Cancel Property

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Document.Writer; 
 
 
public void DocumentWriterProgressExample() 
{ 
   // Get the input and output file names to use 
   var inputFileName = Path.Combine(LEAD_VARS.ImagesDir, "test_3.docx"); 
   var outputFileName = Path.Combine(LEAD_VARS.ImagesDir, "test_multipage_DocumentWriter.pdf"); 
 
   // Show the progress dialog 
   using (var dlg = new MyProgressDialog(inputFileName, outputFileName)) 
   { 
      if (dlg.ShowDialog() == DialogResult.OK) 
         Debug.WriteLine("Done!"); 
      else 
         Debug.WriteLine("User has canceled the operation or an error occurred."); 
   } 
} 
 
// Dialog box to show the  
private class MyProgressDialog : Form 
{ 
   // Files 
   private string _inputFileName; 
   private string _outputFileName; 
 
   // The controls on the dialog 
   private Label _descriptionLabel; 
   private ProgressBar _progressBar; 
   private Button _cancelButton; 
 
   // Has the operation been canceled? 
   private bool _isCancelPending; 
   // Is the dialog working? 
   private bool _isWorking; 
 
   public MyProgressDialog(string inputFileName, string outputFileName) 
   { 
      InitializeComponent(); 
 
      _inputFileName = inputFileName; 
      _outputFileName = outputFileName; 
      _isCancelPending = false; 
      _isWorking = true; 
   } 
 
   protected override void OnLoad(EventArgs e) 
   { 
      // To keep the UI functioning, do the conversion in a separate thread 
      BeginInvoke(new MethodInvoker(DoWork)); 
 
      base.OnLoad(e); 
   } 
 
   private void DoWork() 
   { 
      DocumentWriter docWriter; 
      string operation = string.Empty; 
 
      EventHandler<DocumentProgressEventArgs> progressHandler = (object sender, DocumentProgressEventArgs e) => 
      { 
         // Update the description label progress bar 
         _descriptionLabel.Text = operation; 
         _progressBar.Value = e.Percentage; 
 
         // Check if the user clicked the Cancel button, if so, abort the operation 
         if (_isCancelPending) 
            e.Cancel = true; 
 
         Application.DoEvents(); 
      }; 
 
      // Get the number of pages 
      var codecs = new RasterCodecs(); 
      codecs.Options.RasterizeDocument.Load.Resolution = 300; 
      var pageCount = codecs.GetTotalPages(_inputFileName); 
 
      // Create the document writer 
      docWriter = new DocumentWriter(); 
 
      // Create the document 
      operation = "Creating the document..."; 
 
      // Subscribe to the progress event 
      docWriter.Progress += new EventHandler<DocumentProgressEventArgs>(progressHandler); 
      docWriter.BeginDocument(_outputFileName, DocumentFormat.Pdf); 
 
      // Add the pages 
      for (var pageNumber = 1; pageNumber <= pageCount && !_isCancelPending; pageNumber++) 
      { 
         // Load the page as SVG 
         var page = new DocumentWriterSvgPage(); 
         page.SvgDocument = codecs.LoadSvg(_inputFileName, pageNumber, null); 
 
         // Add the page, notice we will not be using image/text feature (the default) 
         operation = string.Format("Adding page {0} of {1}...", pageNumber, pageCount); 
         docWriter.AddPage(page); 
 
         // Delete the SVG 
         page.SvgDocument.Dispose(); 
      } 
 
      // Finally finish writing the PDF file on disk 
      operation = "Finishing the document..."; 
      docWriter.EndDocument(); 
 
      // Remove the progress handler 
      docWriter.Progress -= new EventHandler<DocumentProgressEventArgs>(progressHandler); 
 
      codecs.Dispose(); 
 
      // Set the dialog results based on whether the user has canceled the operation 
      if (_isCancelPending) 
         DialogResult = DialogResult.Cancel; 
      else 
         DialogResult = DialogResult.OK; 
 
      // The dialog can be closed now 
      _isWorking = false; 
 
      // We are done 
      Close(); 
   } 
 
   private void _cancelButton_Click(object sender, EventArgs e) 
   { 
      // Set the isCanceled variable to true, this will break from the 
      // progress callback and closes the dialog 
      _isCancelPending = true; 
   } 
 
   protected override void OnFormClosing(FormClosingEventArgs e) 
   { 
      // Dont allow the form to close while the callback is still working 
      // Instead, cancel the operation 
      if (_isWorking) 
         e.Cancel = true; 
 
      base.OnFormClosing(e); 
   } 
 
   private void InitializeComponent() 
   { 
      // Create the controls in this form, a text label, a progress bar and a cancel button 
      SuspendLayout(); 
 
      // Text label 
      _descriptionLabel = new Label(); 
      _descriptionLabel.Location = new Point(26, 21); 
      _descriptionLabel.Name = "_descriptionLabel"; 
      _descriptionLabel.Size = new Size(367, 23); 
      _descriptionLabel.TabIndex = 0; 
      _descriptionLabel.TextAlign = ContentAlignment.MiddleLeft; 
      _descriptionLabel.Text = "Creating final document..."; 
 
      // Progress bar 
      _progressBar = new ProgressBar(); 
      _progressBar.Location = new Point(27, 47); 
      _progressBar.Name = "_progressBar"; 
      _progressBar.Size = new Size(364, 23); 
      _progressBar.TabIndex = 1; 
 
      // Cancel button 
      _cancelButton = new Button(); 
      _cancelButton.DialogResult = DialogResult.Cancel; 
      _cancelButton.Location = new Point(172, 76); 
      _cancelButton.Name = "_cancelButton"; 
      _cancelButton.Size = new Size(75, 23); 
      _cancelButton.TabIndex = 2; 
      _cancelButton.Text = "Cancel"; 
      _cancelButton.UseVisualStyleBackColor = true; 
      _cancelButton.Click += new System.EventHandler(_cancelButton_Click); 
 
      // Add the controls 
      Controls.Add(_descriptionLabel); 
      Controls.Add(_progressBar); 
      Controls.Add(_cancelButton); 
 
      // Initialize the dialog 
      AutoScaleDimensions = new SizeF(6F, 13F); 
      AutoScaleMode = AutoScaleMode.Font; 
      CancelButton = _cancelButton; 
      ClientSize = new Size(420, 118); 
      FormBorderStyle = FormBorderStyle.FixedDialog; 
      MaximizeBox = false; 
      MinimizeBox = false; 
      Name = "MyProgressDialog"; 
      ShowInTaskbar = false; 
      StartPosition = FormStartPosition.CenterParent; 
      Text = "DocumentWriter Progress Example"; 
 
      ResumeLayout(); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}