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obMyMeth(i); // calls obMyMeth(int) obMyMeth(d); // calls obMyMeth(double) obMyMeth(b); // calls obMyMeth(byte) -- now, no type conversion obMyMeth(s); // calls obMyMeth(int) -- type conversion obMyMeth(f); // calls obMyMeth(double) -- type conversion } }

The I/O system defines both byte and character stream classes However, the character stream classes are really just wrappers that convert an underlying byte stream to a character stream, handling any conversion automatically Thus, the character streams, while logically separate, are built upon byte streams All stream classes are defined within the SystemIO namespace To use these classes, you will usually include the following statement near the top of your program:

Now when the program is run, the following output is produced:

Inside Inside Inside Inside Inside MyMeth(int): 10 MyMeth(double): 101 MyMeth(byte): 99 MyMeth(int): 10 MyMeth(double): 115

using SystemIO;

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In this version, since there is a version of MyMeth( ) that takes a byte argument, when MyMeth( ) is called with a byte argument, MyMeth(byte) is invoked and the automatic conversion to int does not occur Both ref and out participate in overload resolution For example, the following defines two distinct and separate methods:

The reason that you don t have to specify SystemIO for console input and output is that the Console class is defined in the System namespace

public void MyMeth(int x) { ConsoleWriteLine("Inside MyMeth(int): " + x); } public void MyMeth(ref int x) { ConsoleWriteLine("Inside MyMeth(ref int): " + x); }

Thus,

The core stream class is SystemIOStream Stream represents a byte stream and is a base class for all other stream classes It is also abstract, which means that you cannot instantiate a Stream object directly Stream defines a set of standard stream operations Table 11-1 shows several commonly used methods defined by Stream Several of the methods shown in Table 11-1 will throw an IOException if an I/O error occurs If an invalid operation is attempted, such as attempting to write to a stream that is readonly, a NotSupportedException is thrown Other exceptions are possible, depending on the specific method Notice that Stream defines methods that read and write data However, not all streams will support both of these operations because it is possible to open read-only or write-only streams Also, not all streams will support position requests via Seek( ) To determine the capabilities of a stream, you will use one or more of Stream s properties They are shown in Table 11-2 Also shown are the Length and Position properties, which contain the length of the stream and its current position

obMyMeth(i)

obMyMeth(ref i)

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void Close( ) void Flush( ) int ReadByte( ) int Read(byte[ ] buf, int offset, int numBytes) long Seek(long offset, SeekOrigin origin) void WriteByte(byte b) int Write(byte[ ] buf, int offset, int numBytes)

invokes MyMeth(ref int x)

8:

Closes the stream Writes the contents of the stream to the physical device Returns an integer representation of the next available byte of input Returns 1 when the end of the file is encountered Attempts to read up to numBytes bytes into buf starting at buf [offset], returning the number of bytes successfully read Sets the current position in the stream to the specified offset from the specified origin Writes a single byte to an output stream Writes a subrange of numBytes bytes from the array buf, beginning at buf [offset] The number of bytes written is returned

Although ref and out participate in overload resolution, the difference between the two alone is not sufficient For example, these two versions of MyMeth( ) are invalid:

Several concrete byte streams are derived from Stream Those that are defined in the SystemIO namespace are shown here

// Wrong! public void MyMeth(out int x) { // public void MyMeth(ref int x) { //

.

Wraps a byte stream and adds buffering Buffering provides a performance enhancement in many cases A byte stream designed for file I/O A byte stream that uses memory for storage A byte stream that uses memory for storage, but is not suitable for mixed-language programming

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