如何使用MAPI发送E-MAIL

unit MapiControl;

interface

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

type
{ Introducing a new Type of Event to get the Errorcode }
TMapiErrEvent = procedure(Sender: TObject; ErrCode: Integer) of object;

TMapiControl = class(TComponent)
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
private

{ Private-Deklarationen }

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;
{ +> Changes by Eugene Mayevski [mailto:Mayevski@eldos.org]}
procedure SetToAddr(newValue : TStrings);
procedure SetCCAddr(newValue : TStrings);
procedure SetBCCAddr(newValue : TStrings);
procedure SetAttachedFileName(newValue : TStrings);

{ +< Changes }

protected

{ Protected-Deklarationen }

public

{ Public-Deklarationen }

ApplicationHandle: THandle;
procedure Sendmail();
procedure Reset();
published

{ Published-Deklarationen }

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;

{ Events: }

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;

{ Register the component: }

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;

{ +> Changes by 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;
{ +< Changes }

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

{ Reset the fields for re-use}
procedure TMapiControl.Reset;
begin
FSubject := '';
FMailtext := '';
FFromName := '';
FFromAdress := '';
FTOAdr.Clear;
FCCAdr.Clear;
FBCCAdr.Clear;
FAttachedFileName.Clear;
FDisplayFileName.Clear;
end;

{ Send the Mail via the API, this procedure composes and sends
the Email }
procedure TMapiControl.Sendmail;
var
MapiMessage: TMapiMessage;
MError: Cardinal;
Sender: TMapiRecipDesc;
PRecip, Recipients: PMapiRecipDesc;
PFiles, Attachments: PMapiFileDesc;
i: Integer;
AppHandle: THandle;
begin

{ First we store the Application Handle, if not
the Component might fail to send the Email or
your calling Program gets locked up. }

AppHandle := Application.Handle;

{ We need all recipients to alloc the memory }

MapiMessage.nRecipCount := FTOAdr.Count + FCCAdr.Count + FBCCAdr.Count;
GetMem(Recipients, MapiMessage.nRecipCount * sizeof(TMapiRecipDesc));

try
with MapiMessage do
begin
ulReserved := 0;
{ Setting the Subject: }

lpszSubject := PChar(Self.FSubject);

{ ... the Body: }

lpszNoteText := PChar(FMailText);

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

{ and the sender: (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;

{ We have multiple recipients: (MAPI_TO)
and setting up each: }
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]);
{ If you use this component with Outlook97 or 2000
and not some of Express versions you will have to set
'SMTP:' in front of each (email-) adress. Otherwise
Outlook/Mapi will try to handle the Email on itself.
Sounds strange, just erease the 'SMTP:', compile, compose
a mail and take a look at the resulting email adresses
(right click)}

PRecip^.lpszAddress := PChar('SMTP:' + FTOAdr.Strings[i - 1]);
PRecip^.ulEIDSize := 0;
PRecip^.lpEntryID := nil;
Inc(PRecip);
end;

{ Same with the carbon copy recipients: (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;

{ ... and the blind copy recipients: (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;

{ Now we process the attachments: }

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

PFiles := Attachments;

{ Fist setting up the display names (without path): }
FDisplayFileName.Clear;
for i := 0 to FAttachedFileName.Count - 1 do
FDisplayFileName.Add(ExtractFileName(FAttachedFileName[i]));

if nFileCount > 0 then
begin
{ Now we pass the attached file (their paths) to the
structure: }
for i := 1 to FAttachedFileName.Count do
begin
{ Setting the complete Path }
Attachments^.lpszPathName := PChar(FAttachedFileName.Strings[i - 1]);
{ ... and the displayname: }
Attachments^.lpszFileName := PChar(FDisplayFileName.Strings[i - 1]);
Attachments^.ulReserved := 0;
Attachments^.flFlags := 0;
{ Position has to be -1, please see the WinApi Help
for details. }
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);

{ Now we have to process the error messages. There are some
defined in the MAPI unit please take a look at the unit to get
familiar with it.
I decided to handle USER_ABORT and SUCCESS as special and leave
the rest to fire the "new" error event defined at the top (as
generic error)

Not treated as special:
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
{ Finally we do the cleanups, the message should be on its way }
FreeMem(Recipients, MapiMessage.nRecipCount * sizeof(TMapiRecipDesc));
end;
end;

{
Please treat this as free. If you improve the component
I would be glad to get a copy.
}

end.