Sending Mail using Thread

unit uSMTPMailer;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, 
  Dialogs, IdMessage, IdBaseComponent, IdComponent, IdTCPConnection,
  IdTCPClient, IdMessageClient, IdSMTP, StdCtrls;

type
  TSendMail = class(TThread)
  private
    FPortNumber: Integer;
    FSubject: String;
    FPassword: String;
    FServerName: String;
    FFromAddress: String;
    FBodyMessage: TStrings;
    FRecipientsList: TStrings;
    procedure SetBodyMessage(const Value: TStrings);
    procedure SetFromAddress(const Value: String);
    procedure SetPasword(const Value: String);
    procedure SetPortNumber(const Value: Integer);
    procedure SetRecipientsList(const Value: TStrings);
    procedure SetServerName(const Value: String);
    procedure SetSubject(const Value: String);
  public
    constructor Create(ASuspended: Boolean);
    property PortNumber: Integer read FPortNumber write SetPortNumber;
    property ServerName: String read FServerName write SetServerName;
    property Password: String read FPassword write SetPasword;
    property FromAddress: String read FFromAddress write SetFromAddress;
    property Recipients: TStrings  read FRecipientsList write SetRecipientsList;
    property Subject: String read FSubject write SetSubject;
    property Body: TStrings read FBodyMessage write SetBodyMessage;
    procedure SendEMail;
  protected
    procedure Execute;  override;
  end;

  function SendSMTPMail(APort: Integer;
                        ASMTPServer, APassword, AFromAddress: String;
                        AToAddresses, ABodyText: TStrings): Boolean;

implementation

{ TSendMail }
constructor TSendMail.Create(ASuspended: Boolean);
begin
  inherited Create(ASuspended);
  FreeOnTerminate := True;
  FBodyMessage := TStringList.Create;
  FRecipientsList := TStringList.Create;
end;

procedure TSendMail.Execute;
var
  FIdSMTP: TIdSMTP;
  FIdMessage: TIdMessage;
begin
  FIdSMTP := TIdSMTP.Create(nil);
  FIdMessage := TIdMessage.Create(nil);
  try
    FIdSMTP.Host := FServerName;
    FIdSMTP.Port := FPortNumber;
    FIdSMTP.Password:= FPassword;
    FIdMessage.From.Address := FFromAddress;
    FIdmessage.Recipients.Assign(FRecipientsList);
    FIdMessage.Subject := FSubject;
    FIdMessage.Body.Assign(FBodyMessage);
    try
      FIdSMTP.Connect;
      FIdSMTP.Send(FIdMessage);
    except end;
  finally
    if FIdSMTP.Connected then FIdSMTP.Disconnect;
    FreeAndNil(FIdMessage);
    FreeAndNil(FIdSMTP);
  end;
end;

procedure TSendMail.SendEMail;
begin
  Resume;
end;

procedure TSendMail.SetBodyMessage(const Value: TStrings);
begin
  FBodyMessage.Assign(Value);
end;

procedure TSendMail.SetFromAddress(const Value: String);
begin
  FFromAddress := Value;
end;

procedure TSendMail.SetPasword(const Value: String);
begin
  FPassword := Value;
end;

procedure TSendMail.SetPortNumber(const Value: Integer);
begin
  FPortNumber := Value;
end;

procedure TSendMail.SetRecipientsList(const Value: TStrings);
begin
  FRecipientsList.Assign(Value);
end;

procedure TSendMail.SetServerName(const Value: String);
begin
  FServerName := Value;
end;

procedure TSendMail.SetSubject(const Value: String);
begin
  FSubject := Value;
end;

function SendSMTPMail(APort: Integer; ASMTPServer, APassword,
  AFromAddress: String; AToAddresses, ABodyText: TStrings): Boolean;
begin
  try
    with TSendMail.Create(True) do
    begin
      PortNumber := APort;
      ServerName := ASMTPServer;
      Password   := APassword;
      FromAddress := AFromAddress;
      Recipients.Assign(AToAddresses);
      Body.Assign(ABodyText);
      SendEMail;
      {no need to free, its a self destructive thread}
    end;
    Result := True;
  except
    Result := False;
  end;
end;

end.

Display a shaded column like Windows Explorer in XP

The Windows Explorer in XP displays the sorted column in pale grey. We can bring up similar behaviour in Delphi TListView by handling all two OnCustomDraw, OnColumnClick events to display a list view with a specified column shaded in pale grey.

procedure TForm1.ListView1ColumnClick(Sender: TObject; Column: TListColumn);
begin
  FColumnToSort := Column.Index;
  ListView1.Invalidate;
end; 

procedure TForm1.ListView1CustomDraw(Sender: TCustomListView; const ARect: TRect; var DefaultDraw: Boolean);
var
  ColLeft: Integer;   
  ColBounds: TRect;
  I: Integer;      
begin
  ColLeft := ARect.Left;
  for I := 0 to Pred(FColumnToSort) do
    ColLeft := ColLeft + ListView_GetColumnWidth(ListView1.Handle, I);

  ColBounds := Rect(ColLeft, ARect.Top, ColLeft + ListView_GetColumnWidth(ListView1.Handle, FColumnToSort), ARect.Bottom);

  ListView1.Canvas.Brush.Color := clSilver;
  ListView1.Canvas.FillRect(ColBounds);
end;