Manipulating Controls

One way dialog boxes manipulate their controls is by sending them messages using member functions inherited from TWindow, with a control message like LB_ADDSTRING.

Control objects greatly simplify this process by providing member functions that send control messages for you.

TListBox::AddString(), for example, takes a string as its parameter and adds it to the list box by calling the list box object's HandleMessage member function:

int TListBox::AddString(const char far* str)
{
 return (int)HandleMessage(LB_ADDSTRING, 0, (LPARAM)str);
}

This example shows how you can call the control objects' member functions via a pointer:

ListBox1->AddString("Atlantic City");
//ListBox1 is a TListBox *

See Also

• Making a Window Act Like a Dialog Box