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Write( ) writes count bytes from the array array, beginning at array[offset], to the file If an error occurs during writing, an IOException is thrown If the underlying stream is not opened for output, a NotSupportedException is thrown Several other exceptions are also possible As you may know, when file output is performed, often that output is not immediately written to the actual physical device Instead, output is buffered by the operating system until a sizable chunk of data can be written all at once This improves the efficiency of the system For example, disk files are organized by sectors, which might be anywhere from 128 bytes long, on up Output is usually buffered until an entire sector can be written all at once However, if you want to cause data to be written to the physical device whether the buffer is full or not, you can call Flush( ), shown here: void Flush( ) An IOException is thrown on failure If the stream is closed, ObjectDisposedException is thrown Once you are done with an output file, you must remember to close it This can be done by calling Close( ) Doing so ensures that any output remaining in a disk buffer is actually written to the disk Thus, there is no reason to call Flush( ) before closing a file Here is a simple example that writes to a file:

(f) We rewrite the limit as limx 0 e 1/x /[1/x] Since limx 0 e 1/x = opital s Rule applies Thus limx 0 1/x = + , l H

// Write to a file using System; using SystemIO; class WriteToFile { static void Main(string[] args) { FileStream fout = null; try { // Open output file fout = new FileStream("testtxt", FileModeCreateNew); // Write the alphabet to the file for(char c = 'A'; c <= 'Z'; c++) foutWriteByte((byte) c); } catch(IOException exc) { ConsoleWriteLine("I/O Error:\n" + excMessage); } finally { if(fout != null) foutClose(); } } }

The program first creates a file called testtxt for output by using FileModeCreateNew This means that the file must not already exist (If it does exist, an IOException will be thrown) After the file is open, the uppercase alphabet is written to the file Once this program executes, testtxt will contain the following output:

Part I:

4 We do (a), (b), (c), (d)

One advantage to the byte-oriented I/O used by FileStream is that you can use it on any type of file not just those that contain text For example, the following program copies any type of file, including executable files The names of the source and destination files are specified on the command line

Consistency is a hallmark of professionalism From bulleted lists to sentence structure, it s important that your writing adhere to the principles of parallel construction that were discussed in Five

/* Copy a file one byte at a time To use this program, specify the name of the source file and the destination file For example, to copy a file called FIRSTDAT to a file called SECONDDAT, use the following command line: CopyFile FIRSTDAT SECONDDAT */ using System; using SystemIO; class CopyFile { static void Main(string[] args) { int i; FileStream fin = null; FileStream fout = null; if(argsLength != 2) { ConsoleWriteLine("Usage: CopyFile From To"); return; } try { // Open the files fin = new FileStream(args[0], FileModeOpen); fout = new FileStream(args[1], FileModeCreate); // Copy the file do { i = finReadByte(); if(i != -1) foutWriteByte((byte)i); } while(i != -1); } catch(IOException exc) { ConsoleWriteLine("I/O Error:\n" + excMessage); } finally { if(fin != null) finClose(); if(fout != null) foutClose(); } } }

14:

Although byte-oriented file handling is quite common, it is possible to use character-based streams for this purpose The advantage to the character streams is that they operate directly on Unicode characters Thus, if you want to store Unicode text, the character streams are certainly your best option In general, to perform character-based file operations, you will wrap a FileStream inside either a StreamReader or a StreamWriter These classes automatically convert a byte stream into a character stream, and vice versa Remember, at the operating system level, a file consists of a set of bytes Using a StreamReader or StreamWriter does not alter this fact StreamWriter is derived from TextWriter StreamReader is derived from TextReader Thus, StreamWriter and StreamReader have access to the methods and properties defined by their base classes

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