Forum 'VintaSoft Twain ActiveX Discussions'

Greetings,

My application needs to "listen" for scans. Each time the user inserts a check into the scanner (Fujitsu 6130 ADF) it should automatically start the scan and save the check to a file with a unique name.

Currently I use a timer with the native transfer mode:

procedure TfmCheckScan.tmFeederLoadedTimer(Sender: TObject);
begin
  tmFeederLoaded.Enabled := False;
  Application.ProcessMessages;
  if VSTwain1.FeederLoaded = 1 then
      VSTwain1.Acquire;
  else
     tmFeederLoaded.Enabled := True;
end;

I save the file and reset the timer in PostScan. Two problems -- 1) every 5 scans or so it takes over a minute for the scanner to scan, then the next scan it works fine; 2) there is a memory leak.

I would like to try AcquireModal, as it seems to be more appropriate, but I am confused as to whether it will "wait" for a document to be inserted in the scanner or if it will return an error if there is no document.

Could you provide me with a code snippet showing the preferred method for my needs? I do not need to display anything on screen and I do not want a UI. I tried setting the transfer format to File, but it will only create the first image and even though the scanner scans subsequent images, it never returned TRUE for FeederLoaded.

Alexander,

I will get you that information. Could you answer my question about AquireModal? If I start a while loop, will it wait until a page is placed in the feeder or will it generate an error and exit the loop if there is no page in the feeder? When I execute Acquire and a page is not in the feeder it just locks up the application. If AquireModal will "wait" until a page is loaded in the feeder, then I would like to give that a try first as it will greatly simplify my code and may rectify the problem. Thanks!