.NET and "hide extensions for known file types"

[Richard Rudie]

Anyone know of a proper .NET way to get the state of the user's "hide
extensions for known file types" setting? Or should I read the value
from the Registry directly
(HKCU\Software\Microsoft\Windows\CurrentVersion\Ex plorer\Advanced\HideFileExt)?

[Mattias Sjögren]

Richard,

>Anyone know of a proper .NET way to get the state of the user's "hide
extensions for known file types" setting?

I'm not sure you can call it a ".NET way", but there's a native API to
retrieve these settings called SHGetSettings (use the
SSF_SHOWEXTENSIONS flag).

http://msdn.microsoft.com/library/en...etsettings.asp
Mattias

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Mattias Sjögren [C# MVP] mattias @ mvps.org
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[Richard Rudie]

On Sat, 14 Apr 2007, Mattias Sjögren wrote:

I'm not sure you can call it a ".NET way", but there's a native API to
retrieve these settings called SHGetSettings (use the
SSF_SHOWEXTENSIONS flag).

That sounds like a better way than reading the Registry. And probably
much less hassle than IShellDispatch4::GetSetting.

I see the SHELLFLAGSTATE struct that SHGetSettings uses is a 16-bit
group of bitfields. You can't do bitfields in C# / PInvoke, can you? I
would need to declare SHGetSettings with its first parameter as "out
UInt16" and do bitwise operations on the value, yes? Like so:

UInt16 u;
SHGetSettings( out u, SSF_SHOWEXTENSIONS );
bool bShowExt = ( ( u & 0x0002 ) != 0 );

[Mattias Sjögren]

>I would need to declare SHGetSettings with its first parameter as "out
UInt16" and do bitwise operations on the value, yes?

Correct.
Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
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