unit uMain;

interface

{$I IMI.INC}

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, ExtendedMAPI, ComCtrls;

type
  TfrmMain = class(TForm)
    Panel1: TPanel;
    btLogOff: TButton;
    MessageListView: TListView;
    StatusBar: TStatusBar;
    rgFolders: TRadioGroup;
    btCreateMsg: TButton;
    procedure btLogOffClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure MessageListViewData(Sender: TObject; Item: TListItem);
    procedure MessageListViewDblClick(Sender: TObject);
    procedure rgFoldersClick(Sender: TObject);
    procedure btCreateMsgClick(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private declarations }
    MAPISession: IMAPISession;
    MsgStore: IMsgStore;
    Inbox: IMAPIFolder;
    SentBox: IMAPIFolder;
    DraftBox: IMAPIFolder;
    procedure LoadInboxMessages;
    procedure LoadSentItemsMessages;
    procedure LoadDraftItems;
    procedure ReleaseAll;
  public
    { Public declarations }
  end;

var
  frmMain: TfrmMain;

implementation

uses IMIEMTypes, MAPISessionUtils, MAPIFldUtils, MAPIMsgUtils, MessageFrm,
  NewMessageFrm;

{$R *.dfm}

const
  strLogOff: array [Boolean] of string = ('Log On', 'Log Off');

var
  MsgHeadList: TMsgHeadList = nil;
  MsgHeadListCount: Integer = 0;

procedure TfrmMain.btCreateMsgClick(Sender: TObject);
var
  MAPIMessage: IMessage;
begin
  if rgFolders.ItemIndex <> 2 then
    rgFolders.ItemIndex := 2;
  if not Assigned(DraftBox) then
    Exit;

  // Create a new message in Draft items folder
  MAPIMessage := CreateMapiMessage(DraftBox);
  if not Assigned(MAPIMessage) then
    Exit;

  try
    with TfrmNewMsg.Create(Self) do
    begin
      SetMAPIObjects(MAPISession, MsgStore, DraftBox, MAPIMessage);
      ShowModal;
      Free;
    end;
  finally
    MAPIMessage := nil;
  end;

  // refresh a Draft Items
  LoadDraftItems;
end;

procedure TfrmMain.btLogOffClick(Sender: TObject);
begin
  if btLogOff.Tag = 0 then
  // Log On
  begin
    // Get MAPI Session
    MAPISession := GetMAPISession(Self.Handle, '', MAPI_LOGON_UI);
    // Get default message store for current MAPI/Outlook profile
    MsgStore := GetDefaultStore(MAPISession);
    // Get InBox, SentBox or DraftBox
    rgFoldersClick(Self);
  end
  else
  // Log Off
  begin
    // Clear all MAPI Interfaces
    ReleaseAll;
    // Close and clear MAPI Session
    ReleaseMapiSession(MAPISession);
  end;
  btLogOff.Tag := Integer(Assigned(MAPISession));
  btLogOff.Caption := strLogOff[Bool(btLogOff.Tag)];
end;

procedure TfrmMain.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  // Clear all MAPI Interfaces
  ReleaseAll;
  // Close and clear MAPI Session
  ReleaseMapiSession(MAPISession);
end;

procedure TfrmMain.FormCreate(Sender: TObject);
begin
{$IF DEFINED (WIN64)}
  Self.Caption := Self.Caption + ' - WIN64';
{$ELSE}
  Self.Caption := Self.Caption + ' - WIN32';
{$IFEND}
  MessageListView.Items.Count := 0;
end;

procedure TfrmMain.LoadInboxMessages;
begin
  // Get Inbox
  if not Assigned(Inbox) then
    Inbox := GetInbox(MsgStore);
  // Get list of messages
  MsgHeadList := GetMessageList(Inbox);

  MsgHeadListCount := Length(MsgHeadList);
  StatusBar.SimpleText := 'Message Count: ' + IntToStr(MsgHeadListCount) + ' in Inbox';

  // Force virtual ListView to render items
  MessageListView.Items.Count := MsgHeadListCount;
  MessageListView.Refresh;
end;

procedure TfrmMain.LoadSentItemsMessages;
begin
  // Get Sent items
  if not Assigned(SentBox) then
    SentBox := GetSentBox(MsgStore);
  // Get list of messages
  MsgHeadList := GetMessageList(SentBox);
  MsgHeadListCount := Length(MsgHeadList);
  StatusBar.SimpleText := 'Message Count: ' + IntToStr(MsgHeadListCount) + ' in Sent items';

  // Force virtual ListView to render items
  MessageListView.Items.Count := MsgHeadListCount;
  MessageListView.Refresh;
end;

procedure TfrmMain.LoadDraftItems;
begin
  // Get draft items
  if not Assigned(DraftBox) then
    DraftBox := GetDefaultFolder(MsgStore, oFolderDrafts, True, False);

  // Get list of messages
  MsgHeadList := GetMessageList(DraftBox);
  MsgHeadListCount := Length(MsgHeadList);
  StatusBar.SimpleText := 'Message Count: ' + IntToStr(MsgHeadListCount) + ' in Draft items';

  // Force virtual ListView to render items
  MessageListView.Items.Count := MsgHeadListCount;
  MessageListView.Refresh;
end;

procedure TfrmMain.MessageListViewData(Sender: TObject; Item: TListItem);
begin
  // Render virtual ListView
  if Item.Index > MsgHeadListCount - 1 then
    Exit;
  Item.Caption := BoolToStr(MsgHeadList[Item.Index].HasAttachment, True);
  Item.SubItems.Add(MsgHeadList[Item.Index].Subject);
  Item.SubItems.Add(MsgHeadList[Item.Index].Sender);
  Item.SubItems.Add(DateTimeToStr(MsgHeadList[Item.Index].SentTime));
  Item.SubItems.Add(ShowCustomSize(MsgHeadList[Item.Index].Size));
end;

procedure TfrmMain.MessageListViewDblClick(Sender: TObject);
var
  MAPIMessage: IMessage;
  Index: Integer;
  isUnSent: Boolean;
begin
  if not Assigned(MessageListView.Selected) then
    Exit;
  Index := MessageListView.Selected.Index;

  // Get MAPI Message from folder by EntryID
  case rgFolders.ItemIndex of
    0:
      MAPIMessage := GetMapiMessage(Inbox, MsgHeadList[Index].ID);
    1:
      MAPIMessage := GetMapiMessage(SentBox, MsgHeadList[Index].ID);
    2:
      MAPIMessage := GetMapiMessage(DraftBox, MsgHeadList[Index].ID, False);
  end;

  if not Assigned(MAPIMessage) then
    Exit;

  // Whether the message is still a draft?
  isUnSent := Bool(MsgHeadList[Index].Flags and MSGFLAG_UNSENT);

  try
    if isUnSent and (rgFolders.ItemIndex = 2) then
      // Open a compose message
      with TfrmNewMsg.Create(Self) do
      begin
        SetMAPIObjects(MAPISession, MsgStore, DraftBox, MAPIMessage);
        ShowModal;
        Free;
      end
    else
      // open a received or sent message
      with TfrmMessage.Create(Self) do
      begin
        SetMessage(MAPIMessage);
        ShowModal;
      end;
  finally
    // clear interface
    MAPIMessage := nil;
  end;

  if (rgFolders.ItemIndex = 2) then
    // refresh a Draft Items
    LoadDraftItems;
end;

procedure TfrmMain.ReleaseAll;
begin
  MessageListView.Items.Count := 0;
  MsgHeadList := nil;
  DraftBox := nil;
  SentBox := nil;
  Inbox := nil;
  // Close message store
  ReleaseMsgStore(MsgStore);
  MsgStore := nil;
end;

procedure TfrmMain.rgFoldersClick(Sender: TObject);
begin
  if not Assigned(MAPISession) then
    Exit;
  case rgFolders.ItemIndex of
    0:
      LoadInboxMessages;
    1:
      LoadSentItemsMessages;
    2:
      LoadDraftItems;
  end;
end;

end.