Function Reference


_WinAPI_DwmRegisterThumbnail

Creates a Desktop Window Manager (DWM) thumbnail relationship between the destination and source windows

#include <WinAPIGdi.au3>
_WinAPI_DwmRegisterThumbnail ( $hDestination, $hSource )

Parameters

$hDestination Handle to the window that will use the DWM thumbnail.
$hSource Handle to the window to use as the thumbnail source.

Return Value

Success: Handle that represents the registration of the DWM thumbnail.
Failure: 0 and sets the @error flag to non-zero, @extended flag may contain the HRESULT error code.

Remarks

The window designated by $hDestination must either be the desktop window itself or be owned by the process that is calling _WinAPI_DwmRegisterThumbnail().

This function requires Windows Vista or later.

See Also

Search DwmRegisterThumbnail in MSDN Library.

Example

#include <GUIConstantsEx.au3>
#include <MsgBoxConstants.au3>
#include <WinAPIGdi.au3>

If Not _WinAPI_DwmIsCompositionEnabled() Then
    MsgBox(BitOR($MB_ICONERROR, $MB_SYSTEMMODAL), 'Error', 'Require Windows Vista or later with enabled Aero theme.')
    Exit
EndIf

Run(@SystemDir & '\calc.exe')
Local $hWnd = WinWaitActive("[CLASS:CalcFrame]", '', 3)
If Not $hWnd Then
    Exit
EndIf

; Create GUI
Local $hForm = GUICreate('Test ' & StringReplace(@ScriptName, '.au3', '()'), 400, 400)

GUISetBkColor(0)

; Create the "sheet of glass" effect for the entire window. You must call this function whenever DWM composition is toggled.
_WinAPI_DwmExtendFrameIntoClientArea($hForm)

; Create a DWM thumbnail relationship (2:1)
Local $hThumbnail = _WinAPI_DwmRegisterThumbnail($hForm, $hWnd)
Local $tSIZE = _WinAPI_DwmQueryThumbnailSourceSize($hThumbnail)
Local $iWidth = DllStructGetData($tSIZE, 1)
Local $iHeight = DllStructGetData($tSIZE, 2)
Local $tDestRect = _WinAPI_CreateRectEx((400 - $iWidth / 2) / 2, (400 - $iHeight / 2) / 2, $iWidth / 2, $iHeight / 2)
Local $tSrcRect = _WinAPI_CreateRectEx(-20, -20, $iWidth + 40, $iHeight + 40)
_WinAPI_DwmUpdateThumbnailProperties($hThumbnail, 1, 0, 255, $tDestRect, $tSrcRect)

GUISetState(@SW_SHOW)

Do
Until GUIGetMsg() = $GUI_EVENT_CLOSE

WinClose("[CLASS:CalcFrame]", "")