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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( ).

20.1.5 Popping up Windows Forms dialogs Another scenario for using existing Windows Forms functionality is one where you have an entire dialog already set up, and you want to use it in its entirety. As an example, we ll create a Windows Forms Form to display our results when the user hits the Accept button (figure 20.8). To bring this up as a modal dialog, we do exactly what we would have done in a classic Windows Forms application.

25:

// 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; }

8

private void button1_Click(object sender, RoutedEventArgs e) { string name = textBox1.Text; DateTime born = birthday.Value; MyWindowsFormsLibrary.BirthdayDetails dlg = new MyWindowsFormsLibrary.BirthdayDetails(); dlg.SetDetails(name + " was born on " + born.ToLongDateString()); dlg.ShowDialog(); }

This program displays the following output:

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

We ve added a method to our dialog called SetDetails() to populate the details text. The big thing is that we call ShowDialog() and the dialog pops up. It will even automatically stay on top of our main window until we dismiss it. We can also make the dialog modeless by calling Show() instead of ShowDialog().

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