Shell Icon Overlay (C#)

Question

I need a method to create Icon Overlay\'s for Folders and Files in Windows XP/Vista, using C# or C++? Any examples?

Thanks, -Sean!

Answer 1

Tigris' TortoiseSVN product heavily uses icon overlays provided by library shared by several Tortoise products, the overlays themselves are written in C++ rather than C#.

The documentation for the TortoiseOverlays project explains how they use it and the problems they have encountered (username: guest, empty password), and the GPL'ed sourcecode is in the Subversion repository (same username/password as above).

Snippit from documentation:

TortoiseOverlays registers itself with the explorer to handle the nine states mentioned above, i.e. it registers nine overlay handlers. The explorer process initializes the TortoiseOverlays handler, calling its IShellIconOverlayIdentifier::GetOverlayInfo(). TortoiseOverlays looks for the registered overlay handlers under HKLM\Software\TortoiseOverlays\Statusname and calls their GetOverlayInfo() method so they can initialize too (Note that any change to the icon name, index, ... your handler does are overwritten later and won't be used - it's TortoiseOverlays that handles the icons now). After the initialization, TortoiseOverlays relays every call to its IShellIconOverlayIdentifier::IsMemberOf() method to the other handlers. The first handler that returns S_OK determines whether the icon is shown or not.