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The C# Language
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KeyChar contains the char equivalent of the character that was pressed Key contains a value from the ConsoleKey enumeration, which is an enumeration of all the keys on the keyboard Modifiers describes which, if any, of the keyboard modifiers ATL, CTRL, or SHIFT were pressed when the keystroke was generated These modifiers are represented by the ConsoleModifiers enumeration, which has these values: Control, Shift, and Alt More than one modifier value might be present in Modifiers The major advantage to ReadKey( ) is that it provides a means of achieving interactive keyboard input because it is not line buffered To see the effect of this, try the following program:
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// Read keystrokes from the console by using ReadKey() using System; class ReadKeys { static void Main() { ConsoleKeyInfo keypress; ConsoleWriteLine("Enter keystrokes Enter Q to stop"); do { keypress = ConsoleReadKey(); // read keystrokes ConsoleWriteLine(" Your key is: " + keypressKeyChar); // Check for modifier keys if((ConsoleModifiersAlt & keypressModifiers) != 0) ConsoleWriteLine("Alt key pressed"); if((ConsoleModifiersControl & keypressModifiers) != 0) ConsoleWriteLine("Control key pressed"); if((ConsoleModifiersShift & keypressModifiers) != 0) ConsoleWriteLine("Shift key pressed"); } while(keypressKeyChar != 'Q'); } }
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A sample run is shown here:
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Enter keystrokes Enter Q to stop a Your key is: a b Your key is: b d Your key is: d A Your key is: A Shift key pressed B Your key is: B Shift key pressed C Your key is: C Shift key pressed Your key is: Control key pressed Q Your key is: Q Shift key pressed
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14:
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Using I/O
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As the output confirms, each time a key is pressed, ReadKey( ) immediately returns the keypress As explained, this differs from Read( ) and ReadLine( ), which use line-buffered input Therefore, if you want to achieve interactive responses from the keyboard, use ReadKey( )
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PART I PART I PART I
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Writing Console Output
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ConsoleOut and ConsoleError are objects of type TextWriter Console output is most easily accomplished with Write( ) and WriteLine( ), with which you are already familiar Versions of these methods exist that output for each of the built-in types Console defines its own versions of Write( ) and WriteLine( ) so they can be called directly on Console, as you have been doing throughout this book However, you can invoke these (and other) methods on the TextWriter that underlies ConsoleOut and ConsoleError if you choose Here is a program that demonstrates writing to ConsoleOut and ConsoleError By default, both write to the console
// Write to ConsoleOut and ConsoleError using System; class ErrOut { static void Main() { int a=10, b=0; int result; ConsoleOutWriteLine("This will generate an exception"); try { result = a / b; // generate an exception } catch(DivideByZeroException exc) { ConsoleErrorWriteLine(excMessage); } } }
The output from the program is shown here:
This will generate an exception Attempted to divide by zero
Sometimes newcomers to programming are confused about when to use ConsoleError Since both ConsoleOut and ConsoleError default to writing their output to the console, why are there two different streams The answer lies in the fact that the standard streams can be redirected to other devices For example, ConsoleError can be redirected to write to a disk file, rather than the screen Thus, it is possible to direct error output to a log file, for example, without affecting console output Conversely, if console output is redirected and error output is not, then error messages will appear on the console, where they can be seen We will examine redirection later, after file I/O has been described
FileStream and Byte-Oriented File I/O
The NET Framework provides classes that allow you to read and write files Of course, the most common type of files are disk files At the operating system level, all files are byte
Part I:
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