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CHAPTER 20 FILES, STREAMS, AND IO
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stream: stream: stream: stream: stream:
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Using the FileStream Class
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The FileStream class is backed by a file on a disk. This means that your data will continue to exist (persist) after your program has finished. You can get FileStream objects in a range of ways. The most common are using the methods defined in the File class (which are listed in Table 20-13) or the FileInfo class (Table 20-7) or using the constructor to create an object directly from the class. There are a number of constructor versions in the FileStream class, but the one you will typically use is this one:
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FileStream(string, FileMode, FileAccess)
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The string parameter is the path of the file you want to work with. The FileMode enumeration defines how you want the file to be opened; these values are described in Table 20-24. Table 20-24. FileMode Values
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Values
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Description
A new file will be created. If the file specified by the string parameter exists, an IOException will be thrown. If the specified file exists, it will be overwritten. If it does not exist, it will be created. If the file exists, it will be opened. If it does not exist, a FileNotFoundException is thrown. If the file exists, it is opened (and not overwritten). If the file does not exist, it is created. The file is opened and truncated so that the size is zero and any previous data is deleted. If the file exists, it will be opened, and the cursor moved to the end of the file.
Create
Open
OpenOrCreate
Truncate
Append
CHAPTER 20 FILES, STREAMS, AND IO
The FileAccess enumeration allows you specify whether you want to read and/or write to the FileStream that is created. The FileAccess values are described in Table 20-25. Table 20-25. FileAccess Values
Values
Read Write ReadWrite
Description
The stream will allow data to be read. The stream will allow data to be written. The stream will allow data to be read and written.
In addition to the members defined by the Stream class, FileStream defines methods that are helpful for working with files; these are described in Table 20-26. Table 20-26. FileStream Methods
Method
Flush(bool)
Description
Flushes any cached data. If the parameter value is true, any intermediate buffers (such as those maintained by the operating system) will also be flushed so that the data is written to disk. Locks a region of the file so that other processes cannot read or write to that part of the file. The first parameter defines the start of the region to lock. The second parameter defines the length of the region. Unlocks a previously locked region of the file.
Lock(long, long)
Unlock(long, long)
Listing 20-18 provides a demonstration of using the FileStream class. Listing 20-18. Using the FileStream Class using System; using System.IO; class Listing 18 { static void Main(string[] args) { // create a file stream to an existing file FileStream myStream = new FileStream("tempfile.txt", FileMode.Create, FileAccess.ReadWrite); // write some data to the file for (int i = 0; i < 5; i++) { Console.WriteLine("Writing value: {0}", i); myStream.WriteByte((byte)i);
CHAPTER 20 FILES, STREAMS, AND IO
} // flush the data, including any intermediate buffers myStream.Flush(true); // close the file myStream.Close(); // create a new Stream to the same file FileStream myOtherStream = new FileStream("tempfile.txt", FileMode.Open, FileAccess.Read); // read the data from the stream for (int value; (value = myOtherStream.ReadByte()) > -1; ) { Console.WriteLine("Read Value: {0}", value); } // close the file myOtherStream.Close(); // delete the file File.Delete("tempfile.txt"); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Listing 20-18 opens a FileStream that creates a new file and writes a series of byte values to it. The data is flushed to the disk, and the FileStream is closed. A second FileStream opens the file in a readonly mode and reads the data back in again. The file is deleted so that the example can be run repeatedly. Compiling and running Listing 20-18 produces the following results: Writing value: Writing value: Writing value: Writing value: Writing value: Read Value: 0 Read Value: 1 Read Value: 2 Read Value: 3 Read Value: 4 Press enter to 0 1 2 3 4
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