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CanRead CanSeek CanWrite Close() CopyTo(Stream)
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The value of these properties specifies the capabilities of the current stream implementation.
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Closes the stream. Copies the contents of the current stream to the stream specified by the parameter. Forces any buffered data to be written to the backing store.
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CHAPTER 20 FILES, STREAMS, AND IO
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Gets the number of bytes in the stream. Returns the position of the cursor. Reads the number of bytes specified by the last parameter into the byte array specified by the first parameter, starting at the index specified by the second parameter. Reads a single byte. Moves the cursor to the specified position relative to the SeekOrigin value. Sets the length of the current stream. Writes the number of bytes specified by the last parameter from the byte array parameter, starting at the index specified by the second parameter. Writes a single byte to the stream.
ReadByte() Seek(long, SeekOrigin) SetLength(long) Write(byte[], int, int) WriteByte(byte)
Listing 20-16 gives a simple demonstration of using a Stream. Ignore how the Stream object is obtained in this example. I ll go into more details about this in the next section. Listing 20-16. Using a Stream Object using System; using System.IO; class Listing 16 { static void Main(string[] args) { // create the stream object Stream myStream = File.Create(Path.GetTempFileName()); // check the capabilities of the Stream Console.WriteLine("CanRead: {0}", myStream.CanRead); Console.WriteLine("CanWrite: {0}", myStream.CanWrite); Console.WriteLine("CanSeek: {0}", myStream.CanSeek); // write a series of bytes to the stream for (int i = 0; i < 5; i++) { Console.WriteLine("Writing value: {0}", i); myStream.WriteByte((byte)i); } // flush the stream myStream.Flush();
CHAPTER 20 FILES, STREAMS, AND IO
// reposition the cursor to the start of the stream myStream.Seek(0, SeekOrigin.Begin); // read in a series of bytes for (int i = 0; i < 5; i++) { Console.WriteLine("Read value: {0}", myStream.ReadByte()); } // reposition the cursor to the start of the stream myStream.Seek(0, SeekOrigin.Begin); // write a series of bytes to the stream for (int i = 10; i < 15; i++) { Console.WriteLine("Writing value: {0}", i); myStream.WriteByte((byte)i); } // flush the stream myStream.Flush(); // close the stream myStream.Close(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Streams are such an important concept that I am going to work through the code in the listing and explain each phase of the example. You may want to skip over the next section if you have already used streams in another programming language.
Using the System.IO.Stream Class (in Detail)
The first part of Listing 20-16 obtains a Stream object using the File.Create method:
Stream myStream = File.Create(Path.GetTempFileName());
The Create method in the File class returns a FileStream class, but since I want to demonstrate using the base class, I have upcast to Stream. We ll return to FileStream later in the chapter. The next set of statements prints out the values of the CanRead, CanWrite, and CanSeek properties: Console.WriteLine("CanRead: {0}", myStream.CanRead); Console.WriteLine("CanWrite: {0}", myStream.CanWrite); Console.WriteLine("CanSeek: {0}", myStream.CanSeek); The features that a Stream object supports will change based on the data source and the way that you obtained the object. For example, when working with a network connection, you will usually obtain two Stream objects. The first will be read-only and allows you to read the data sent to you, and the second will be write-only and allow you to send data. When working a file, as we are in this example, the
CHAPTER 20 FILES, STREAMS, AND IO
features depend how you opened the file. It is possible to create Stream objects that are read-only, that are write-only, or that can be used to both read and write. The Stream object that we get back from the File.Create method can be used to read from and write to the file. The CanSeek property tells you whether the Stream object explicitly supports repositioning the cursor to a different point in the data sequence. Once again, the ability to do this depends on what data store you are working with. You can typically do this with files, because all the data is always available on the disk, but this feature has no meaning when working with network connections where data is arriving over time. At this point in the code, we have created a Stream object that is using a newly created temporary file as its backing store. The cursor is positioned at the start of the file, but there is no data (since the file is empty). Figure 20-2 illustrates what we have so far.
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