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DISPLAY PHOTOGRAPH IN A PICTUREBOX CONTROL (continued) Action 2 In the MainForm.cs code window, add a new DisplayPhoto method. Note: We will use the Tag property for the PictureBox control to hold the photo to display, if any.

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private void DisplayPhoto(TreeNode node) { if (node == null) { pictureBoxMain.Visible = false; listViewMain.Visible = true; return; } // Parent of photo node is album node string file = node.Parent.Tag as string; if (_album == null || (_album.FileName != file)) { if (_album != null) _album.Dispose(); _album = OpenTreeAlbum(node.Parent); } if (_album != null) { // Proper PhotoAlbum is now open pictureBoxMain.Tag = _album[node.Index]; pictureBoxMain.Invalidate(); pictureBoxMain.Visible = true; listViewMain.Visible = false; } } private static Pen borderPen = new Pen(SystemColors.WindowFrame);

follows the try statement that throws the exception The general form of try and catch are shown here try { // try block } catch (type1 arg) { // catch block } catch (type2 arg) { // catch block } catch (type3 arg) { // catch block } catch (typeN arg) { // catch block } The try block must contain that portion of your program that you want to monitor for errors This can be as short as a few statements within one function or as all-encompassing as enclosing the main( ) function code within a try block (which effectively causes the entire program to be monitored) When an exception is thrown, it is caught by its corresponding catch statement, which processes the exception There can be more than one catch statement associated with a try Which catch statement is used is determined by the type of the exception That is, if the data type specified by a catch matches that of the exception, then that catch statement is executed (and all others are bypassed) When an exception is caught, arg will receive its value Any type of data may be caught, including classes that you create If no exception is thrown (that is, no error occurs within the try block), then no catch statement is executed The general form of the throw statement is shown here throw exception; throw must be executed either from within the try block, proper, or from any function called (directly or indirectly) from within the try block exception is the value thrown If you throw an exception for which there is no applicable catch statement, an abnormal program termination may occur Throwing an unhandled exception causes the terminate( ) function to be invoked By default, terminate( ) calls abort( ) to stop your program However, you may specify your own handlers if you like, using set_terminate( ).

25:

B-25

a. If the given node is null, hide the picture box and display the ListView control. b. If a node was given, ensure the PhotoAlbum containing the photo is open. c. Assign the Photograph to display to the PictureBox.Tag property. d. Make the PictureBox visible.

// A simple exception handling example #include <iostream> using namespace std; int main() { cout << "Start\n"; try { // start a try block cout << "Inside try block\n"; throw 100; // throw an error cout << "This will not execute"; } catch (int i) { // catch an error cout << "Caught an exception -- value is: "; cout << i << "\n"; } C++ cout << "End"; return 0; }

Create a Pen object in the MainForm class for drawing a border around a photo. Add a Paint event handler for the PictureBox control to draw the assigned Photograph in the PictureBox client area with the proper aspect ratio.

This program displays the following output:

Table B10 ISO 639 Language Codes (continued)

private void pictureBoxMain_Paint (object sender, System.Windows. Forms.PaintEventArgs e) { Photograph photo = pictureBoxMain.Tag as Photograph; if (photo == null) { // Something is wrong, give up e.Graphics.Clear(pictureBoxMain. BackColor); return; } // Paint the photograph Rectangle rect = photo.ScaleToFit( pictureBoxMain.ClientRectangle); e.Graphics.DrawImage(photo.Image, rect); e.Graphics.DrawRectangle(borderPen, rect); }