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

Drawing DataMatrix in Visual C#.NET FILES, STREAMS, AND IO

CHAPTER 20 FILES, STREAMS, AND IO
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File name: .\Listing 01.pdb File name: .\Listing 01.vshost.exe File name: .\Listing 01.vshost.exe.manifest
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Filtering File and Directory Results
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The overloaded versions of the methods described in Table 20-2 allow you to apply a filter so that only files or directories that match a search string are included in the results. Listing 20-2 contains an example. Listing 20-2. Filtering Results with a Search String using System; using System.IO; class Listing 02 { static void Main(string[] args) { string[] filteredNames = Directory.GetFiles(@"C:\", "page*"); foreach (string name in filteredNames) { Console.WriteLine("Name: {0}", name); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } There are two special characters you can use when specifying a search filter. An asterisk (*) will match zero or more characters, and a question mark ( ) will match any one character. In Listing 20-2, the search filter is page*, which will match any result that starts with page. Compiling and running Listing 20-2 produces the following result: Name: C:\pagefile.sys Press enter to finish The file pagefile.sys is a match for the search filter because it begins with the string page. Here is an example of using the character in a search filter: string[] filteredNames = Directory.GetFiles(@"C:\", "pagefile. "); foreach (string name in filteredNames) { Console.WriteLine("Name: {0}", name); }
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CHAPTER 20 FILES, STREAMS, AND IO
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The search filter in this example will match any filename that starts with pagefile. (including the period) and that has any three characters as the file extension. The output from these statements on my machine is the same as the previous example: Name: C:\pagefile.sys Press enter to finish The examples so far have only listed the files and directories at the root level of the directory we have specified. You can use values from the System.IO.SearchOption enumeration to control whether the search will include subdirectories. Table 20-3 describes the two values of SearchOption. Table 20-3. Values from the System.IO.SearchOption Enumeration
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Value
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TopDirectoryOnly
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The results will include only files and directories in the top directory. The results will include files and directories in subdirectories.
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AllDirectories
Listing 20-3 contains a demonstration of searching subdirectories by using the AllDirectories value from the SearchOption enumeration. Listing 20-3. Including Subdirectories in a File System Search using System; using System.IO; class Listing 03 { static void Main(string[] args) { string[] filteredNames = Directory.GetFiles(@"C:\Program Files", "*.exe", SearchOption.AllDirectories); foreach (string name in filteredNames) { Console.WriteLine("Name: {0}", name); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } }
CHAPTER 20 FILES, STREAMS, AND IO
Listing 20-3 uses the Directory.GetFiles method to create a list of all the .exe files that are in the C:\Program Files directory and any of its subdirectories. Compiling and running Listing 20-3 produces the following results, which I have edited for length; there are a lot of executable files: Name: Name: Name: Name: Name: Name: Name: ... Name: Name: Name: Name: Press C:\Program C:\Program C:\Program C:\Program C:\Program C:\Program C:\Program Files\7-Zip\7z.exe Files\7-Zip\7zFM.exe Files\7-Zip\7zG.exe Files\Common Files\Microsoft Files\Common Files\Microsoft Files\Common Files\Microsoft Files\Common Files\Microsoft
Shared\DW\DW20.EXE Shared\DW\DWTRIG20.EXE Shared\EQUATION\EQNEDT32.EXE Shared\ink\ConvertInkStore.exe
C:\Program Files\Windows C:\Program Files\Windows C:\Program Files\Windows C:\Program Files\Windows enter to finish
Media Player\WMPSideShowGadget.exe NT\Accessories\wordpad.exe Photo Viewer\ImagingDevices.exe Sidebar\sidebar.exe
You must be careful when using the GetFiles, GetDirectories, and GetFileSystemEntries methods to ensure that you have the required permissions to view all the files and directories that are in the directory parameter you pass to the method and its subdirectories. If you do not, then you will encounter an exception. Here is a demonstration: string[] filteredNames = Directory.GetFiles(@"C:\Windows", "*.exe", SearchOption.AllDirectories); foreach (string name in filteredNames) { Console.WriteLine("Name: {0}", name); } This example searches for all executable files in the C:\Windows directory and its subdirectories. If I compile and run these statements without administration privileges, I get the following exception: Unhandled Exception: System.UnauthorizedAccessException: Access to the path 'C:\Windows\AppCompat\Programs\' is denied. at System.IO. Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileSystemEnumerableIterator`1.AddSearchableDirsToStack(SearchData localSearchData) at System.IO.FileSystemEnumerableIterator`1.MoveNext() at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) at System.IO.Directory.GetFiles(String path, String searchPattern, SearchOption searchOption) at Listing 03.Main(String[] args) in C:\Listing 03\Listing 03.cs:line 9 Press any key to continue . . .
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