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Detecting XP Themes

, 18 Mar 2004
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How To Detect Theme Settings in Windows XP

Sample image

Introduction

Support for XP Themes is known to be somewhat haphazard - the Explorer bypasses the theme DLL, UxTheme, for example. Microsoft refuses to open themes to developers for fear rampant new themes will cause "application incompatibilities."

I choose not to mess with UxTheme and the like, but I would like my applications to be aware when themes are in use. Because there are only four, at least right now, it is feasible to write code that reacts to the user's choice of theme. The user can choose "Windows Classic" or "Windows XP." If they choose the latter, they can select Blue (the default), Olive Green, or Silver color schemes.

[Added]

Thanks to Konrad Windszus and Rene Koenig, who point out that peeking in the registry is brittle and likely to break in future versions. That's an important disclaimer, along with this: Do not modify the registry hoping to change the theme.

I revised the code to illustrate Konrad's suggestion of calling UxTheme's IsThemeActive() method and Rene's IsAppThemed(). I still can't find an easy way to get UxTheme to tell me whether the user has chosen Blue, Green, or Silver.

Use the Registry

The answer is found in the registry, but it's not obvious. To save you experimenting, I'll just tell you:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ThemeManager

ThemeActive is "1" if Windows XP, "0" if Windows Classic.

If ThemeActive is "1", ColorName will be "NormalColor" for blue, "HomeStead" for olive green, or "Metallic" for silver. (All of these data values are type REG_SZ, or strings, by the way.)

The following C# code illustrates reading the settings. Other languages are quite similar.

using System;
using System.Runtime.InteropServices;
using Microsoft.Win32;
class Class1 { 
static void Main()

{
    Console.WriteLine("CurrentTheme returns {0}", CurrentTheme());
    Console.WriteLine("UxTheme::IsThemeActive returns {0}", IsThemeActive());
    Console.WriteLine("UxTheme::IsAppThemed returns {0}", IsAppThemed());
    Console.Read();

}
public enum Theme

{
    WindowsClassic,
    XPBlue,
    XPGreen,
    XPSilver

}
public static Theme CurrentTheme()

{
    RegistryKey key = 
        Registry.CurrentUser.OpenSubKey(
            @"Software\Microsoft\Windows\CurrentVersion\ThemeManager");
    if (key != null) 
    {
        if ("1" == (string) key.GetValue("ThemeActive"))
        {
            string s = (string) key.GetValue("ColorName");
            if (s != null)
            {
                if (String.Compare(s, "NormalColor", true) == 0)
                    return Theme.XPBlue;
                if (String.Compare(s, "HomeStead", true) == 0)
                    return Theme.XPGreen;
                if (String.Compare(s, "Metallic", true) == 0)
                    return Theme.XPSilver;
            }
        } 
    }
    return Theme.WindowsClassic;

}
[DllImport("UxTheme")]

static extern bool IsThemeActive();
[DllImport("UxTheme")]

static extern bool IsAppThemed();
}    // end Class1

References

This article was inspired by an anonymous CodeProject article on XP-style buttons: http://www.codeproject.com/cs/miscctrl/JPEnhancedXPButton.asp, based on the work of someone named Joaqs. The anonymous article adds a "BtnStyle" property for the programmer to specify Blue, Silver, or Olive, but offers no hints how to detect the current state.

History

  • 03/21/04 ad Revised
  • 03/19/04 ad Initial

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Alastair Dallas
Web Developer
United States United States
Alastair Dallas is a programmer, systems architect, and information designer with over 20 years experience at companies including Ashton-Tate, Lotus, Netscape, Documentum, and a wide variety of startups. Languages include C#, C, C++, Java, JavaScript, Perl, Python, and VB (in alphabetical order) as well as DHTML, XML, and related technologies. He has written 3 books, 2 on computer topics, and is President of Infospect Press.

Comments and Discussions

 
GeneralWM_THEMECHANGED Notification PinmemberDmex8714-Mar-10 12:38 
QuestionThe managed way? Pinmembermiloush.uam9-Feb-06 5:10 
AnswerRe: The managed way? PinmemberAsh230-Mar-06 6:22 
GeneralProblem with some visual components PinmemberCarlos Eugênio X. Torres16-Dec-05 8:05 
Generalan easier way with .net 1.1 Pinmemberbenoxoft28-Apr-05 12:51 
GeneralEasier way via IsThemeActive() PinmemberKonrad Windszus20-Mar-04 1:05 
GeneralRe: Easier way via IsThemeActive() PinmemberRene Koenig20-Mar-04 2:45 
GeneralRe: Easier way via IsThemeActive() PinmemberKonrad Windszus21-Mar-04 2:58 
GeneralRe: Easier way via IsThemeActive() PinmemberDavid Pritchard21-May-04 9:23 
GeneralInterresting! PinmemberCarl Mercier19-Mar-04 15:44 

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