print barcode with vb.net 11: Using I/O in C#.NET

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11: Using I/O
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1 Byte streams are useful for file I/O, especially binary file I/O, and they support random access files The character streams are optimized for Unicode 2 The class at the top of the stream hierarchy is Stream 3 Here is one way to open a file for byte input: FileStream fin = new FileStream("myfile", FileModeOpen); 4 Here is one way to open a file for reading characters: StreamReader frdr_in = new StreamReader(new FileStream("myfile", FileModeOpen));
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Appendix A: Answers to Self Tests
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5 Seek( ) sets the current file position 6 Binary I/O for the C# built-in types is supported by BinaryReader and BinaryWriter 7 I/O is redirected by calling SetIn( ), SetOut( ), and SetError( ) 8 A numeric string can be converted into its internal representation by using the Parse( ) method defined by the NET structure aliases 9 /* Copy a text file, substituting hyphens for spaces This version uses byte streams To use this program, specify the name of the source file and the destination file For example: Hyphen source target */ using System; using SystemIO; class Hyphen { static void Main(string[] args) { int i; FileStream fin; FileStream fout; if(argsLength != 2) { ConsoleWriteLine("Usage: Hyphen From To"); return; } // Open the input file try { fin = new FileStream(args[0], FileModeOpen); } catch(IOException exc) { ConsoleWriteLine(excMessage); return; } // Open the output file try { fout = new FileStream(args[1], FileModeCreate); } catch(IOException exc) { ConsoleWriteLine(excMessage); finClose(); return; }
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C# 30: A Beginner s Guide
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// Copy the file try { do { i = finReadByte(); if((char)i == ' ') i = '-'; if(i != -1) foutWriteByte((byte) i); } while(i != -1); } catch(IOException exc) { ConsoleWriteLine(excMessage); } finClose(); foutClose(); } } 10 /* Copy a text file, substituting hyphens for spaces This version uses character streams To use this program, specify the name of the source file and the destination file For example: Hyphen source target */ using System; using SystemIO; class Hyphen { static void Main(string[] args) { int i; StreamReader fin; StreamWriter fout; if(argsLength != 2) { ConsoleWriteLine("Usage: Hyphen From To"); return; } // Open the input file try { fin = new StreamReader(args[0]); } catch(IOException exc) { ConsoleWriteLine(excMessage); return; }
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Appendix A: Answers to Self Tests
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// Open the output file try { fout = new StreamWriter(args[1]); } catch(IOException exc) { ConsoleWriteLine(excMessage); finClose(); return; } // Copy the file try { do { i = finRead(); if((char)i == ' ') i = '-'; if(i != -1) foutWrite((char) i); } while(i != -1); } catch(IOException exc) { ConsoleWriteLine(excMessage); } finClose(); foutClose(); } }
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12: Delegates, Events, and Namespaces
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1 delegate double Filter(int i); 2 A multicast is created by adding methods to a delegate chain using the += operator A method can be removed by use of = 3 An anonymous method is a block of code that is passed to a delegate constructor 4 Yes Yes 5 An event requires the use of a delegate 6 event 7 Yes, events can be multicast 8 An event is always sent to a specific instance 9 A namespace defines a declarative region, which prevents name collisions 10 using alias = name; 11 namespace XY { // }
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C# 30: A Beginner s Guide
13: Generics
1 True 2 A type parameter is a placeholder for an actual type The actual type will be specified when an object of a generic class or delegate is instantiated, or when a generic method is called 3 A type argument is an actual data type that is passed to a type parameter 4 When operating through object references, the compiler won t catch type-mismatch errors between the type of data supplied and the type of data required This causes those errors to occur at runtime 5 A base class constraint on a type parameter requires that any type argument specified for that parameter be derived from or identical to the specified base class The value-type constraint requires that a type argument be of a value type, not a reference type 6 Yes 7 To obtain a default value for a type, use the default operator 8 The type parameter list for a generic method immediately follows the name of the method Thus, it goes between the method name and the opening parenthesis of the method s parameter list 9 Yes 10 Here is one approach It uses auto-implemented properties for X and Y public interface ITwoDCoord<T> { T X { get; set; } T Y { get; set; } } class XYCoord<T> : ITwoDCoord<T> { public XYCoord(T x, T y) { X = x; Y = y; } public T public T } X { get; set; } Y { get; set; }
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