Problem with Windows 7

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I want to fix a transparent dialog on the desktop, I use this code for make the dialog transparent:

C++

// change opacity : 0 is transparent and 255 is opaque.
LONG ExtendedStyle = GetWindowLong( GetSafeHwnd(), GWL_EXSTYLE );
SetWindowLong( GetSafeHwnd(), GWL_EXSTYLE, ExtendedStyle | WS_EX_LAYERED );
SetLayeredWindowAttributes( 0, 150, LWA_ALPHA );

also I fix dialog on the desktop with this code:

C++

HWND ProgmanHwnd = ::FindWindowEx( ::FindWindowEx( ::FindWindow( L"Progman", L"Program Manager" ), NULL, L"SHELLDLL_DefView",L"" ), NULL, L"SysListView32", L"FolderView" ); 
::SetParent( m_hWnd, ProgmanHwnd );

I put both codes in OnCreate().

on Windows XP it works fine, but in win7 only one of them works, it means if I use both codes, the dialog will disappear, but if I comment one of them, the other one works fine.

Is there any idea about this strange problem?

Posted 29-Sep-11 0:58am

Minoo Khazeni

Updated 29-Sep-11 2:51am

Richard MacCutchan

v2

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Richard MacCutchan 29-Sep-11 8:52am

You need to explain which one fails and what results you get.

Minoo Khazeni 1-Oct-11 0:09am

I thought it's clear...
if I comment (for example) the codes related to change opacity, the second property works fine and the dialog will fix on the desktop, also if I comment the codes related to fix on the desktop, the first property will works fine and the dialog will become transparent, but if I use both of them, the dialog will disappear

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KarstenK · Answer 1 · 2011-10-05T00:55:00

Solution 1

you better check the returned values. On W7 you may not get all handles.

Check for W7 and write something what works better ;-)

Posted 5-Oct-11 0:55am

KarstenK