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The application is now ready. The startup object specified here is used by the C# compiler to establish the entry point for the application, and is only required if there are multiple Main methods in your project. On the command-line, the C# compiler accepts the /main switch to specify the class containing the Main method to use as the application s entry point. Run the application to verify that the ParentForm window appears and the New menu can be used to create MainForm objects as child windows. If you explore this new application, you will find some rather peculiar behavior for some of the controls. We will discuss and address these issues throughout the remainder of this chapter.

for(i=0; i<10; i++) p[i] = 10000 + i; // display the contents of the array for(i=0; i<10; i++) cout << p[i] << " "; delete [] p; // delete the entire array return 0; }

As stated, you can allocate memory for any valid type This includes objects A dynamically created object acts just like any other object When it is created, its constructor (if it has one) is called When the object is freed, its destructor is executed For example, in this program, new allocates memory for an object of type three_d:

widescreen 16:9 aspect ratios (10/1995)

TRY IT!

#include <iostream> #include <new> using namespace std; class three_d { public: int x, y, z; // 3-d coordinates three_d(int a, int b, int c); ~three_d() { cout << "Destructing\n"; } } ; three_d::three_d(int a, int b, int c) { cout << "Constructing\n"; x = a; y = b; z = c; } // Display X, Y, Z coordinates - three_d inserter ostream &operator<<(ostream &stream, three_d &obj) { stream << objx << ", "; stream << objy << ", "; stream << objz << "\n";

Of course, the MyPhotos Property Pages dialog used in step 2 can also be used to set the Startup Object to the MyPhotos.MainForm class. When this is done, the application displays the familiar single document interface created in part 2 of this book. Make this change and run the application to observe this behavior.

return stream; } int main() { three_d *p;

International Programme Exchange (2002-04) [1080-line video]

Among the odd features you may notice in the MDI version of this application is the menu bar. In particular, there are two File menus when a MainForm window is displayed. Adjusting this behavior is our next topic. 534

try { p = new three_d (5, 6, 7); } catch(bad_alloc xa) { cout << "Allocation failure\n"; return 1; } cout << *p; delete p; return 0; }

#include <iostream> #include <new> using namespace std;

By definition, an MDI application permits multiple windows to be displayed Each child window may be the same or different, and each may display different information about one or more objects It would be nice if the menu items for the application could be customized depending on which child window is displayed Exactly how to do this is the subject of this section As an example, consider a car-buying application that permits users to search for, display, and purchase used cars As an MDI application, this might display a photograph of the car in one window, standard features and warranty information in another window, and optional packages and pricing information in a third window Clearly the set of menus and the contents of each menu should differ depending on which style window is currently active.

class three_d { public: int x, y, z; // 3-d coordinates three_d(int a, int b, int c) ; three_d(){ x=y=z=0; cout << "Constructing\n"; } // needed for arrays ~three_d() { cout << "Destructing\n"; } }; three_d::three_d(int a, int b, int c) { cout << "Constructing\n";

j A/53: ATSC Digital Television Standard, Parts 1-6, 2007 j A/65: ATSC Program and System Information Protocol for Terrestrial Broadcast and

For instance, menus for the photograph window might permit different colors to be viewed or different parts of the vehicle to be shown These concepts make no sense for the other windows, and should not be accessible when these windows are active While our application is not quite so ambitious, we do have the problem of our File menu, since both the ParentForm and the MainForm class contain this item Once we make the two File menus merge, we also have to deal with the contents of these menus, to ensure the items appear in an appropriate order The Menu class provides a MergeMenu method for merging two menus together This method accepts a Menu object and merges it with the calling Menu object.