Solved

Is this considered unmanaged code?

Posted on 2009-04-08
6
290 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
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
3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

 

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

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

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

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…
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

919 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

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now