Solved

Trigger events

Posted on 1999-01-24
3
165 Views
Last Modified: 2010-04-06
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
0
Comment
Question by:sergio_2001
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 17

Accepted Solution

by:
inthe earned 50 total points
ID: 1363110
Hi,
i ask this last week :-)
Set your Timer to 1800000
then it will fire every 30 minutes
Regards Barry
0
 
LVL 17

Expert Comment

by:inthe
ID: 1363111
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
 
LVL 1

Expert Comment

by:Oli2
ID: 1363112
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

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …
Suggested Courses
Course of the Month4 days, 21 hours left to enroll

635 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question