DocumentReaderLoadOptions Class

Visual Basic
C#
Objective-C
Java
C++

public class DocumentReaderLoadOptions

'Declaration
 
Public Class DocumentReaderLoadOptions

'Usage
 
Dim instance As DocumentReaderLoadOptions

public ref class DocumentReaderLoadOptions

The DocumentReaderLoadOptions class is used as the type for the options optional parameter passed to DocumentReader.Create.

DocumentReaderLoadOptions contain the following:

RasterCodecsInstance: Optional instance of a Leadtools.Codecs.RasterCodecs object to be used when rendering or creating thumbnails for the pages. You can pass your own initialized instance of Leadtools.Codecs.RasterCodecs to be used. The same object will then be used internally by the document reader. Otherwise, pass null (Nothing in Visual Basic) and the document reader will create and use its own version of Leadtools.Codecs.RasterCodecs when needed. Refer to DocumentReader.RasterCodecsInstance for more information on how this parameter is used by the document reader during its lifetime.
Resolution: The resolution value in dots per inch to use when loading a document that does not have a native resolution such as PDF, XPS or DOC.
Password: The password to use if the document is encrypted.
GetPasswordCallback: The password to use if the document is encrypted and no password was supplied in Password.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Forms
Imports Leadtools.Forms.DocumentReaders
Imports Leadtools.WinForms
Imports Leadtools.Forms.Ocr
Imports Leadtools.Drawing

Public Sub DocumentReaderLoadOptionsExample()
   Dim loadOptions As New DocumentReaderLoadOptions()
   ' Load at 200 DPI
   loadOptions.Resolution = 200
   ' Use a new RasterCodecs
   loadOptions.RasterCodecsInstance = Nothing
   ' Set the callback to use if the document is encrypted
   loadOptions.GetPasswordCallback = New DocumentReaderGetPasswordCallback(AddressOf MyGetPasswordCallback)
   Dim documentFileName As String

   Using dlg As New OpenFileDialog()
      If dlg.ShowDialog() <> System.Windows.Forms.DialogResult.OK Then
         Return
      End If

      documentFileName = dlg.FileName
   End Using

   ' Load the document
   Dim reader As DocumentReader = DocumentReader.Create(documentFileName, loadOptions)

   ' If the value of reader is Nothing, then the document was encrypted and the user hit cancel
   ' for the dialog
   If IsNothing(reader) Then
      MessageBox.Show("Canceled")
   Else
      ' Document is loaded, show its properties
      Dim sb As New StringBuilder()
      sb.AppendFormat("Reader used: {0}\n", reader.ReaderType)
      sb.AppendFormat("MIME type: {0}\n", reader.MimeType)
      sb.AppendFormat("Document has {0} pages", reader.Pages.Count)
      MessageBox.Show(sb.ToString())

      reader.Dispose()
   End If
End Sub

Private Function MyGetPasswordCallback(ByVal fileName As String) As String
   MessageBox.Show(String.Format("{0}\nIs encrypted. Enter a password", fileName))

   ' Will simulate a password, in your application you could show a dialog box
   ' here asking the user for a pssword
   Return "lead"

   ' Or you can return Nothing, to cancel reading the document without an exception
   ' being thrown. DocumentReader.Create will return Nothing as well
End Function

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Forms;
using Leadtools.Forms.DocumentReaders;
using Leadtools.WinForms;
using Leadtools.Forms.Ocr;
using Leadtools.Drawing;

public void DocumentReaderLoadOptionsExample()
{
   DocumentReaderLoadOptions loadOptions = new DocumentReaderLoadOptions();
   // Load at 200 DPI
   loadOptions.Resolution = 200;
   // Use a new RasterCodecs
   loadOptions.RasterCodecsInstance = null;
   // Set the callback to use if the document is encrypted
   loadOptions.GetPasswordCallback = new DocumentReaderGetPasswordCallback(MyGetPasswordCallback);
   string documentFileName;

   using(OpenFileDialog dlg = new OpenFileDialog())
   {
      if(dlg.ShowDialog() != DialogResult.OK)
      {
         return;
      }

      documentFileName = dlg.FileName;
   }

   // Load the document
   DocumentReader reader = DocumentReader.Create(documentFileName, loadOptions);

   // If the value of reader is null, then the document was encrypted and the user hit cancel
   // for the dialog
   if(reader == null)
   {
      MessageBox.Show("Canceled");
   }
   else
   {
      // Document is loaded, show its properties
      StringBuilder sb = new StringBuilder();
      sb.AppendFormat("Reader used: {0}\n", reader.ReaderType);
      sb.AppendFormat("MIME type: {0}\n", reader.MimeType);
      sb.AppendFormat("Document has {0} pages", reader.Pages.Count);
      MessageBox.Show(sb.ToString());

      reader.Dispose();
   }
}

private string MyGetPasswordCallback(string fileName)
{
   MessageBox.Show(string.Format("{0}\nIs encrypted. Enter a password", fileName));

   // Will simulate a password, in your application you could show a dialog box
   // here asking the user for a pssword
   return "lead";

   // Or you can return null, to cancel reading the document without an exception
   // being thrown. DocumentReader.Create will return null as well
}

Target Platforms

Reference

DocumentReaderLoadOptions Members
Leadtools.Forms.DocumentReaders Namespace