06.16.04
Accepting command line arguments
In C++ it is possible to accept command line arguments. To do so,
you must first understand the full definition of int main(). It actually
accepts two arguments, one is number of command line arguments, the
other is a listing of the command line arguments.
It looks like this:
int main(int argc, char* argv[])
The integer, argc is the ARGument Count (hence argc). It is the number
of arguments passed into the program from the command line, including
the path to and name of the program.
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Processing Global Mouse and Keyboard Hooks in C#
This class allows you to tap keyboard and mouse and/or to detect their
activity even when an application runs in the background or does not
have any user interface at all. This class raises common .NET events
with KeyEventArgs and MouseEventArgs, so you can easily retrieve any
information you need.
Background
There are a number of applications that run in background and detect
user inactivity to change their mode. For example, MSN Messenger (or
any other messenger). I was going to write such an application, so
I searched MSDN and found "exactly" what I needed: 318804 - HOW TO:
Set a Windows Hook in Visual C# .NET. This article describes how to
tap the mouse movement, but it was working only when an application
was active. At the end of this article, I found this explanation:
"Global Hook Is Not Supported in .NET Framework. You cannot implement
global hooks in Microsoft .NET Framework...". Anyway, I continued
my research and found out that there are exceptions. There are WH_KEYBOARD_LL
and WH_MOUSE_LL hooks that can be installed globally. So I have basically
replaced WH_MOUSE to WH_MOUSE_LL in the MSDN example and it worked.
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Writing a Smart Card Library
In this article we are going to develop a Smart Card Library that
will ease the development of Smart Card Applications using the Win32
SDK and/or MFC. This assumes that you’re familiar with Win32 and MFC.
The library builds upon the available support for Smart Cards in Windows
by providing an Object Oriented wrapper over the WinSCard API. One
advantage of using this library is the layered approach, which isolates
the core API’s available to non-Win32 conformant languages like java
to access this library through JNI (Java Native Interfaces). If you’ve
already developed some applications using the APIs exposed by WinSCard.dll
then you’ll be well aware of the complexities involved and here is
an attempt to ease them.
Microsoft has provided several enhancements toward the use of PCSC
conformant Smart Cards with the operating systems releases made after
Windows 2000.There is available a COM wrapper and Smart Card Base
Components provided as a part of this enhancements.
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[ memberwiseclone() function ]
Like finalize() method, we also come to see memberwiseclone() method
in almost every class ,as protected instance methods . It is inherited
from Object class, which is the mother class of .NET classes.
By definition, memberwiseclone() method "creates a shallow copy of
the current Object." A shallow copy of an Object is a copy of the
Object only. If the Object contains references to other objects, the
shallow copy will not create copies of the referred objects. It will
refer to the original objects instead. On the other hand, a deep copy
of an object creates a copy of the object and a copy of everything
directly or indirectly referenced by that object.
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Working with Delegates in C#
Imagine that you need your program to call a method, but you can't
know what that method will be until run-time. Perhaps it's a sort
method, such as a bubble sort, merge sort, or quick sort. What if
your algorithm needs a mathematical function, but the exact algorithm
can't be determined until specific data is analyzed? Sometimes, generic
GUI events and controls need to provide notification mechanisms for
their events, but only the developer knows which callbacks are appropriate
for a given implementation. All of these situations are practical
applications and reasons for using delegates.
With delegates, you can reference methods and build algorithms that
work, regardless of what those methods are. If you're familiar with
C++, you might recognize this as being the same as function pointers.
However, the difference with C# is that delegates are object-oriented
and type safe.
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An Intro to Destructors in C#
The article aims to introduce the way the destructors are implemented
in .NET. Let us start by defining destructors in simple terms.
Destructor is method in the class which is aimed to release the resources
that the instance of the class has acquired. This method is called
by CLR when the instance of the class is getting destructed.
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Read this Newsletter at: http://www.cprogrammingtrends.com/2004/0616.html |
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| From the Forum: |
| I know what databases can do... |
| I know pretty much how to set up a database...its the entry part that drives me nuts. I would like to learn how
to set up user friendly input forms that integrate directly with my database. In other words I do not want to have to remember
a bunch of key codes for products in order to do entries for a vendor. This form would have to input data into three seperate
tables, but all be shown on one form. ...
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