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With an explanation of versions and the renaming of our main form out of the way, we can get back to the topic of placing controls on our form.

// Assign a string to an object str_type str_type::operator=(char *str) { str_type temp; strcpy(string, str); strcpy(tempstring, string); return temp; } // Add a string to an object str_type str_type::operator+(char *str) { str_type temp; strcpy(tempstring, string); strcat(tempstring, str); return temp; }

22:

The Toolbox window Finally, we are ready to insert the controls onto the form. In future chapters, we will not include the excruciating details of adding controls to forms and setting their properties with the Forms Designer, so make sure you understand the process here. If you recall, in chapter 1 we inserted a Button and a PictureBox on our form. We will do the same here using Visual Studio.

6-48

Look carefully at these functions Notice that the right-side argument is not an object of type str_type but rather a pointer to a character array that is, a null-terminated string However, notice that both functions return an object of type str_type Although the functions could, in theory, have returned some other type, it makes the most sense to return an object, since the targets of these operations are also objects The advantage to defining string operations that accept null-terminated strings as the right-side operand is that it allows some statements to be written in a natural way For example, these are now valid statements:

ADD THE CONTROLS TO OUR FORM Action 1 2 Click the MainForm.cs [Design] tab. Click the Toolbox tab on the upper left side of the window. Note: Your Toolbox may appear on the right or left, depending on your settings. If the Toolbox tab is not visible, select the Toolbox item from the View menu. Result The Windows Form Designer appears, displaying our blank form. The Toolbox window appears.

str_type a, b, c; a = "hi there"; // assign an object a string c = a + " George"; // concatenate an object with a string

Note: The order of controls in your window may be different than what you see here. The contents of this window can be customized, and new controls can be added. Look up toolbox, customizing in the online documentation for more details on this latter point. 3 4 Click the Button item in the Toolbox window. Click the blank form. The Button item is now highlighted. A new Button object appears on the form.

The following program incorporates the additional meanings for the + and = operators and illustrates their use

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// Expanding the string type #include <iostream> #include <cstring> using namespace std; class str_type { char string[80]; public: str_type(char *str = "\0") { strcpy(string, str); } str_type operator+(str_type str); str_type operator+(char *str); str_type operator=(str_type str); str_type operator=(char *str); void show_str() { cout << string; } } ; str_type str_type::operator+(str_type str) { str_type temp; strcpy(tempstring, string); strcat(tempstring, strstring); return temp;

Regardless of how items are activated, an ItemActivate event occurs whenever an item is activated. The event handler for this event receives a standard System.EventArgs parameter, so the activated item is obtained from the SelectedItems collection. The activation behavior for our MyAlbumExplorer application will display the Photographs in the selected album. This is a rather complicated change, since the columns and list item behavior must now accommodate the display of both albums and photos here. The fact that we were careful to separate much of the album logic into individual methods along the way will help us keep our code straight. Figure 14.6 shows our application with photographs displayed in the ListView control. These photographs are sorted by the date each photo was taken. The icon used here might not be your first choice for a photograph icon, but it will suffice for our purposes. If you find another icon you prefer, or are feeling creative, you can use an alternate icon in your application.

} str_type str_type::operator=(str_type str) { strcpy(string, strstring); return *this; } str_type str_type::operator=(char *str) { str_type temp; strcpy(string, str); strcpy(tempstring, string); return temp; } str_type str_type::operator+(char *str) { str_type temp; strcpy(tempstring, string); strcat(tempstring, str); return temp; } int main() { str_type a("Hello "), b("There"), c; c = a + b; cshow_str(); cout << "\n"; a = "to program in because"; ashow_str(); cout << "\n"; b = c = "C++ is fun"; c = c+" "+a+" "+b; cshow_str(); return 0; }