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NOTE
NOTE
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if (!AboutBox->Handle) {
AboutBox = new TAboutBox(this);
AboutBox->SetParent(this);
}
aboutBox->ShowModal();
This code checks to see if the form has already been created. If it has not, the object is created
and then the ShowModal() method is called. This code also calls SetParent() to set the parent
of the form to the calling form (the main form, in most cases). It’s up to you to decide which
method you use, but I prefer the former.
Each time you create a form in the Form Designer, C++Builder creates
a pointer to the form. If you allow C++Builder to auto-create a form,
you don’t have to worry about the pointer being valid. If you choose
not to have a form auto-created, the pointer to the form will be NULL
until you explicitly create the form and initialize the pointer. If you
forget and use the pointer before it is initialized, Windows will generate
an access-violation error.
Okay, so back to the Project Options dialog box. The Auto-create forms list box contains a
list of the forms that will be auto-created. If you do not want a form to be auto-created, drag
the form from the Auto-create forms list box to the Available forms list box. You can move
forms from one list box to the other using drag-and-drop, too. To move several forms at one
time, simply select the forms you want to move (both list boxes support multiple selection)
and drag-and-drop them all at once. It’s as easy as that.
You can use the buttons between the two list boxes to move forms from
one list box to the other, but it’s usually easier to use drag-and-drop.
The Application Page
The Application page of the Project Options dialog box is very simple. (See Figure 10.8.)
The Title field on this page is used to set the title of the application. The title is the text that
will appear on the Windows taskbar when your application is minimized.
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