPoint: IConnectionPoint;
begin
  Outlook := CreateOleObject('Outlook.Application');
  FMailItem := Outlook.CreateItem(olMailItem);
  FMailItem.Recipients.add('username@example.com');

  if Supports(FMailItem, IConnectionPointContainer, CPContainer) then begin
    CPContainer.FindConnectionPoint(DIID_ItemEvents, ConnectionPoint);
    if Assigned(ConnectionPoint) then
      ConnectionPoint.Advise(Self, FCookie);
    CPContainer := nil;
  end;

  FMailItem.Display(True);

  if Assigned(ConnectionPoint) then begin
    ConnectionPoint.Unadvise(FCookie);
    ConnectionPoint := nil;
  end;

  VarClear(FMailItem);
  VarClear(Outlook);
end;

procedure TForm1.MailSent;
begin
  ShowMessage(FMailItem.Body);
end;