[shell-coding] Changes in Windows 7 compared to Vista
- From: "Karl-Henrik Henriksson [qwilk]" <qwilk@xxxxxxxxxxx>
- To: shell-coding@xxxxxxxxxxxxx
- Date: Thu, 29 Jan 2009 00:19:21 +0100
On 14 jan 2009, at 01.25, Neil Santos wrote:
Has anybody tried Windows 7 yet? I'm anxious to find out how much
work it would take to make shell reps work flawlessly on it.
Well, I think I've found one change in Windows 7 Beta compared to
Windows Vista:
As you know, a wallpaper is (usually) set by a call to
SystemParametersInfo using the SPI_SETDESKWALLPAPER input parameter
(see http://msdn.microsoft.com/en-us/library/ms724947.aspx ). Starting
with the Windows 7 Beta, a classic old-school desktop window
("DesktopBackgroundClass") no longer seems to be "notified" of
wallpaper changes in the good old fashion way, i.e. by triggering a
regular WM_PAINT repainting of the window. However, following a call
to SystemParametersInfo, a WM_SETTINGCHANGE message is broadcasted to
all top-level windows to notify them of the change, and this can be
used to trigger the repainting of the classic desktop window. Here's
an abbreviated example:
----------
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
PaintDesktop(hdc);
EndPaint(hwnd, &ps);
}
case WM_SETTINGCHANGE:
{
if (wParam == SPI_SETDESKWALLPAPER)
{
if (operatingSystemVersion >= OSVERSION_WIN7)
InvalidateRect(hDesktopWnd, NULL, false);
}
}
----------
BR//Karl -> qwilk
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