Trigger events

Hi All,

What's the best way to trigger one event at any 30 minutes
(7:00,7:30,...12:00,12:30 and so on) using TTimer.
Any code or another one component will be welcome.

Regards
Paulo
sergio_2001Asked:
Who is Participating?
 
intheConnect With a Mentor Commented:
Hi,
i ask this last week :-)
Set your Timer to 1800000
then it will fire every 30 minutes
Regards Barry
0
 
intheCommented:
here is a prog i did to get a screencapture every 30 minutes:
set timer to 1800000

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Timer1: TTimer;
    Image1: TImage;
    procedure Button1Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  y:Integer;
  x:String;
  implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
Timer1.Enabled:=True;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
VAR
DC:HDC;
Bmp:TBitmap ;
begin
Image1.Picture.Free;
Inc(y);
x:=IntToStr(y);
Timer1.Enabled:=False;
DC:=getDC(GetDeskTopWindow);
Bmp:=TBitmap.Create;
Bmp.Width:=Screen.Width;
Bmp.Height:=Screen.Height;
BitBlt(Bmp.Canvas.Handle,0,0,Screen.Width,Screen.Height,DC,0,0,SRCCOPY);
Image1.Picture.Bitmap:=Bmp;
ReleaseDC(DC,DC);
Bmp.Free;
Image1.Picture.SaveToFile('C:\DCSC'+x+'.BMP');
Sleep(5000);
Timer1.Enabled:=True;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
y:=1;
end;

end.
0
 
Oli2Commented:
Instead of setting the TTimer component's interval to 1800000, you could also set it to
1000 ( one second ) and check the current time.
store the starttime in a var, then check, if the current time is more than 30 minutes past the starttime. if so, do your thing and reinitialize the starttime with the current time, so it will get fired again 30 minutes later.

Greetings, Oli
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.