activePDF Toolkit是一個可擴展的可編程的COM組件，它可以幫助用戶創建和管理PDF文件。該工具箱具有強大功能的API，使得對PDF文件管理的任何自動化操作成為可能，比如用戶可以進行追加，印戳，縫合，合并，噴繪，填充表格等一系列操作。

上一章教程給出的是在PDF中添加批注的代碼示例，本次教程將要說明的是如何導出批注。

》》》下載activePDF Toolkit試用版

示例代碼如下：

// Copyright (c) 2013 activePDF, Inc.
// Example created 01/06/13

// Make sure to add the activePDF product .NET DLL(s) to your application.
// .NET DLL(s) are typically found in the products 'bin' folder.

class Examples
{
  public void main()
  {
    string strPath;
    int intOpenOutputFile;
    int intOpenInputFile;
    int intCopyForm;
    string strXMLData;
    
    strPath = AppDomain.CurrentDomain.BaseDirectory;

    // Instantiate Object
    APToolkitNET.Toolkit oTK = new APToolkitNET.Toolkit();
    
    // This example will take a PDF and add a comment to it
    // then it will extract the comment from the new PDF
    
    // Create the new PDF file
    intOpenOutputFile = oTK.OpenOutputFile(strPath + "new.pdf");
    if (intOpenOutputFile != 0)
    {
      ErrorHandler("OpenOutputFile", intOpenOutputFile);
    }
    
    // Open the template PDF
    intOpenInputFile = oTK.OpenInputFile(strPath + "PDF.pdf");
    if (intOpenInputFile != 0)
    {
      ErrorHandler("OpenInputFile", intOpenInputFile);
    }
    
    // Add a comment to first page of the input PDF
    oTK.AddComment(72.0f, 660.0f, 144.0f, 100.0f, "Lorem Ipsum", "Test", 0, 128, "#BEBEBE", true, 1, "John Doe", "Lorem");
    
    // Copy the template (with any changes) to the new file
    intCopyForm = oTK.CopyForm(0, 0);
    if (intCopyForm != 1)
    {
      ErrorHandler("CopyForm", intCopyForm);
    }
    
    // Close the new file to complete PDF creation
    oTK.CloseOutputFile();
    // Open the PDF with a comment
    intOpenInputFile = oTK.OpenInputFile(strPath + "new.pdf");
    if (intOpenInputFile != 0)
    {
      ErrorHandler("OpenInputFile", intOpenInputFile);
    }
    
    // Extract the comments as XML Data to a variable
    // Use the strXMLData variable to handle the XML data
    strXMLData = oTK.ExportComments(0);
    
    // Close the PDF input file
    oTK.CloseInputFile();
    
    // Release Object
    oTK = null;
    
    // Process Complete
    System.Diagnostics.Debug.WriteLine("Done!");
  }
  
  // Error Handling
  public static void ErrorHandler(string strMethod, object rtnCode)
  {
    System.Diagnostics.Debug.WriteLine(strMethod + " error:  " + rtnCode.ToString());
  }
}