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Modal Application ?

Posted on 2000-03-10
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Last Modified: 2010-04-04
Is it possible to create a modal application ?

I have a form which accepts input from a keyboard wedge laser scanner, and processes it using keypreview, keydown etc.

The only problem I come across is if someone has clicked off the form, and my application no longer has focus, then I lose scans.

So all I need it to keep my form activated whilst it is expecting scans.  A modal application kinda sounded right, but not sure if it is possible or how.

Thanks.

Dave.
0
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Question by:dmcqueen
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16 Comments
 
LVL 5

Expert Comment

by:TheNeil
ID: 2604290
Could you try adding a timer and get it to check if your app is active or not? If it ISN'T active when the timer fires then it makes your app active.

i.e.

IF NOT(Active)
THEN
  BringToFront;

An alternative would be to catch when the form becomes deactivated and then just use BringToFront again.

WIndows will probably stop you from modally running your app but I'm not an expert on that so 24000 people will now tell me I'm wrong.

The Neil
0
 
LVL 13

Expert Comment

by:Epsylon
ID: 2604316
Try this:

procedure TForm1.Deactivated(Sender: TObject);
begin
  SetForegroundWindow(Handle);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnDeactivate := Deactivated;
end;
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 2604351
maybe also try this


unit Unit1;

interface

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

type
  TForm1 = class(TForm)
  private
    Procedure WMKillFocus(var Msg : TMessage); message WM_KILLFOCUS;
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

Procedure TForm1.WMKillFocus(var Msg : TMessage);
begin
  inherited;
  SetForeGroundWindow(self.Handle);
end;

end.

meikl
0
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LVL 17

Expert Comment

by:inthe
ID: 2605597
Hi
you could use form1 as a splash screen form and on  a timer call

form1.hide;{hide splash form}
form2.showmodal; {show modal app}
0
 
LVL 12

Expert Comment

by:rwilson032697
ID: 2606354
Listening
0
 
LVL 20

Expert Comment

by:Madshi
ID: 2607254
I think you should handle the message WM_ACTIVATE or WM_ACTIVATEAPP. Don't know, perhaps Epsylon's suggestion does that already.
0
 
LVL 4

Expert Comment

by:Radler
ID: 2620596
A dumb solution;

1 - Make a full screem form, with stay on top
2 - copy the background image, grats to some E-E
use this at onCreate
SetWindowPos(Handle,hwnd_TopMost,Left,Top,Width,Height,swp_NoRedraw+swp_ShowWindow);
3 - Make the desired form and put over the last ( stay on top too )
4 - Avoid ALT-TAB, etc with
SystemParametersInfo(SPI_SCREENSAVERRUNNING, LongWord(True), @LongNum, 0);

I accept opinions.

T++, Radler.
0
 
LVL 13

Accepted Solution

by:
Epsylon earned 400 total points
ID: 2625269
>Sigh<

Try this:

procedure TForm1.Deactivated(Sender: TObject);
begin
  SetForegroundWindow(Handle);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnDeactivate := Deactivated;
end;


0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 2625534
clever, eps ;-)
0
 
LVL 13

Expert Comment

by:Epsylon
ID: 2625735
I have more than 10 questions open, waiting for a response. I'm not going to wait forever.....
0
 
LVL 12

Expert Comment

by:rwilson032697
ID: 2625851
As an aside Epsylon, how do you tell how many open Q's you have (apart from counting them manually...)?
Cheers,

Raymond.
0
 
LVL 13

Expert Comment

by:Epsylon
ID: 2625996
I have 19 notification emails here from 19 different questions. I have marked them and throw them away when the question's answer is accepted. 4 of them are from this week. Another 3 or 4 I did not answer. I'm there are more question but they slipped between my  fingers because I never got a notification from them. And a few weeks ago I missed a dozen notifications because of a stupid mistake of my provider.

Btw: did you receive your gift? I have not seen anything yet. And you, Meikl?
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 2626621
hi eps,

have ordered the gift some weeks ago,
but it didn't received me until yet :-(

meikl
0
 
LVL 17

Expert Comment

by:inthe
ID: 2626948
no gift yet for me neither :-( boo hoo
the march e.e letter says they will start shipping this month ..
0
 
LVL 12

Expert Comment

by:rwilson032697
ID: 2630347
I haven't received mine either yet.

Cheers,

Raymond.
0
 
LVL 1

Expert Comment

by:chengjian
ID: 2648019
set mainform.formstyle to fsStayOnTop?
0

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