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IDOL Keyview Filter SDK 12.6 .NET Programming Guide

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KeyView Software Version 12.6 Filter SDK .NET Programming Guide Document Release Date: June 2020 Software Release Date: June 2020 Filter SDK .NET Programming Guide Legal notices Copyright notice © Copyright 2016-2020 Micro Focus or one of its affiliates. The only warranties for products and services of Micro Focus and its affiliates and licensors (“Micro Focus”) are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. Micro Focus shall not be liable for technical or editorial errors or omissions contained herein. The information contained herein is subject to change without notice. Documentation updates The title page of this document contains the following identifying information: l Software Version number, which indicates the software version. l Document Release Date, which changes each time the document is updated. l Software Release Date, which indicates the release date of this version of the software. To check for updated documentation, visit https://www.microfocus.com/support-and-services/documentation/. Support Visit the MySupport portal to access contact information and details about the products, services, and support that Micro Focus offers. This portal also provides customer self-solve capabilities. It gives you a fast and efficient way to access interactive technical support tools needed to manage your business. As a valued support customer, you can benefit by using the MySupport portal to: l Search for knowledge documents of interest l Access product documentation l View software vulnerability alerts l Enter into discussions with other software customers l Download software patches l Manage software licenses, downloads, and support contracts l Submit and track service requests l Contact customer support l View information about all services that Support offers Many areas of the portal require you to sign in. If you need an account, you can create one when prompted to sign in. To learn about the different access levels the portal uses, see the Access Levels descriptions. KeyView (12.6) Page 2 of 255 Filter SDK .NET Programming Guide Contents Part I: Overview of Filter SDK 9 Chapter 1: Introducing Filter SDK 10 Overview 10 Features 10 Platforms, Compilers, and Dependencies 11 Supported Platforms 11 Supported Compilers 11 Software Dependencies 12 Windows Installation 12 UNIX Installation 13 Package Contents 14 License Information 15 Enable Advanced Document Readers 16 Update License Information 16 Directory Structure 17 Chapter 2: Getting Started 19 Architectural Overview 19 Enhance Performance 20 File Caching 20 Filtering 21 Subfile Extraction 21 Use the .NET Implementation of the API 21 Input/Output Operations 22 Filter in File or Stream Mode 22 Multithreaded Filtering 23 The Filter Process Model 24 Persist the Child Process 25 Run Filter In Process 26 Run File Extraction Functions Out of Process 26 Out-of-Process Logging 26 Enable Out-of-Process Logging 27 Set the Verbosity Level 27 Enable Windows Minidump 27 Keep Log Files 28 Run File Detection In or Out of Process 28 Specify the Process Type In the formats.ini File 28 Specify the Process Type In the API 29 Stream Data to Filter 29 Part II: Use Filter SDK 30 KeyView (12.6) Page 3 of 255 Filter SDK .NET Programming Guide Chapter 3: Use the File Extraction API 31 Introduction 31 Extract Subfiles 32 Sanitize Absolute Paths 33 Extract Images 34 Recreate a File's Hierarchy 34 Create a Root Node 34 Example 35 Extract Mail Metadata 36 Default Metadata Set 36 Extract the Default Metadata Set 37 Microsoft Outlook (MSG) Metadata 38 Extract MSG-Specific Metadata 39 Microsoft Outlook Express (EML) and Mailbox (MBX) Metadata 39 Extract EML- or MBX-Specific Metadata 39 Lotus Notes Database (NSF) Metadata 40 Extract NSF-Specific Metadata 40 Microsoft Personal Folders File (PST) Metadata 40 MAPI Properties 40 Extract PST-Specific Metadata 41 Exclude Metadata from the Extracted Text File 42 Extract Subfiles from Outlook Files 42 Extract Subfiles from Outlook Express Files 42 Extract Subfiles from Mailbox Files 42 Extract Subfiles from Outlook Personal Folders Files 43 Choose the Reader to use for PST Files 43 MAPI Attachment Methods 45 Open Secured PST Files 45 Detect PST Files While the Outlook Client is Running 46 Extract Subfiles from Lotus Domino XML Language Files 46 Extract Subfiles from Lotus Notes Database Files 47 System Requirements 47 Installation and Configuration 48 Windows 48 Solaris 48 AIX 5.x 48 Linux 49 Open Secured NSF Files 49 Format Note Subfiles 49 Extract Subfiles from PDF Files 50 Improve Performance for PDFs with Many Small Images 50 Extract Embedded OLE Objects 50 Extract Subfiles from ZIP Files 50 Default File Names for Extracted Subfiles 51 Default File Name for Mail Formats 51 Default File Name for Embedded OLE Objects 52 KeyView (12.6) Page 4 of 255 Filter SDK .NET Programming Guide Chapter 4: Use the Filter API 54 Generate an Error Log 54 Enable or Disable Error Logging 55 Change the Path and File Name of the Log File 55 Report Memory Errors 56 Specify a Memory Guard 56 Report the File Name in Stream Mode 56 Specify the Maximum Size of the Log File 57 Extract Metadata 57 Extract Metadata for File Filtering 58 Extract Metadata for Stream Filtering 58 Example 58 Convert Character Sets 60 Determine the Character Set of the Output Text 60 Guidelines for Character Set Conversion 60 Set the Character Set During Filtering 61 Set the Character Set During Subfile Extraction 61 Prevent the Default Conversion of a Character Set 62 Extract Deleted Text Marked by Tracked Changes 62 Filter PDF Files 63 Filter PDF Files to a Logical Reading Order 63 Enable Logical Reading Order 64 Use the API 64 Use the formats.ini File 65 Rotated Text 66 Extract Custom Metadata from PDF Files 66 Skip Embedded Fonts 67 Use the formats.ini File 67 Use the .NET API 67 Control Hyphenation 67 Filter Portfolio PDF Files 68 Filter Spreadsheet Files 68 Filter Worksheet Names 68 Filter Hidden Text in Microsoft Excel Files 68 Specify Date and Time Format on UNIX Systems 69 Filter Very Large Numbers in Spreadsheet Cells to Precision Numbers 69 Extract Microsoft Excel Formulas 70 Filter HTML Files 71 Filter XML Files 72 Configure Element Extraction for XML Documents 72 Modify Element Extraction Settings 73 Use an Initialization File 73 Modify Element Extraction Settings in the kvxconfig.ini File 73 Specify an Element's Namespace and Attribute 75 Add Configuration Settings for Custom XML Document Types 75 Configure Headers and Footers 76 KeyView (12.6) Page 5 of 255 Filter SDK .NET Programming Guide Tab Delimited Output for Embedded Tables 76 Exclude Japanese Guide Text 77 Source Code Identification 77 Chapter 5: Sample Programs 78 FilterTestDotNet 78 TestExtract 78 TestFilter 80 Appendixes 83 Appendix A: Supported Formats 84 Key to Supported Formats Table 84 Supported Formats 86 Appendix B: Document Readers 157 Key to Document Readers Table 157 Document Readers 159 Appendix C: Character Sets 188 Multibyte and Bidirectional Support 188 Coded Character Sets 196 Appendix D: Extract and Format Lotus Notes Subfiles 202 Overview 202 Customize XML Templates 202 Use Demo Templates 203 Use Old Templates 203 Disable XML Templates 203 Template Elements and Attributes 204 Conditional Elements 204 Control Elements 205 Data Elements 206 Date and Time Formats 209 Lotus Notes Date and Time Formats 209 KeyView Date and Time Formats 210 Appendix E: File Format Detection 215 Introduction 215 Extract Format Information 215 Determine Format Support 215 Example formats.ini file entries 216 Refine Detection of Text Files 216 Allow Consecutive NULL Bytes in a Text File 217 Translate Format Information 218 Distinguish Between Formats 218 Determine a Document Reader 219 Category Values in formats.ini 219 Appendix F: List of Required Files for Redistribution 223 KeyView (12.6) Page 6 of 255 Filter SDK .NET Programming Guide Core Files 223 Support Files 224 Document Readers 225 Appendix G: Develop a Custom Reader 232 Introduction 232 How to Write a Custom Reader 233 Naming Conventions 233 Basic Steps 234 Token Buffer 234 Macros 236 Reader Interface 236 Function Flow 237 Example Development of fffFillBuffer() 237 Implementation 1—fpFillBuffer() Function 237 Structure of Implementation 1 238 Problems with Implementation 1 238 Implementation 2—Processing a Large Token Stream 239 Structure of Implementation 2 240 Problems with Implementation 2 240 Boundary Conditions 240 Implementation 3—Interrupting Structured Access Layer Calls 241 Structure of Implementation 3 243 Development Tips 243 Functions 244 xxxsrAutoDet() 244 xxxAllocateContext() 245 xxxFreeContext() 246 xxxInitDoc() 247 xxxFillBuffer() 247 xxxGetSummaryInfo() 248 xxxOpenStream() 249 xxxCloseStream() 250 xxxCharSet() 250 Appendix H: Password Protected Files 252 Supported Password Protected File Types 252 Open Password Protected Container Files 253 Filter Password Protected Files 253 Send documentation feedback 255 KeyView (12.6) Page 7 of 255 Filter SDK .NET Programming Guide KeyView (12.6) Page 8 of 255 Part I: Overview of Filter SDK This section provides an overview of the Micro Focus KeyView Filter SDK and describes how to use the .NET implementation of the API. KeyView (12.6) Page 9 of 255 Chapter 1: Introducing Filter SDK This section describes the Filter SDK package. • Overview 10 • Features 10 • Platforms, Compilers, and Dependencies 11 • Windows Installation 12 • UNIX Installation 13 • Package Contents 14 • License Information 15 • Directory Structure 17 Overview Micro Focus KeyView Filter SDK enables you to incorporate text extraction functionality into your own applications. It extracts text and metadata from a wide variety of file formats on numerous platforms, and can automatically recognize over 1000 document types. It supports both file-based and stream- based I/O operations, and provides in-process or out-of-process filtering. Filter SDK is part of the KeyView suite of products.
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