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Notice that the program uses two try blocks The first catches any I/O exceptions that might prevent the file from being opened If an I/O error occurs, the program terminates Otherwise, the second try block monitors the read operation for I/O exceptions Thus, the second try block executes only if fin refers to an open file Also, notice that the file is closed in the finally block associated with the second try block This means that no matter how the do loop ends (either normally or because of an error), the file will be closed Although not an issue in this specific example (because the entire program ends at that point anyway), the advantage to this approach, in general, is that if the code that accesses a file terminates because of some exception, the file is still closed by the finally block This ensures that the file is closed in all cases In some situations, it may be easier to wrap the portions of a program that open the file and access the file within a single try block (rather than separating the two) For example, here is another, shorter way to write the ShowFile program:

// Display a text file Compact version using System;

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Part I:

using SystemIO; class ShowFile { static void Main(string[] args) { int i; FileStream fin = null; if(argsLength != 1) { ConsoleWriteLine("Usage: ShowFile File"); return; } // Use a single try block to open the file and then // read from it try { fin = new FileStream(args[0], FileModeOpen); // Read bytes until EOF is encountered do { i = finReadByte(); if(i != -1) ConsoleWrite((char) i); } while(i != -1); } catch(IOException exc) { ConsoleWriteLine("I/O Error:\n" + excMessage); } finally { if(fin != null) finClose(); } } }

Notice in this version that the FileStream reference fin is initialized to null If the file can be opened by the FileStream constructor, fin will be non-null If the constructor fails, fin will remain null This is important because inside the finally block, Close( ) is called only if fin is not null This mechanism prevents an attempt to call Close( ) on fin when it does not refer to an open file Because of its compactness, this approach is used by many of the I/O examples in this book Be aware, however, that it will not be appropriate in cases in which you want to deal separately with a failure to open a file, such as might occur if a user mistypes a filename In such a situation, you might want to prompt for the correct name, for example, before entering a try block that accesses the file In general, precisely how you manage the opening, accessing, and closing of a file will be determined by your specific application What works well in one case may not be appropriate for another Thus, you must tailor this process to best fit the exact needs of your program

I decided to keep the word problem at the end for emphasis, Brad said But replacing the rst reference to problems with the word issues and the second reference with the word events was a good move on my part, I think Weather, for example, is an event, not necessarily a problem

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To write a byte to a file, use the WriteByte( ) method Its simplest form is shown here: void WriteByte(byte value) This method writes the byte specified by value to the file If the underlying stream is not opened for output, a NotSupportedException is thrown If the stream is closed, ObjectDisposedException is thrown

14:

You can write an array of bytes to a file by calling Write( ) It is shown here: void Write(byte[ ] array, int offset, int count)