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SAVE A PHOTO S SETTINGS ONLY WHEN NECESSARY Action 12 Create a variable to hold whether the notes value has changed. Modify the SetOriginals method to reset this variable. Result

FileStream defines two methods that read bytes from a file: ReadByte( ) and Read( ) To read a single byte from a file, use ReadByte( ), whose general form is shown here: int ReadByte( ) Each time it is called, it reads a single byte from the file and returns it as an integer value It returns 1 when the end of the file is encountered Possible exceptions include NotSupportedException (the stream is not opened for input) and ObjectDisposedException (the stream is closed) To read a block of bytes, use Read( ), which has this general form: int Read(byte[ ] buf, int offset, int numBytes) Read( ) attempts to read up to numBytes bytes into buf starting at buf [offset] It returns the number of bytes successfully read An IOException is thrown if an I/O error occurs Several other types of exceptions are possible, including NotSupportedException, which is thrown if reading is not supported by the stream The following program uses ReadByte( ) to input and display the contents of a text file, the name of which is specified as a command-line argument Note the program handles two errors that might occur when this program is first executed: the specified file not being found or the user forgetting to include the name of the file

/* Display a text file To use this program, specify the name of the file that you want to see For example, to see a file called TESTCS, use the following command line ShowFile TESTCS */ using System; using SystemIO; class ShowFile { static void Main(string[] args) {

private bool _modifiedTxtNotes;

14:

protected void SetOriginals() { . . . if (photo != null) { . . . _modifiedTxtNotes = false; } } private void txtNotes_TextChanged (object sender, System.EventArgs e) { if (txtNotes.Focused) _modifiedTxtNotes = true; } protected bool NewControlValues() { bool result = ((_origCaption != txtCaption.Text) || (_origDateTaken != dtpDateTaken.Value) || (_origPhotographer != cmbxPhotographer.Text) || (_modifiedTxtNotes)); return result; }

int i; FileStream fin;

if(argsLength != 1) { ConsoleWriteLine("Usage: ShowFile File"); return; } try { fin = new FileStream(args[0], FileModeOpen); } catch(IOException exc) { ConsoleWriteLine("Cannot Open File"); ConsoleWriteLine(excMessage); return; } // Read bytes until EOF is encountered do { try { i = finReadByte(); } catch(IOException exc) { ConsoleWriteLine("Error Reading File"); ConsoleWriteLine(excMessage); break; } if(i != -1) ConsoleWrite((char) i); } while(i != -1); finClose(); } }

Add a TextChanged event handler for the Notes text box to update this variable whenever the user changes the text. Create a NewControlValues method to determine if any of photograph s controls have been modified.

To write a byte to a file, use the WriteByte( ) method Its simplest form is shown here: void WriteByte(byte val) This method writes the byte specified by val to the file If the underlying stream is not opened for output, a NotSupportedException is thrown If the stream is closed, ObjectDisposedException is thrown You can write an array of bytes to a file by calling Write( ) It is shown here: void Write(byte[ ] buf, int offset, int numBytes) Write( ) writes numBytes bytes from the array buf, beginning at buf [offset], to the file The number of bytes written is returned 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

16 17

Part I: