vb.net barcode generator open source FILES, STREAMS, AND IO in C#

Drawing Data Matrix 2d barcode in C# FILES, STREAMS, AND IO

CHAPTER 20 FILES, STREAMS, AND IO
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Using the System.IO.Path Class
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The Path class simplifies working with path strings and does so in a platform-independent way. This means that you don t have to hard-code separator characters, for example. Table 20-14 summarizes the members of the Path class. Table 20-14. System.IO.Path Members
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ChangeExtension(string, string) Combine(string[]) Combine(string, string) Combine(string, string, string) Combine(string, string, string)
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Changes the extension component of a path string Combines the parameters (or the elements in the array parameter) to form a properly separated path string, which is returned as a result
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GetDirectoryName(string) GetFileName(string) GetFileNameWithoutExtension(string) GetFullPath(string) GetInvalidFileNameChars() GetInvalidPathNameChars() GetPathRoot(string) GetRandomeFileName()
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Returns the directory part of a path string Returns the name of the file from a path string, with or without the file extension component Returns a fully qualified path from a relative path Returns a char array that contains the characters that cannot be used in file names or paths Returns the root component of a path string Returns a random string that can be used as a file or directory name. Creates a uniquely named temporary file on disk and returns the name of it. Returns the path for the current user s temporary folder Returns true if the specified path has an extension component Returns the platform specific path separator character
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GetTempFileName()
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GetTempPath()
HasExtension(string)
PathSeparator
Listing 20-12 demonstrates using some of the members of the Path class. These methods do not modify the files or directories that the path strings refer to; they only help manipulate the strings themselves.
CHAPTER 20 FILES, STREAMS, AND IO
Listing 20-12. Using the Path Class using System; using System.IO; class Listing 12 { static void Main(string[] args) { // combine strings to make a path string[] strComponents = new string[] { @"C:\", "pagefile.sys" }; string combinedPath = Path.Combine(strComponents); Console.WriteLine("Combined path: {0}", combinedPath); // does the path have an extension bool hasExtension = Path.HasExtension(combinedPath); Console.WriteLine("Has extension: {0}", hasExtension); // change the extension part of the path string extensionMod = Path.ChangeExtension(combinedPath, "dat"); Console.WriteLine("Modified path: {0}", extensionMod); // get the file name (with and without the extension) string fileName = Path.GetFileName(combinedPath); string fileNameNoExt = Path.GetFileNameWithoutExtension(combinedPath); Console.WriteLine("File name: {0}", fileName); Console.WriteLine("File name (no extension): {0}", fileNameNoExt); // get the user's temp directory string tempDir = Path.GetTempPath(); Console.WriteLine("Temp dir: {0}", tempDir); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Compiling and running Listing 20-12 produces the following output: Combined path: C:\pagefile.sys Has extension: True Modified path: C:\pagefile.dat File name: pagefile.sys File name (no extension): pagefile Temp dir: C:\Users\Adam\AppData\Local\Temp\ Press enter to finish
CHAPTER 20 FILES, STREAMS, AND IO
Monitoring for Changes
The System.IO.FileSystemWatcher class can be used to monitor a directory for changes. The class defines a set of events, which are invoked when different kinds of change are detected. 10 describes C# events. Listing 20-13 demonstrates using a FileSystemWatcher to monitor a directory. Listing 20-13. Monitoring a Directory for Changes using System; using System.IO; class Listing 13 { static void Main(string[] args) { // create temporary directory string tempDirPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName()); // create the directory specified by the path Directory.CreateDirectory(tempDirPath); // create a FileSystemWatcher to look for changes FileSystemWatcher fsWatcher = new FileSystemWatcher(tempDirPath); // register handlers fsWatcher.Changed += fsWatcher.Created += fsWatcher.Deleted += with the events of the watcher new FileSystemEventHandler(HandleFileSystemChangeEvent); new FileSystemEventHandler(HandleFileSystemChangeEvent); new FileSystemEventHandler(HandleFileSystemChangeEvent);
// start watching for events fsWatcher.EnableRaisingEvents = true; // create a file name that we will use in the temp directory string tempFilePath = Path.Combine(tempDirPath, Path.GetRandomFileName()); Console.WriteLine("Temp file name is: {0}", tempFilePath); // create a new file in the temp directory File.WriteAllText(tempFilePath, "Hello World"); // replace the contents of the file File.WriteAllText(tempFilePath, "Introduction to C#"); // delete the file File.Delete(tempFilePath); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } static void HandleFileSystemChangeEvent(object sender, FileSystemEventArgs arg) {
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