Get Windows theme?

Question

I must really know which Windows theme my user is using.
More precisely, Classic, XP, Basic or Aero. (Basic theme as in Vista/7 Windows Basic theme)
I already know how to find if it's aero, but how about the others?

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The answer can be in any .NET language (C#, VB.NET or C++).

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If you really have to know why on Earth I need to know the theme then here you go:
I have some floating buttons over the caption of a form and I need to change their appearance according to the windows theme.
So far I've managed to find Aero/Classic.

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Screen shots of the result, after solving the issue:

Answer 1

You can check whether themes are active by calling IsAppThemed/IsThemeActive and then check for Aero by calling DwmIsCompositionEnabled. There may well be other ways of doing this!!

EDIT

The logic would be:

1. Can I import IsAppThemed and IsThemeActive? If no then I must be in Windows Classic (Win9x or Win2k).
2. What does IsAppThemed and IsThemeActive return? If false then I must be in Windows Classic.
3. Can I import DwmIsCompositionEnabled? If no then I must be XP themed.
4. What does DwmIsCompositionEnabled return? If true then I am Aero, otherwise I am Windows Basic.

Answer 2

You can check the registry for the current theme at:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes

under String "CurrentTheme" which has the path to the current theme. below is the code for checking it in C#.

using Microsoft.Win32;

public string GetTheme()
{
  string RegistryKey = @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes";
  string theme;
  theme = (string) Registry.GetValue(RegistryKey, "CurrentTheme", string.Empty);
  theme = theme.Split('\\').Last().Split('.').First().ToString();
  return theme;
}