ImageEn Forum - How to stop scan in the ImageEnMView's OnAcquireBitmap?

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How to stop scan in the ImageEnMView's OnAcquireBitmap?

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Flashcqxg

96 Posts

Posted - Oct 31 2022 : 06:50:54

Hello,i want to stop the scan in the ImageEnMView's OnAcquireBitmap,but it can not stop.
For example, I scan 100 sheets of paper. If an error is detected when scanning to the second sheet, I want to stop scanning, but the following code cannot prevent the scanner from continuing to scan. How can I stop scanning the scanner?

procedure TFrmScan.ImageEnMViewAcquireBitmap(Sender: TObject; ABitmap: TIEBitmap; DpiX, DpiY: Integer; var Handled: Boolean);
begin

if CheckError then
ImageEnMView.MIO.Aborting := True;

end;

xequte

38684 Posts

Posted - Oct 31 2022 : 20:19:33

Hi

To cancel scanning:

ImageEnMView1.MIO.AcquireParams.Aborting := True;

https://www.imageen.com/help/TIEAcquireParams.Aborting.html

Nigel
Xequte Software
www.imageen.com

Flashcqxg

96 Posts

Posted - Nov 01 2022 : 19:05:16

Hi:
My code:

procedure TFrmScan.ImageEnMViewAcquireBitmap(Sender: TObject; ABitmap: TIEBitmap; DpiX, DpiY: Integer; var Handled: Boolean);
begin
  if CheckError then
  begin
    ImageEnMView.MIO.AcquireParams.Aborting := True;
    ShowMessage('there are errors !');
  end;
end;

but the scanner will scan all the paper!

xequte

38684 Posts

Posted - Nov 01 2022 : 20:27:40

If Aborting is set in OnAcquireBitmap it will still add the current image to the MView. To avoid this set:

Handled := True;

Nigel
Xequte Software
www.imageen.com

Flashcqxg

96 Posts

Posted - Nov 02 2022 : 21:39:33

Hello:
my code:


procedure TFrmScan.ImageEnMViewAcquireBitmap(Sender: TObject; ABitmap: TIEBitmap; DpiX, DpiY: Integer; var Handled: Boolean);
begin
  if CheckError then
  begin
    ImageEnMView.MIO.AcquireParams.Aborting := True;
    Handled := True;
    ShowMessage('there are errors !');
  end;
end;

When running this code, a dialogue window will pop up, and the scanner will not stop scanning until all the papers have been scanned. Why? I want to stop scanning when encountering errors and pop up a prompt dialog window.

xequte

38684 Posts

Posted - Nov 03 2022 : 23:16:24

Hi

Is this using a Twain or WIA driver?

Nigel
Xequte Software
www.imageen.com

Flashcqxg

96 Posts

Posted - Nov 06 2022 : 17:31:26

Hello:
I used the Twain driver.

xequte

38684 Posts

Posted - Nov 06 2022 : 18:14:11

Hmm, I cannot reproduce that here. We'll need to investigate.

Nigel
Xequte Software
www.imageen.com