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For Each rootDir As String In Directory.GetLogicalDrives PrintDirTree(rootDir, True) Next
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The GetFiles and GetDirectories methods can take a second argument containing wildcards to filter the result:
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Display all the *.txt files in C:\DOCS. For Each fname As String In Directory.GetFiles( c:\docs", *.txt ) Console.WriteLine(fname) Next
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You can use the GetCreationTime, GetLastAccessTime, GetLastWriteTime, and GetAt tributes shared methods to display information about a file or a directory or to filter files according to their attributes:
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For Each fname As String In Directory.GetFiles( c:\docs", *.txt ) Display only read-only files. If CBool(File.GetAttributes(fname) And FileAttributes.ReadOnly) Then Console.WriteLine(fname) End If Next
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Each GetxxxxTime and SetxxxxTime method that reads or modifies a DateTime value has a matching GetxxxxTimeUtc and SetxxxxTimeUtc method (not listed in Table 9-1)
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9:
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Files, Directories, and Streams
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that works with coordinated universal time (UTC), that is, an absolute DateTime that isn t affected by the current time zone. These methods were added in .NET Framework 1.1 to let you compare files that are scattered over the worldwide Internet. For exam ple, you can use the File.GetLastWriteUtc method to implement a replication program that compares the files at two Internet sites in different time zones and overwrites the older one with the newer version. The Directory class doesn t expose a GetAttributes method, but the File.GetAttributes method works also for directories, so this limitation isn t a problem. The SetAttributes and GetAttributes methods set or return a bit-coded FileAttributes value, which is a combination of Normal (no attributes), Archive, ReadOnly, Hidden, System, Directory, Compressed, Encrypted, Temporary, NotContentIndexed, and a few other values:
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Display system and hidden files in C:\. For Each fname As String In Directory.GetFiles( C:\ ) Dim attr As FileAttributes = File.GetAttributes(fname) Display the file if marked as hidden or system (or both). If CBool(attr And FileAttributes.Hidden) Or _ CBool(attr And FileAttributes.System) Then Console.WriteLine(fname) End If Next
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With a little bit-tweaking, you can make the If expression more concise, as follows:
If CBool(attr And (FileAttributes.Hidden Or FileAttributes.System)) Then
The Directory.CreateDirectory method creates a directory and all the intermediate directories in the path if necessary:
Next line works even if the C:\MyApp directory doesn t exist yet. Directory.CreateDirectory( C:\MyApp\Data )
The SetCreationTime, SetLastWriteTime, and SetLastAccessTime methods let you mod ify the date attributes of a file or directory:
Change the access date and time of all files in C:\DOCS. For Each fname As String In Directory.GetFiles( c:\docs ) File.SetLastAccessTime(fname, Date.Now) Next
The SetCreationTime method can easily create a touch utility that modifies the last write time of all the files specified on its command line:
Change the access date and time of all files whose names are@ passed on the command line.@ Sub Main(ByVal args() As String)@ For Each fname As String In args File.SetCreationTime(fname, Date.Now) Next End Sub
Part III:
Programming the .NET Framework
The File object serves primarily two purposes. First, you can use it to process closed files for example, to delete, copy, or move them or to retrieve information such as creation date and attributes. Second, you can use it to open a file and create a FileStream object, which you then use to actually read from and write to the open file. You set three values when you call the Open method:
FileMode Can be Append, Create, CreateNew, Open, OpenOrCreate, or Trun cate. Open and Append modes fail if the file doesn t exist; Create and CreateNew fail if the file exists already. Use OpenOrCreate to open a file or to create one if it doesn t exist yet. FileAccess Can be Read, Write, or ReadWrite. FileShare Tells which operations other FileStreams can perform on the open file. It can be None (all operations are prohibited), ReadWrite (all operations are allowed), Read, Write, or Inheritable (though Inheritable isn t supported directly by Win32).
The File class exposes three variants of the Open method: Create, OpenRead, and OpenWrite. Both the generic Open method and these variants return a FileStream object, and I ll illustrate all of them later in this chapter. There are also three specific methods for working with text files (CreateText, OpenText, and AppendText) that return a StreamReader or StreamWriter object.
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