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Make QR Code ISO/IEC18004 in Visual C#.NET PART I

PART I
QR-Code Drawer In Visual C#.NET
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QR Reader In Visual C#
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Inheritance
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Inheritance is the process by which one object can acquire the properties of another object This is important because it supports the concept of hierarchical classification If you think about it, most knowledge is made manageable by hierarchical (that is, top-down) classifications For example, a Red Delicious apple is part of the classification apple, which in turn is part of the fruit class, which is under the larger class food That is, the food class possesses certain qualities (edible, nutritious, and so on) which also, logically, apply to its subclass, fruit In addition to these qualities, the fruit class has specific characteristics (juicy, sweet, and so on) that distinguish it from other food The apple class defines those qualities specific to an apple (grows on trees, not tropical, and so on) A Red Delicious apple would, in turn, inherit all the qualities of all preceding classes and would define only those qualities that make it unique Without the use of hierarchies, each object would have to explicitly define all of its characteristics Using inheritance, an object need only define those qualities that make it unique within its class It can inherit its general attributes from its parent Thus, the inheritance mechanism makes it possible for one object to be a specific instance of a more general case
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Painting QR Code In VS .NET
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A First Simple Program
QR-Code Encoder In Visual Basic .NET
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It is now time to look at an actual C# program We will begin by compiling and running the short program shown next
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Code39 Encoder In C#.NET
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Part I:
Create Bar Code In Visual C#
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Draw Identcode In C#.NET
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The C# Language
UPC Symbol Reader In Visual C#
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Making UPCA In Objective-C
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/* This is a simple C# program Call this program Examplecs */ using System; class Example { // A C# program begins with a call to Main() static void Main() { ConsoleWriteLine("A simple C# program"); } }
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UPC Symbol Scanner In Java
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The primary development environment for C# is Microsoft s Visual Studio To compile all of the programs in this book, including those that use the new C# 40 features, you will need to use a version of Visual Studio 2010 (or later) that supports C# Using Visual Studio, there are two general approaches that you can take to creating, compiling, and running a C# program First, you can use the Visual Studio IDE Second, you can use the command-line compiler, cscexe Both methods are described here
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DataMatrix Drawer In None
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Using cscexe, the C# Command-Line Compiler
Reading Barcode In VS .NET
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Print Barcode In Java
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Although the Visual Studio IDE is what you will probably be using for your commercial projects, some readers will find the C# command-line compiler more convenient, especially for compiling and running the sample programs shown in this book The reason is that you don t have to create a project for the program You can simply create the program and then compile it and run it all from the command line Therefore, if you know how to use the Command Prompt window and its command-line interface, using the command-line compiler will be faster and easier than using the IDE
C AUTION If you are not familiar with the Command Prompt window, then it is probably better to
use the Visual Studio IDE Although the Command Prompt is not difficult to master, trying to learn both the Command Prompt and C# at the same time will be a challenging experience To create and run programs using the C# command-line compiler, follow these three steps: 1 Enter the program using a text editor 2 Compile the program using cscexe 3 Run the program
2:
An Overview of C#
Entering the Program
The source code for programs shown in this book is available at wwwmhprofessionalcom However, if you want to enter the programs by hand, you are free to do so In this case, you must enter the program into your computer using a text editor, such as Notepad Remember, you must create text-only files, not formatted word-processor files, because the format information in a word processor file will confuse the C# compiler When entering the program, call the file Examplecs
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