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Here, d1 is an object of type D_class1, which is derived using Base Thus, when d1 is created, first Base( ) is executed, then D_class1( ) is called It makes sense for constructors to be called in the same order in which the derivation takes place Because the base class has no knowledge of the derived class, any initialization it needs to perform is separate from and possibly prerequisite to any initialization performed by the derived class, so it must be executed first On the other hand, a destructor function in a derived class is executed before the destructor in the base The reason for this is also easy to understand Since the destruction of a base class object implies the destruction of the derived class object, the derived object s destructor must be executed before the base object is destroyed This program illustrates the order in which constructors and destructors are executed:

#include <iostream> using namespace std; class Base { public: Base() { cout << "\nBase created\n"; }

This code defines the four columns required to display photographs. We are now ready to populate the list view with the photos from a selected album. 14.5.3 POPULATING THE LISTVIEW This section completes the implementation of the LoadPhotoData method by creating the ListViewItem objects for the control. The following steps add an item to our control for each Photograph in the album, and define the subitems associated with each item. In the course of implementing support for photographs, we will need the Photograph object itself. We had a similar requirement for PhotoAlbum objects, and were able to use the file name setting to load the album into memory. While the file name is available for our photos as well, our PhotoAlbum class does not provide a good mechanism for locating a Photograph in an album based on the file name. The most convenient means for locating a specific photograph is based on the index. What we need, then, is a way to look up the index. This value will be stored in the Tag property for our list view item, in a manner similar to how we used this property for photo albums. Of course, an alternate technique here would be to derive a new class from the ListView class as we discussed at the end of section 14.4. The Tag property is fine for our purposes. In your application, you can use whichever technique seems appropriate for your current and expected requirements.

23:

261 474 949 139 2781 0 02 03 06 13 01 1 06 5 19 15 275

ADD THE PHOTOS IN AN ALBUM TO THE LIST Action 1 Modify the LoadPhotoData method to simply return if the given album is null or empty. Result

~Base() { cout << "Base destroyed\n\n"; } }; class D_class1 : public Base { public: D_class1() { cout << "D_class1 created\n"; } ~D_class1() { cout << "D_class1 destroyed\n"; } }; int main() { D_class1 d1; cout << "\n"; return 0; }

This program produces the following output:

private void LoadPhotoData(PhotoAlbum album) { . . . // Handle null or empty album if (album == null || album.Count == 0) return; // Load the photo items for (int i = 0; i < album.Count; i++) {

131 237 474 695 139 0 01 02 03 06 01 05 03 25 09 75 138

As you know, it is possible for a derived class to be used as a base class in the creation of another derived class When this happens, constructors are executed in the order of their derivation and destructors in the reverse order For example, consider this program, which uses D_class1 to derive D_class2:

to the index values. 3 4 Create a new ListViewItem for each photo. Assign the caption as the item label, and the image list index to our small photograph image. Add the subitem values.

#include <iostream> using namespace std; class Base { public: Base() { cout << "\nBase created\n"; } ~Base() { cout << "Base destroyed\n\n"; } }; class D_class1 : public Base { public:

Photograph photo = album[i]; ListViewItem item = new ListViewItem(); item.Text = photo.Caption; item.Tag = i; item.ImageIndex = MainForm.PhotoIndex; // Add the subitems item.SubItems.Add(photo. DateTaken.ToShortDateString()); item.SubItems.Add(photo.Photographer); item.SubItems.Add(photo.FileName);

D_class1() { cout << "D_class1 created\n"; } ~D_class1() { cout << "D_class1 destroyed\n"; } }; class D_class2 : public D_class1 { public: D_class2() { cout << "D_class2 created\n"; } ~D_class2() { cout << "D_class2 destroyed\n"; } }; int main() { D_class1 d1; D_class2 d2; cout << "\n"; return 0; }

65 119 237 348 695 0 0 01 02 03 0 03 02 13 05 38 69

The program produces this output:

a. Use the short date format for the Taken column. b. Also place the photo s index value in a hidden subitem. 6 Add the new item to the control.

Base created D_class1 created Base created D_class1 created D_class2 created D_class2 destroyed D_class1 destroyed Base destroyed D_class1 destroyed Base destroyed

listViewMain.Items.Add(item);

05 1 2 29 58 0 0 0 0 0 0 0 0 01 0 03 06