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New Message on BDOTNET
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From: Pooran-Prasad
Message 4 in Discussion
Hi Shaju,
Microsoft Visual Studio
.NET (VS.NET) is capable of producing both managed and unmanaged code. Basically
unmanaged code is the kind that runs directly against the Win32 API and the x86
instruction set, the kind we're used to. Managed code runs on .NET's CLR (common
language runtime), the equivalent of Java's VM.
Managed code comes in
two forms, safe and unsafe. Safe code only accesses memory that's been
previously written to, doesn't assign data to variables of the wrong type, etc.
The idea is that it's stable and secure, within the environment of the CLR.
By default, C#.NET and VB.NET both produce verifiably safe code. There
is a tool in Microsoft Visual Studio .NET called PEVerify that checks code is
verifiably safe. It is possible to produce code that's not verfiably safe by
using managed C++ or using the 'unsafe' keyword in C#. However, if that code
attempts an unsafe operation when running it will throw a VerifierException and
avert attempts at compromising security, etc.
Managed code is code that is written to target the services
of the common language runtime (see What is the Common Language Runtime?). In
order to target these services, the code must provide a minimum level of
information (metadata) to the runtime. All C#, Visual Basic .NET, and
JScript .NET code is managed by default. Visual Studio .NET C++ code
is not managed by default, but the compiler can produce managed code by
specifying a command-line switch (/CLR).
<o:p></o:p>
Though unasked, I
would like to add details on managed data. Closely related to managed
code is managed data�data that is allocated and de-allocated by the common
language runtime's garbage collector. C#, Visual Basic, and JScript .NET data is
managed by default. C# data can, however, be marked as unmanaged through the use
of special keywords.
Visual Studio .NET C++ data is unmanaged by default
(even when using the /CLR switch), but when using Managed Extensions for C++, a
class can be marked as managed by using the __gc keyword. As the name suggests,
this means that the memory for instances of the class is managed by the garbage
collector. In addition, the class becomes a full participating member of the
.NET Framework community, with the benefits and restrictions that brings. An
example of a benefit is proper interoperability with classes written in other
languages (for example, a managed C++ class can inherit from a Visual Basic
class). An example of a restriction is that a managed class can only inherit
from one base class. <o:p></o:p>
Hope that helps
:)
Have a great day :)
Pooran Prasad
R. Pooran Prasad
Itreya Technologies Pvt Ltd.,
Mail:
[EMAIL PROTECTED]
Phone(Off) :
5200179/80/81/82/83 Extn: 50
Mobile: +91 98860 29578
-----Original Message-----
From: Arian_Intellect
[mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 30, 2003
1:24 PM
To: BDOTNET
Subject: Difference Between Managed
Code and UnManaged Code
New Message on BDOTNET
Difference Between Managed Code and UnManaged
Code
Reply
Reply to Sender Recommend
Message 1 in
Discussion
From: Arian_Intellect
Hi,
Can anybody tell me the
Difference Between Managed Code and UnManaged Code
Thanks In Advance
Shaju Thomas
e-Cosmos
Technologies Ltd.,
Mail: [EMAIL PROTECTED]
Phone(Off) :
51217038/39 Extn: 132
Mobile: +91 98455
21794
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