VintaSoft Twain .NET SDK Discussions

Hello Bill,

Your code has logical mistake - you should use "while" statement instead of the "if" when you work with AcquireModal method. Here is correct code:

try
{
  vsTwain1.StartDevice();
  vsTwain1.ShowUI = false;
  if (vsTwain1.SelectSource())
  {
    vsTwain1.DisableAfterAcquire = true;
    vsTwain1.MaxImages = 1;
    vsTwain1.AutoCleanBuffer = true;
    vsTwain1.OpenDataSource();
    vsTwain1.PixelType = PixelType.BW;
    if (vsTwain1.FeederPresent)
    {
       vsTwain1.FeederEnabled = true;
       vsTwain1.AutoFeed = true;
       vsTwain1.XferCount = 1;
       vsTwain1.PdfMultiPage = false;
       if (vsTwain1.FeederLoaded)
       {
          vsTwain1.ShowIndicators = true;
          //if (vsTwain1.AcquireModal()) - wrong code
          while (vsTwain1.AcquireModal()) - correct code
          {
             try
             {
                this.Cursor = Cursors.WaitCursor;
                MemoryStream mem = new MemoryStream();
                mem = vsTwain1.GetImageAsStream(0, ImageFileFormat.PDF);
                string dirPath = "\\\\192.168.254.5\\RelatedDocuments\\EmployerDocuments\\" + myController.CurrentEmployer.Office + "\\";
                string dateString = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString("00") + DateTime.Now.Day.ToString("00");
                string filePath = myController.CurrentEmployer.EmployerId + dateString + ".pdf";
                myController.SaveScannedRecord(Int32.Parse(ScanItemTypeComboBox.SelectedValue.ToString()), filePath);
                vsTwain1.SaveImage(0, dirPath + filePath);
             }
             catch (TwainException ex)
             {
                MessageBox.Show(ex.Message);
             }
        }
        vsTwain1.StopDevice();
        MessageBox.Show("Scan completed.");
    }
  }
}

Best regards, Alexander

Do I need to set the MaxImages property to the number of pages being scanned? Yes, you should set the MaxImages property if you want to store pages in the internal buffer of the library but make sure that you have enough memory. The best way is to store images in the MemoryStream or file.

I tried this but got a attempted to divide by zero error

vsTwain1.StartDevice();
vsTwain1.ShowUI = false;
if (vsTwain1.SelectSource())
{
vsTwain1.DisableAfterAcquire = true;
vsTwain1.MaxImages = Int32.Parse(NumberOfPagesTextBox.Value.ToString());
vsTwain1.AutoCleanBuffer = true;
vsTwain1.OpenDataSource();
vsTwain1.PixelType = PixelType.BW;
if (vsTwain1.FeederPresent)
{
vsTwain1.FeederEnabled = true;
vsTwain1.AutoFeed = true;
vsTwain1.XferCount = 1;
vsTwain1.PdfMultiPage = false;
if (vsTwain1.FeederLoaded)
{
vsTwain1.ShowIndicators = true;
int pageCount = 0;
this.Cursor = Cursors.WaitCursor;
MemoryStream mem = new MemoryStream();
while (vsTwain1.AcquireModal())
{
try
{
mem = vsTwain1.GetImageAsStream(pageCount, ImageFileFormat.PDF);
pageCount++;
}
catch (TwainException ex)
{
if (vsTwain1.ErrorCode != Vintasoft.Twain.ErrorCode.None)
MessageBox.Show(vsTwain1.ErrorString);
else
MessageBox.Show(ex.Message);
}
}
string dirPath = "q:\\JobSiteDocuments\\" + myController.CurrentJobSite.Office + "\\";
string dateString = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString("00") + DateTime.Now.Day.ToString("00");
RelatedDocumentType rdType = (RelatedDocumentType)ScanItemTypeComboBox.SelectedItem;
string docDesc = rdType.DocumentTypeDesc;
string filePath = myController.CurrentJobSite.JobSiteId + docDesc + dateString + ".pdf";
Int32 numOfPages = Int32.Parse(NumberOfPagesTextBox.Value.ToString());
myController.SaveScannedRecord(Int32.Parse(rdType.DocumentTypeId.ToString()), filePath, DescriptionTextBox.Text.ToString(), numOfPages);
vsTwain1.SaveImage(0, dirPath + filePath);
vsTwain1.StopDevice();
MessageBox.Show("Scan completed.");
}
}
}
DescriptionTextBox.Text = string.Empty;
NumberOfPagesTextBox.Value = 1;
PopulateDocumentsGrid();
this.Cursor = Cursors.Arrow;

Hello Bill,
Well I have it now scanning multiple pages and creating only one pdf file but it always only saves the last page. What scanner do you have? Maybe Brother?

Please read this topic:
https://www.vintasoft.com/forums/viewtopic.php?f=19&t=3

Best regards, Alexander