Implementing Global Injection and Hooking in Windows

A couple of weeks ago, Windhawk, the customization marketplace for Windows programs, was released. You can read the announcement for more details and for the motivation behind creating it. In this post, I’ll focus on my journey in implementing the technical aspects of Windhawk. If you prefer reading code to reading text, check out the demo implementation.

Windhawk allows creating mods, which are C++ snippets that are compiled to DLLs and loaded in third party programs to customize them. The technical challenge is to be able to load these DLLs in the context of the required processes. For example, one can create a mod that hooks the MessageBoxW WinAPI function, and define that the mod should apply to all processes.

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