barcode printing using c#.net PART I PART I PART I in C#.NET

Generating QR in C#.NET PART I PART I PART I

PART I PART I PART I
QR Code JIS X 0510 Creation In Visual C#
Using Barcode generator for .NET framework Control to generate, create QR Code JIS X 0510 image in VS .NET applications.
QR Code 2d Barcode Scanner In Visual C#
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
Binary Streams
Bar Code Encoder In C#.NET
Using Barcode generation for VS .NET Control to generate, create barcode image in VS .NET applications.
Barcode Scanner In C#.NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET applications.
In addition to the byte and character streams, there are two binary stream classes that can be used to read and write binary data directly These streams are called BinaryReader and BinaryWriter We will look closely at these later in this chapter when binary file I/O is discussed Now that you understand the general layout of the I/O system, the rest of this chapter will examine its various pieces in detail, beginning with console I/O
Generate QR Code 2d Barcode In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create QR Code 2d barcode image in ASP.NET applications.
Drawing QR Code In .NET Framework
Using Barcode creation for .NET framework Control to generate, create QR Code image in VS .NET applications.
Console I/O
Encoding Denso QR Bar Code In Visual Basic .NET
Using Barcode printer for VS .NET Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
Encoding GS1-128 In C#.NET
Using Barcode creator for .NET Control to generate, create GS1-128 image in .NET framework applications.
Console I/O is accomplished through the standard streams ConsoleIn, ConsoleOut, and ConsoleError Console I/O has been used since 2, so you are already familiar with it As you will see, it has some additional capabilities Before we begin, however, it is important to emphasize a point made earlier in this book: Most real applications of C# will not be text-based, console programs Rather, they will be graphically oriented programs or components that rely upon a windowed interface for interaction with the user, or will be server-side code Thus, the portion of the I/O system that relates to console input and output is not widely used Although text-based programs are excellent as teaching examples, for short utility programs, and for some types of components, they are not suitable for most real-world applications
Matrix 2D Barcode Maker In C#
Using Barcode printer for .NET Control to generate, create Matrix 2D Barcode image in .NET applications.
Creating GS1 - 12 In Visual C#
Using Barcode maker for Visual Studio .NET Control to generate, create UPC A image in .NET framework applications.
Reading Console Input
Drawing Barcode In C#.NET
Using Barcode encoder for .NET framework Control to generate, create bar code image in Visual Studio .NET applications.
Rationalized Codabar Creator In Visual C#.NET
Using Barcode printer for .NET framework Control to generate, create NW-7 image in VS .NET applications.
ConsoleIn is an instance of TextReader, and you can use the methods and properties defined by TextReader to access it However, you will generally use the methods provided by Console, which automatically read from ConsoleIn Console defines three input methods The first two, Read( ) and ReadLine( ), have been available since NET Framework 10 The third, ReadKey( ), was added by NET Framework 20 To read a single character, use the Read( ) method: static int Read( ) Read( ) returns the next character read from the console It waits until the user presses a key and then returns the result The character is returned as an int, which must be cast to char Read( ) returns 1 on error This method will throw an IOException on failure When using Read( ), console input is line-buffered, so you must press ENTER before any character that you type will be sent to your program
ANSI/AIM Code 39 Encoder In None
Using Barcode maker for Office Excel Control to generate, create Code 39 Full ASCII image in Excel applications.
Code-128 Creation In Java
Using Barcode encoder for Java Control to generate, create Code-128 image in Java applications.
Part I:
Generate Code39 In VB.NET
Using Barcode creation for VS .NET Control to generate, create Code 39 Full ASCII image in .NET applications.
GS1 DataBar Encoder In .NET
Using Barcode generator for VS .NET Control to generate, create GS1 DataBar-14 image in Visual Studio .NET applications.
The C# Language
Printing EAN13 In None
Using Barcode maker for Software Control to generate, create EAN13 image in Software applications.
Code 3 Of 9 Decoder In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Here is a program that reads a character from the keyboard using Read( ):
Print GS1 128 In None
Using Barcode generation for Microsoft Word Control to generate, create EAN 128 image in Word applications.
Scanning Bar Code In VB.NET
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in VS .NET applications.
// Read a character from the keyboard using System; class KbIn { static void Main() { char ch; ConsoleWrite("Press a key followed by ENTER: "); ch = (char) ConsoleRead(); // get a char ConsoleWriteLine("Your key is: " + ch); } }
Here is a sample run:
Press a key followed by ENTER: t Your key is: t
The fact that Read( ) is line-buffered is a source of annoyance at times When you press a carriage-return, line-feed sequence is entered into the input stream Furthermore, these characters are left pending in the input buffer until you read them Thus, for some applications, you may need to remove them (by reading them) before the next input operation (To read keystrokes from the console in a non-line-buffered manner, you can use ReadKey( ), described later in this section) To read a string of characters, use the ReadLine( ) method It is shown here:
ENTER,
static string ReadLine( ) ReadLine( ) reads characters until you press ENTER and returns them in a string object This method will also throw an IOException on failure Here is a program that demonstrates reading a string from ConsoleIn by using ReadLine( ):
// Input from the console using ReadLine() using System; class ReadString { static void Main() { string str; ConsoleWriteLine("Enter some characters"); str = ConsoleReadLine(); ConsoleWriteLine("You entered: " + str); } }
Here is a sample run:
14:
Using I/O
Enter some characters This is a test You entered: This is a test
PART I PART I PART I
Although the Console methods are the easiest way to read from ConsoleIn, you can call methods on the underlying TextReader For example, here is the preceding program rewritten to use the ReadLine( ) method defined by TextReader:
// Read a string from the keyboard, using ConsoleIn directly using System; class ReadChars2 { static void Main() { string str; ConsoleWriteLine("Enter some characters"); str = ConsoleInReadLine(); // call TextReader's ReadLine() method ConsoleWriteLine("You entered: " + str); } }
Notice how ReadLine( ) is now invoked directly on ConsoleIn The key point here is that if you need access to the methods defined by the TextReader that underlies ConsoleIn, you will invoke those methods as shown in this example
Using ReadKey( )
Beginning with version 20, the NET Framework has included a method in Console that enables you to read individual keystrokes directly from the keyboard in a non-line-buffered manner This method is called ReadKey( ) When it is called, it waits until a key is pressed When a key is pressed, ReadKey( ) returns the keystroke immediately The user does not need to press ENTER Thus, ReadKey( ) allows keystrokes to be read and processed in real time ReadKey( ) has these two forms static ConsoleKeyInfo ReadKey( ) static ConsoleKeyInfo ReadKey(bool noDisplay) The first form waits for a key to be pressed When that occurs, it returns the key and also displays the key on the screen The second form also waits for and returns a keypress However, if noDisplay is true, then the key is not displayed If noDisplay is false, the key is displayed ReadKey( ) returns information about the keypress in an object of type ConsoleKeyInfo, which is a structure It contains the following read-only properties char KeyChar ConsoleKey Key ConsoleModi ers Modi ers
Part I:
Copyright © OnBarcode.com . All rights reserved.