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Window Theme doesn't change

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Hi guys,

I need my client window to be independent of the Windows Theme.

(since I use settings in my program that won't work in case of Aero or other themes)

So I decided to convert the needed window, before using it, to Classic theme.

I used _WinAPI_SetWindowTheme()

First of all I didn't well understood what are the arguments: _WinAPI_SetWindowTheme ( $hWnd [, $sName = 0 [, $sList = 0]] ), so reading MSDN and other examples I just used "" and "".

Anyway I realized that window doesn't change always but just sometimes. (this happens on every kind of window I use as target)

here is the code you can test, I used it with AutoIt Help window

#include <WinAPITheme.au3>
$sText = WinGetTitle("AutoIt H")
$hwnd = WinGetHandle($sText)
$answ = _WinAPI_SetWindowTheme($hwnd,"","")
If Not @error Then
    ConsoleWrite("OK - " & $sText & @CRLF & @CRLF)
    ConsoleWrite("KO - " & @extended & @CRLF& @CRLF)


My  aim is to use the client window with classic theme and independent from DPI resolution (I use 100% but maybe someone could use 125%), so I would like to applly changes before using the window.



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Tried both under W7 and W8 but still get this noisy problem.

And when I can change theme, sometimes borders/buttons are crappy and not linear.


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Hi Marco,

I have a similar problem ...

But first to your problem: could it be that there must be a short pause before applying the settings?

My problem is that I take a snapshot of a portion of a window and when someone uses 125% DPI or even 150% the metrics of the window change and the screenshot is not taken correctly. I could compensate it within the autoit script but of course setting the window strictly to 100% DPI would be a better solution.

Perhaps you can let me know when you'll have found a solution - I am also working on it (although I am not real AutoIt specialist, more a universalist like you).

Good luck!


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Hi Norbert,

that was Phase2 problem :)

infact not only i need to solve the theme-problem but also the DPI one.

What I thought to do today is the following:

set in my program settings.ini three more values:

a) Browser

B) Theme

c) DPI

when my customers create their profiles they have no problems since everything it's done in their pc.

when they use my profiles (self built in my product) I will check before running the profile the 3 conditions:

$class_string = "MozillaWindowClass"
$wclass = WinGetClassList($hwnd)
If StringInStr($wclass,$class_string) Then
    ConsoleWrite("Correct Browser" & @CRLF & @CRLF)
    ConsoleWrite("Only Firefox suitable for this profile" & @CRLF & @CRLF)


If IsArray($aData) Then
    ConsoleWrite("Only Classic Theme suitable for this profile" & @CRLF & @CRLF)
    ConsoleWrite('File:    ' & $aData[0] & @CRLF)
    ConsoleWrite('Color:   ' & $aData[1] & @CRLF)
    ConsoleWrite('Size:    ' & $aData[2] & @CRLF)
    ConsoleWrite('Name:    ' & _WinAPI_GetThemeDocumentationProperty($aData[0], $SZ_THDOCPROP_CANONICALNAME) & @CRLF)
    ConsoleWrite('Display: ' & _WinAPI_GetThemeDocumentationProperty($aData[0], $SZ_THDOCPROP_DISPLAYNAME) & @CRLF)
    ConsoleWrite('Tooltip: ' & _WinAPI_GetThemeDocumentationProperty($aData[0], $SZ_THDOCPROP_TOOLTIP) & @CRLF)
    ConsoleWrite('Author:  ' & _WinAPI_GetThemeDocumentationProperty($aData[0], $SZ_THDOCPROP_AUTHOR) & @CRLF)
    ConsoleWrite('Classic Theme' & @CRLF)


Still don't know how to get DPIs? Do you know how to find them?


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Hi again Marko,

in the meantime I found a workaround - not a real solution - for getting the DPI at least indirectly.

Try this from the helpfile folder:  _GDIPlus_ImageGetHorizontalResolution.au3

It gives the dpi from a test with a captured bitmap - means: 96 for 100%, 120 for 125% etc.

Hope it helps, although directly forcing the window to use a fixed resolution would be better.


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