VoyForums
[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, 7, 8, 9, [10] ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: 08:56:39 03/29/00 Wed
Author: yuriy
Subject: Re: Access violation after 30 or little more pictures
In reply to: Michel 's message, "Re: Access violation after 30 or little more pictures" on 07:04:21 03/29/00 Wed

Hi Michel

As I wrote I tested this code twise and got exeption after 27 and 32 scaning!!!!

Yuriy


> Hi Yuriy,
>
> With the code changes, do you still get the exception?
>
> Best regards,
>
> Michel
>
> > Hi Michel
> > Thank you for the fast answer!
> >
> > I changed code, as you recomended. You were correct
> > because now it works much slower but it was raised
> > after 27 or 32 times of scaning.
> >
> > The new code is here:
> > procedure TMainForm.Button1Click(Sender: TObject);
> > var
> > i, i1: Integer;
> > begin
> > i1:=0;
> > try
> > for i:= 1 to 50 do begin
> > while Fdelay do
> > Sleep(1000);
> > Fdelay := True;
> > ScanMenuClick(Sender);
> > Label3.Caption := inttoStr(i);
> > i1 := i;
> > Application.ProcessMessages;
> > Sleep(10000);
> > end;
> > except
> > Label3.Caption := 'Raising after '+inttoStr(i1);
> > end;
> > end;
> >
> > In the FormCreate I set FDelay as True and in the end
> > of OnAcquire I set it as False.
> >
> > Regards
> > Yuriy
> >
> > >
> > > Hi Yuriy,
> > >
> > > From what I can see in the code example, is it
> > > possible that you are calling ScanMenuClick before
> > the
> > > image is finished scanning? You should only call
> > > ScanMenuClick again once the TScanner.OnAcquire
> event
> > > has been triggered. With this kind of code
> structure
> > > you would need a boolean flag that you would need
> to
> > > be set in the OnAcquire event.
> > >
> > > Best regards,
> > >
> > > Michel
> > >
> > > > > In our application scaning blows up after
> scaning
> > > > some
> > > > > pictures. I tested it by adding button for loop
> > > > > scanning.
> > > > >
> > > > > After that I moved this code to your demo form
> > and
> > > I
> > > > > got the same result. In ScanMenuClick I
> commented
> > > > > calling CheckDirty because it requires using
> > > Dialog.
> > > > >
> > > > > procedure TMainForm.Button1Click(Sender:
> > TObject);
> > > > > var
> > > > > i, i1: Integer;
> > > > > begin
> > > > > i1:=0;
> > > > > try
> > > > > for i:= 1 to 50 do begin
> > > > > ScanMenuClick(Sender);
> > > > > Label3.Caption := inttoStr(i);
> > > > > i1 := i;
> > > > > Application.ProcessMessages;
> > > > > Sleep(10000);
> > > > > end;
> > > > > except
> > > > > Label3.Caption := 'Raising after
> > > '+inttoStr(i1);
> > > > > end;
> > > > > end;
> > > > >
> > > > > The program blows up in the file EnDiGraph in
> > line
> > > > 732:
> > > > >
> > > > > FBitmapHandle := CreateDibSection( FDC,
> > > > >
> > > > > Windows.PBitmapInfo(@FBitmapInfo)^,
> > > > >
> > DIB_RGB_COLORS,
> > > > >
> > Pointer(FBits),
> > > > > 0, 0);
> > > > >
> > > > >
> > > > > Best Regards
> > > > > Yuriy Gendin
> > > >
> > > > P.S. As addition
> > > >
> > > > Compiler - Delphi 4, Scanner - HP Scanjet 5200C.
> > > > I prefer to use ShouUI=False for many reasons,
> for
> > > > example program interface is not English.
> > > >
> > > > Yuriy

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

[ Contact Forum Admin ]

Forum timezone: GMT-5
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.