How to Develop Internet Explorer Extensions for IE8 and IE11?

Develop Internet Explorer extensions

Create an Internet Explorer 11 add-on

1. Create a class library project (C#, .Net Framework 4.6.1) in Visual Studio.

2. Add references to Interop.SHDocVw and Microsoft.mshtml.

3. Create the following files:

   • IEAddon.cs
   • Interop.cs
   • A form containing a text box and an OK button.

4. In IEAddon.cs:

   • Implement IObjectWithSite and IOleCommandTarget interfaces.
   • Handle document completion events to highlight specific text in a web page.
   • Add registry functions to manage add-in settings and registration.

5. In Interop.cs:

   • Define the COM interface used by the add-in.

6. In form:

   • Create a property to get/set the text to highlight.

7. In project properties:

   • Sign the assembly with a strong key.
   • Set "Start external program" to iexplore.exe.
   • Set the "Post-build event command line" to register the BHO (including manual registration using regasm and gacutil).

How add-ons work

• Traverse the DOM tree, replacing the specified text with the highlighted version.
• Adds a JavaScript function to your web page that executes when highlighted text is clicked.
• Store configuration settings in the Windows registry.

Creating an Internet Explorer 8 add-on

• Project setup: Similar to IE11 add-in, using Visual Studio 2010 and .Net Framework 4.

• File: Same as the IE11 add-in, but uncomment a line in IEAddon.cs to prevent multiple executions.

• Project properties:

  • Use gacutil.exe and RegAsm.exe for 64-bit systems.

Notes on 64-bit IE:

• Use a 64-bit compiler and registration tool (e.g. RegAsm.exe from Framework64).

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