How to Create an Internet Explorer Extension Using a Class Library Project?

Developing an Internet Explorer Extension: A Step-by-Step Guide

This guide outlines the process of creating an Internet Explorer extension using a Class Library project in Visual Studio.

Phase 1: Project Setup

1. New Class Library: Initiate a new Class Library project within Visual Studio.
2. Essential References: Incorporate references to Interop.SHDocVw and Microsoft.mshtml libraries.

Phase 2: Implementing the Browser Helper Object (BHO)

1. Interface Implementation: Develop a class that implements the IObjectWithSite and IOleCommandTarget interfaces. (Refer to the original code example for implementation details).

Phase 3: Registry Registration with RegAsm

1. Post-Build Event: Configure a post-build event to register the BHO using RegAsm. Utilize the RegBHO and RegCmd registry keys for BHO and command registration, respectively.

Phase 4: DOM Manipulation Techniques

1. Event Handling: Override the OnDocumentComplete event of the IWebBrowser2 interface to interact with the Document Object Model (DOM) upon page load.
2. Element Insertion: Select the target text and insert it into a <span></span> element with a custom background color for highlighting.

Phase 5: Options Persistence

1. Registry Access: Employ the registry to store and retrieve user-defined highlighting text. Use IEGetWriteableHKCU for efficient registry access.

Phase 6: Command Button Integration

1. UI Development: Design a form containing a button to trigger a settings window.
2. Event Handling: Implement the button's click event to display the settings window, allowing users to customize the highlighted text.
3. Data Persistence: Save the configuration settings to the registry.

Phase 7: SQLite Database Integration (Optional)

1. NuGet Package: Include the System.Data.SQLite NuGet package to enable SQLite database functionality.
2. Database Management: Use SQLiteConnection, SQLiteCommand, and SQLiteDataReader classes to manage database connections and perform data operations.

Important Considerations:

• Developing for Internet Explorer 11 using Visual Studio 2017 might require additional, unspecified steps.
• This guide does not cover the use of Spice IE, as mentioned in the original question.

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