code 39 vb.net Changing the Console Streams in Visual Basic .NET

Printer Code-128 in Visual Basic .NET Changing the Console Streams

Changing the Console Streams
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In common with Java, the .NET console class allows new streams to be substituted for the default instances. This is useful for redirecting console output to a file or filtering the output before displaying it to the user. The In, Out, and Error properties are read-only, but the SetIn, SetOut, and SetError methods of Console can be used to install new instances of TextReader and TextWriter as required.
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Console Summary
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Table 10-2 provides a summary of the Java-to-.NET mappings for using the console. All members are static.
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10. Streams, Files, and I/O
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Table 10-2. Comparison Between the Java and .NET Console Classes
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Java System.in System.out System.err System.out.println() System.out.print() System.in.read() N/A System.err.print() System.err.println() System.setIn() System.setOut() System.setErr()
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.NET Console.In Console.Out Console.Error Console.WriteLine() Console.Out.WriteLine() Console.Write() Console.Out.Write() Console.Read() Console.In.Read() Console.ReadLine() Console.In.ReadLine() Console.Error.Write() Console.Error.WrintLine() Console.SetIn() Console.SetOut() Console.SetError()
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The File System
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This section covers the classes that provide access to the file system. Creating, copying, and deleting files and directories are handled in Java by the java.io.File class. A slightly different approach is taken by .NET, but the end result is much the same. We end this section with a comparison of the Java and .NET file system methods.
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Paths
The System.IO.Path class contains a series of static utility methods used to manipulate strings representing file and directory paths. With the exception of the GetTempFileName method, the Path class does not interact with the file system. Although the Path class provides little functionality that can't be achieved using string parsing and regular expressions, it is designed to provide cross-platform support. When the .NET Framework is ported to other platforms, applications that utilize the Path class should work seamlessly.
Note
When using the Path class to formulate file paths, bear in mind that although the class ensures that paths do not contain illegal characters, no checks are made to ensure that the path is valid on the local system.
Table 10-3 summarizes the methods and fields of the Path class.
10. Streams, Files, and I/O
Table 10-3. The Path Class
Member DirectorySeparatorChar
Comments The platform-specific separator character. Defaults to \ for Windows. Provides a platform-specific array of characters that are InvalidPathChars illegal in path names. Provides a platform-specific path separator character. PathSeparator Defaults to ; for Windows. Provides a platform-specific volume separator character. VolumeSeparatorChar Defaults to : for Windows. Changes the extension of a path string. ChangeExtension() Concatenates two path strings. Combine() Gets the contents of a path string between the first and last GetDirectoryName() instances of DirectorySeparatorChar. Returns the extension of a path string, including the period. GetExtension() Returns the contents of a path string after the last instance of GetFileName() DirectorySeparatorChar. GetFileNameWithoutExtension() Returns the contents of a path string after the last instance of DirectorySeparatorChar and before the last period. Returns a fully qualified path for a partial path string. If the GetFullPath() partial path begins with the directory separator character, the result will be prepended with <default drive>:; otherwise, the result will be the current working directory plus the partial path name. Returns the root for a path string. GetPathRoot() Creates a zero-length temporary file with a unique path, GetTempFileName() which is returned as the result. GetTempPath() Returns the path of the current system's temporary directory. Returns true if the path string contains the period character HasExtension() followed by at least one other character. Returns true if the path is fully qualified. IsPathRooted()
Files and Directories
Java handles interrogating the file system through a single class, java.io.File. .NET breaks the same functionality up into four separate classes, which provides some flexibility. We feel, however, that this results in an overly complex approach that can be frustrating to work with. Two classes contain static methods for managing the file system. The System.IO.Directory class provides methods to create, move, and manage directories, while the System.IO.File class offers the same services for files. Every call to a method in one of these classes requires a string containing the name of the desired file or directory. These classes are supplemented by System.IO.DirectoryInfo and System.IO.FileInfo, which offer largely the same functionality as Directory and File but require instantiation prior to use. Instances of DirectoryInfo and FileInfo are created by passing a path string into the
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