WiaException Class

using Leadtools; 
using Leadtools.Wia; 
 
       
public void WiaExceptionExample(IntPtr parent) 
{ 
   WiaSession wiaSession = null; 
 
   try 
   { 
      if (!WiaSession.IsAvailable(WiaVersion.Version1)) 
      { 
         Console.WriteLine("WIA version 1.0 not installed."); 
         return; 
      } 
 
      // initialize a new WIA wiaSession 
      wiaSession = new WiaSession(); 
      wiaSession.Startup(WiaVersion.Version1); 
 
      DialogResult res = wiaSession.SelectDeviceDlg(parent, WiaDeviceType.Default, WiaSelectSourceFlags.NoDefault); 
      if (res != DialogResult.OK) 
      { 
         Console.WriteLine("Error selecting WIA device."); 
         wiaSession.Shutdown(); 
         return; 
      } 
 
      // acquire a page, if paper jam, allow the user to retry 
      bool done = false; 
      while (!done) 
      { 
         try 
         { 
            wiaSession.AcquireEvent += new EventHandler<WiaAcquireEventArgs>(wiaSession_AcquireEvent2); 
 
            res = wiaSession.Acquire(parent, null, WiaAcquireFlags.ShowUserInterface | WiaAcquireFlags.UseCommonUI); 
            Console.WriteLine("Success"); 
            done = true; 
 
            wiaSession.AcquireEvent -= new EventHandler<WiaAcquireEventArgs>(wiaSession_AcquireEvent2); 
         } 
         catch (WiaException ex) 
         { 
            if (ex.Code == WiaExceptionCode.PaperJam) 
            { 
               if (MessageBox.Show("Paper jam.  Fix and retry?", "WIA", MessageBoxButtons.YesNo) == DialogResult.No) 
                  done = true; 
            } 
            else 
            { 
               // other error, propagate 
               throw ex; 
            } 
         } 
      } 
   } 
   catch (WiaException ex) 
   { 
      Console.WriteLine(string.Format("WIA error:{0}Code: {1}{0}Message: {2}", Environment.NewLine, ex.Code, ex.Message)); 
   } 
   catch (Exception ex) 
   { 
      Console.WriteLine(string.Format("Other error: Message:{0}", ex.Message)); 
   } 
   finally 
   { 
      if (wiaSession != null) 
         wiaSession.Shutdown(); 
   } 
} 
 
void wiaSession_AcquireEvent2(object sender, WiaAcquireEventArgs e) 
{ 
   Application.DoEvents(); 
 
   if (e.Image != null) 
      e.Image.Dispose(); 
 
   e.Cancel = false; 
}