RE: [aus-dotnet] DllImport

[Stephen Price]

Silly me, expecting an entirely managed code OS... :)

 

I keep forgetting about all that legacy code they need to make it all work. I didn't have much to do with coding PC's pre .Net. all my coding was on Amigas and it was shared libraries etc. Can I say that on here? Don't want to be subjected to public beatings. ;) 

 

I'll check out that ActiveDirectory namespace, I understand it to be better to use the .net way wherever possible.

 

Cheers,

Stephen

(suitably more enlightened than half hour ago)

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From: peter@xxxxxxxxxxx [mailto:peter@xxxxxxxxxxx] On Behalf Of Nick Wienholt
Sent: Monday, 30 January 2006 11:18 AM
To: dotnet@xxxxxxxxxxx
Subject: RE: [aus-dotnet] DllImport

> Is this how you access unmanaged code?

 

Yes

 

> Is that the right name for it? code outside of .net is not managed by the framework right?)

 

Yes

 

> I would have thought the framework would have had somekind of wrapper for OS level stuff. I mean it has it for accessing files and memory streams etc, why not AD?

 

The full Win32 API is huge compared to the .NET Framework – it will take a lot of versions of the Framework before the majority of Win32 is covered.  There is a new namespace - System.DirectoryServices.ActiveDirectory – that covers AD, but I don’t think it offers login services.

 

Nick Wienholt, C# MVP

 

Maximizing .NET Performance

http://www.apress.com/book/bookDisplay.html?bID=217

 

A Programmer's Introduction to C# 2.0, Third Edition

http://www.apress.com/book/bookDisplay.html?bID=454

 

Sydney Deep .NET User Group

www.sdnug.org

 

www.dotnetperformance.com

 

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From: peter@xxxxxxxxxxx [mailto:peter@xxxxxxxxxxx] On Behalf Of Stephen Price
Sent: Monday, 30 January 2006 1:50 PM
To: dotnet@xxxxxxxxxxx
Subject: [aus-dotnet] DllImport

 

I'm looking at some code to do with impersonation and a nagging question popped up (its done it before so here i am asking why).

 

Why do you use DllImport? I understand what it does... ie allows you to use methods in a dll, but what i don't quite get is why is this not part of some .net namespace? Is this how you access unmanaged code? (Is that the right name for it? code outside of .net is not managed by the framework right?) I would have thought the framework would have had somekind of wrapper for OS level stuff. I mean it has it for accessing files and memory streams etc, why not AD?

 

Seeking illumination. :)

 

Cheers,

 

Stephen

 

 

http://support.microsoft.com/default.aspx?scid=KB;en-us;q306158

 

[DllImport("advapi32.dll")]
public static extern int LogonUserA(String lpszUserName,
String lpszDomain,
String lpszPassword,
int dwLogonType,
int dwLogonProvider,
ref IntPtr phToken);
[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
public static extern int DuplicateToken(IntPtr hToken,
int impersonationLevel,
ref IntPtr hNewToken);