Solved

Is this considered unmanaged code?

Posted on 2009-04-08
6
294 Views
Last Modified: 2012-05-06
I'm making use of Microsoft.Interop.Security.AzRoles.  I may catch a COMException in some locations.  Would this make some of my code considered as unmanaged?  In other words, does accessing COM related assemblies mean you are doing unmanaged code?  Seems you still get garbage collection.

Would unmanaged code be only anything using the DLLImport or unsafe blocks?

0
Comment
Question by:brettr
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 15

Assisted Solution

by:oobayly
oobayly earned 100 total points
ID: 24099639
According to this article, yes

"Code executing under the control of the runtime is called managed code. Conversely, code that runs outside the runtime is called unmanaged code. COM components, ActiveX interfaces, and Win32 API functions are examples of unmanaged code."
0
 

Author Comment

by:brettr
ID: 24099678
Don't understand.  My calls are in managed code.  The assemblies I'm calling are managed but have COM references somewhere I'm sure.  So what does that make my code?
0
 
LVL 3

Expert Comment

by:OutOfTouch
ID: 24099858
0
The Orion Papers

Are you interested in becoming an AWS Certified Solutions Architect?

Discover a new interactive way of training for the exam.

 

Author Comment

by:brettr
ID: 24099993
Thanks.  I was looking for someone to answer my specific questions in their own words rather than providing links.

I see the azman DLL as about unmanaged as calls into System.Windows.Forms namespace.   Under the hood, it calls GDI+ but we don't say our code is unmanaged.  How close to the unmanaged implementation do you have to be before it is unmanaged?  The way I see it, if everything you are writing can be cleaned up by the runtime, it is managed code. Not exactly sure where that puts DLLImport. You might reference something like the azman API but those implicit COM object instances are disposed of automatically by the runtime because of how you referenced them.  Disagreements?
0
 
LVL 5

Accepted Solution

by:
burningmace earned 250 total points
ID: 24100343
I think you're misinterpreting the way .NET handles managed and unmanaged code. Say I were to declare FindWindow using DLLImport in a C# application, then call it with a pair of string variables. The string variables are managed. The FindWindow method (see code sample) itself is actually managed. When I call the FindWindow method, the [DLLImport("user32.dll"]) part tells InteropServices to translate the contents of the method parameters to unmanaged types and call the API. The core .NET framework itself is unmanaged because it is not written in VB.NET/C#/J#, but rather an unmanaged language such as C++.

A simple analogy is PHP. In PHP you cannot call GetFileSize in kernel32.dll, but you can get the PHP interpreter to call it for you using the filesize function. When you call it, PHP translates the file name string you gave it into a char* (or similar) and calls the appropriate APIs (OpenFile, GetFileSize, etc) to find the information it needs. It then translates the result into a format that can be used as a variable within the PHP script.
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

Open in new window

0
 
LVL 3

Assisted Solution

by:OutOfTouch
OutOfTouch earned 150 total points
ID: 24103194
Okay in my own words: Your code is managed code but your code is using an Interop assembly to call into unmangaged COM code. The interop assembly itself is managed code. The underlying COM api's being called are not managed code.
0

Featured Post

Tutorials alone can't teach real engineering

So we built better training tools.

-Hands-on Labs
-Instructor Mentoring
-Scenario-Based Tests
-Dedicated Cloud Servers

All at your fingertips. What are you waiting for?

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction Hi all and welcome to my first article on Experts Exchange. A while ago, someone asked me if i could do some tutorials on object oriented programming. I decided to do them on C#. Now you may ask me, why's that? Well, one of the re…
Many of us here at EE write code. Many of us write exceptional code; just as many of us write exception-prone code. As we all should know, exceptions are a mechanism for handling errors which are typically out of our control. From database errors, t…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question