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MSDN bug?

Posted on 2001-09-05
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Last Modified: 2013-12-03
i find the sample codes in MSDN, but fail to compile them, especially compiler tell me it can't find WS_EX_LAYERED) and SetlayeredWindowAttributes(), so who can help me?

// Set WS_EX_LAYERED on this window
SetWindowLong(hDlg, GWL_EXSTYLE, GetWindowLong(hDlg, GWL_EXSTYLE)|WS_EX_LAYERED);
// Make this window 70% alpha
SetLayeredWindowAttributes(hDlg, 0, (255 * 70) / 100, LWA_ALPHA);
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Question by:lutfcn
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14 Comments
 

Expert Comment

by:chandas
ID: 6459878
What version of Windows are you using. It's only available for Win2000 and beyond
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Author Comment

by:lutfcn
ID: 6459953
Win2000 professional + Visual C++ 6.0
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Expert Comment

by:chandas
ID: 6459987
MSDN says,

Windows NT/2000 or later: Requires Whistler.

If Whistler = XP then you're out of luck for the moment :-)

Regards

Senkwe
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Expert Comment

by:peterchen092700
ID: 6460154
Whister == XP.
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Expert Comment

by:chandas
ID: 6460159
hehe, got me Peter
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Expert Comment

by:robpitt
ID: 6462019
To enable use the WS_EX_LAYERED and other Win2000 specific features you need to _WIN32_WINNT to be >= 0x0500

See http://msdn.microsoft.com/library/en-us/sdkintro/hh/sdkintro/usage_8xgz.asp

You can do this from your project options (C++/preprocessor) or you could just stick a
#define _WIN32_WINNT 0x0500
at the top of the file in question.
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Expert Comment

by:chandas
ID: 6463205
I'm confused Rob, apparently the feature in question is Whistler specific according to MSDN. Not Win2000. Perhaps I read it wrong.
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Expert Comment

by:robpitt
ID: 6463266
SetlayeredWindowAttributes is implemented on Win2000 and WinXP (=Whistler).

Where does it say it needs Whistler (XP) ???
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Expert Comment

by:chandas
ID: 6463330
Then I did read it wrong.

Thanks
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Expert Comment

by:peterchen092700
ID: 6463357
I remember an MSDN edition (or was it that newletter?) that stated "Layered windows are available with Whistler" - so maybe we tapped the same trap...

Peter
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Accepted Solution

by:
robpitt earned 25 total points
ID: 6463958
PS
Also for the layered windowed stuff you need a copy of the "Platform SDK" in order to get the latest H/lib files.

VC6 ships with only the basic (3yr old) files.
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