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Look carefully at this program As you can see, there is a try block containing three statements and a catch(int i) statement that processes an integer exception Within the try block, only two of the three statements will execute: the first cout statement and the throw Once an exception has been thrown, control passes to the catch expression and the try block is terminated That is, catch is not called Rather, program execution is transferred to it (The program s stack is automatically reset as needed to accomplish this) Thus, the cout statement following the throw will never execute Usually, the code within a catch statement attempts to remedy an error by taking appropriate action If the error can be fixed, then execution will continue with the

statements following the catch However, sometimes an error cannot be fixed and a catch block will terminate the program with a call to exit( ) or abort( ) As mentioned, the type of the exception must match the type specified in a catch statement In the preceding example, for example, if you change the type in the catch statement to double, then the exception will not be caught and abnormal termination will occur This change is shown here

a. Retrieve the Photograph object stored in the picture box. b. If a photograph is not found, simply clear the client area. c. Otherwise, use the ScaleToFit method to determine the proper drawing rectangle. d. Draw the assigned image into this rectangle. e. Draw a border around the image using the Pen object created in the previous step.

// This example will not work #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 (double i) { // Won't work for an int exception cout << "Caught an exception -- value is: "; cout << i << "\n"; } cout << "End"; return 0; }

639-2/T que raj rap rar roa roh rom ron run rup* rus sad sag sah sai sal sam san sas sat scn* sco sel sem sga sgn* shn sid sin sio sit sla slk slv sma* sme* smi smj* smn* smo sms* sna snd snk 639-1 qu Hex 5155 Dec 8185 Language Name Quechua Rajasthani Rapanui Rarotongan; Cook Islands Maori Romance Romansh Romany Romanian Rundi Aromanian; Arumanian; Macedo-Romanian Russian Sandawe Sango Yakut South American Indian Salishan languages Samaritan Aramaic Sanskrit Sasak Santali Sicilian Scots Selkup Semitic Irish, Old (to 900) Sign Languages Shan Sidamo Sinhala; Sinhalese Siouan languages Sino-Tibetan Slavic Slovak Slovenian Southern Sami Northern Sami Sami languages Lule Sami Inari Sami Samoan Skolt Sami Shona Sindhi Soninke

DISPLAY PHOTOGRAPH IN A PICTUREBOX CONTROL (continued) Action 5 Update the AfterSelect event handler to use the new DisplayPhoto method to ensure the proper control is visible. Result

This program produces the following output because the integer exception will not be caught by the catch(double i) statement

An exception can be thrown from a statement that is outside a try block as long as it is within a function that is called from within the try block For example, this is a valid program

private void treeViewMain_AfterSelect(. . .) { . . . if (node.Parent == null) { // Bad tag or top-level node. LoadAlbumData(fileName); DisplayPhoto(null); } else if (Path.GetExtension(fileName) . . .) { // Album node selected PhotoAlbum album = OpenTreeAlbum(. . .); LoadPhotoData(album); DisplayPhoto(null); } else // must be a photograph { // Clear the list and display the photo listViewMain.Clear(); DisplayPhoto(node); } } private void pictureBoxMain_Resize (object sender, System.EventArgs e) { // Force the entire control to repaint pictureBoxMain.Invalidate(); }

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Add a Resize event handler for the PictureBox control to force the control to redraw the entire image when it is resized.

/* Throwing an exception from a function outside the try block */ #include <iostream> using namespace std; void Xtest(int test) { cout << "Inside Xtest, test is: " << test << "\n"; if(test) throw test; } int main() { cout << "Start\n"; try { // start a try block cout << "Inside try block\n"; Xtest(0); Xtest(1); Xtest(2); } catch (int i) { // catch an error cout << "Caught an exception -- value is: "; cout << i << "\n"; } cout << "End"; return 0; }