How can I create an Internet Explorer extension using Visual Studio and COM?

Guide to developing Internet Explorer extensions

Create a working Internet Explorer extension

Prerequisites:

• Visual Studio
• .NET Framework 4.0 or higher
• Internet Explorer

Steps:

1. Create a class library project:

   • Create a new class library project and name it "IEExtension" or your favorite name.

2. Add citation:

   • Add references to the "Interop.SHDocVw" and "Microsoft.mshtml" assemblies.

3. Create source file:

   • Create two source files: "IEAddon.cs" and "Interop.cs".

   IEAddon.cs:

   <code class="language-csharp">using System;
   using System.Collections.Generic;
   using System.Runtime.InteropServices;
   using System.Windows.Forms;
   using Microsoft.Win32;
   using mshtml;
   using SHDocVw;
   
   namespace IEAddon
   {
       [ComVisible(true)]
       [ClassInterface(ClassInterfaceType.None)]
       [Guid("D40C654D-7C51-4EB3-95B2-1E23905C2A2D")]
       [ProgId("MyBHO.WordHighlighter")]
       public class WordHighlighterBHO : IObjectWithSite, IOleCommandTarget
       {
           //... (此处省略部分代码)
       }
   }</code>

   Interop.cs:

   <code class="language-csharp">using System;
   using System.Runtime.InteropServices;
   namespace IEAddon
   {
       [ComVisible(true)]
       [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
       [Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352")]
       public interface IObjectWithSite
       {
           //... (此处省略部分代码)
       }
   }</code>

4. Create configuration form:

   • Create a new form called "HighlighterOptionsForm" that contains a TextBox (for entering search terms) and an "OK" button.

5. Configure project properties:

   • Sign the assembly with a strong key.
   • Set "Start External Program" to "iexplore.exe" in the "Debug" tab.
   • Set the "Command Line Arguments" to an external URL in the "Debug" tab.
   • Add a post-build event to register the assembly using RegAsm.exe.

6. Build and run:

   • Build the project and run it using Internet Explorer.

Usage:

• This add-on will highlight all instances of the specified word (default is "browser") in a web page using a yellow background.
• Clicking on the highlighted text will call a JavaScript function.
• To change the highlighted word, click the button, set the value in the text box and press OK.

Other information:

• The "IEAddon" class implements the "IObjectWithSite" and "IOleCommandTarget" interfaces to implement the BHO function.
• The "Interop" class defines the "IObjectWithSite" interface to support COM interop.
• The post-generation script registers the BHO in the Windows registry and Internet Explorer extensions menu.
• To disable or uninstall a BHO, use RegAsm to unregister it.

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