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Else mode = FileMode.Append End If ' Write the message. Dim fileName As String = CStr(ViewState("LogFile")) Using fs As New FileStream(fileName, mode) ' Create a LogEntry object. Dim entry As New LogEntry(message) ' Create a formatter. Dim formatter As New BinaryFormatter() ' Serialize the object to a file. formatter.Serialize(fs, entry) End Using End Sub The last step is to change the code that fills the label with the complete log text. Instead of reading the raw data, it now deserializes each saved instance using the BinaryFormatter, as shown here: Protected Sub cmdRead_Click(ByVal sender As Object, ByVal e As System.EventArgs) If ViewState("LogFile") IsNot Nothing Then Dim fileName As String = CStr(ViewState("LogFile")) Using fs As New FileStream(fileName, FileMode.Open) ' Create a formatter. Dim formatter As New BinaryFormatter() ' Get all the serialized objects. Do While fs.Position < fs.Length ' Deserialize the object from the file. Dim entry As LogEntry = CType(formatter.Deserialize(fs), LogEntry) ' Display its information. lblInfo.Text &= entry.Date.ToString() & "<br>" lblInfo.Text &= entry.Message & "<br>" Loop End Using End If End Sub So, exactly what information is stored when an object is serialized Both the BinaryFormatter and the SoapFormatter use a proprietary .NET serialization format that includes information about the class, the assembly that contains the class, and all the data stored in the class member variables. Although the binary format isn t completely interpretable, if you display it as ordinary ASCII text, it looks something like this: GApp_Web_a7ve1ebl, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null LogEntry message date Page loaded for the first time. The SoapFormatter produces more readily interpretable output, although it stores the same information (in a less compact form). The assembly information is compressed into a namespace string, and the data is enclosed in separate elements: <SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:clr="http://schemas.microsoft.com/soap/encoding/clr/1.0"

RootDirectory GetDrives()

user-specific log. To prevent the chance for an inadvertent conflict if two web pages try to use the same log, you can use the following two techniques: Create a user-specific directory for each user. Add some information to the filename, such as a timestamp, GUID (global unique identifier), or random number. This reduces the chance of duplicate filenames to a small possibility. The following sample page demonstrates this technique. It defines a method for creating filenames that are statistically guaranteed to be unique. In this case, the filename incorporates a GUID. Here s the private method that generates a new unique filename: private string GetFileName() { // Create a unique filename. string fileName = "user." + Guid.NewGuid().ToString(); // Put the file in the current web application path. return Path.Combine(Request.PhysicalApplicationPath, fileName); }

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SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <SOAP-ENV:Body> <a1:LogEntry id="ref-1" xmlns:a1= "http://schemas.microsoft.com/clr/assem/App_Web_m9gesigu%2C%20Version%3D0.0.0.0%2C %20Culture%3Dneutral%2C%20PublicKeyToken%3Dnull "> <message id="ref-3">Page loaded for the first time.</message> <date>2005-09-21T22:50:04.8677568-04:00</date> </a1:LogEntry> </SOAP-ENV:Body> </SOAP-ENV:Envelope> Clearly, this information is suitable just for .NET-only applications. However, it provides the most convenient, compact way to store the contents of an entire object.

Attempting to read from a drive that s not ready (for example, a CD drive that doesn t currently have a CD in it) will throw an exception. To avoid this problem, check the DriveInfo.IsReady property and attempt to read other properties only if the DriveInfo.IsReady property returns true.

A GUID is a 128-bit integer. GUID values are tremendously useful in programming because they re statistically unique. In other words, you can create GUID values continuously with little chance of ever creating a duplicate. For that reason, GUIDs are commonly used to uniquely identify queued tasks, user sessions, and other dynamic information. They also have the advantage over sequential numbers in that they can t easily be guessed. The only disadvantage is that GUIDs are long and almost impossible to remember (for an ordinary human being). GUIDs are commonly represented in strings as a series of lowercase hexadecimal digits, like 382c74c3-721d4f34-80e5-57657b6cbc27.

Summary

The Attributes property of the FileInfo and DirectoryInfo classes represent the file system attributes for the file or directory. Because every file and directory can have a combination of attributes, the Attributes property contains a combination of values from the FileAttributes enumeration. Table 13-7 describes these values. Table 13-7. Values for the FileAttributes Enumeration

Using the GetFileName() method, you can create a safer logging application that writes information about the user s actions to a text file. In this example, all the logging is performed by calling a Log() method, which then checks for the filename and assigns a new one if the file hasn t been created yet. The text message is then added to the file, along with the date and time information. private void Log(string message) { // Check for the file. FileMode mode; if (ViewState["LogFile"] == null) { // First, create a unique user-specific filename. ViewState["LogFile"] = GetFileName(); // The log file must be created. mode = FileMode.Create; } else { // Add to the existing file. mode = FileMode.Append; }

In this chapter, you learned how to use the .NET classes for retrieving file system information. You also examined how to work with files and how to serialize objects. Along the way you learned how data binding can work with the file classes, how to plug security holes with the Path class, and how to deal with file contention in multiuser scenarios. You also considered data compression using GZIP .

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