A public window class is one that has a reentrant window procedure that is registered and resides in a dynamic link library (DLL); it can be used by any process in the system to create windows. The operating system provides several preregistered public window classes. You can specify the system-provided window classes by using the symbolic identifiers that have the prefix WC_, as shown in the following table:
旼컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿎lass Name 쿏escription � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_BUTTON 쿎onsists of buttons and boxes the user can � � 퀂elect by clicking the pointing device or � � 퀅sing the keyboard. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_CONTAINER 쿎reates a control for the user to group � � 쿽bjects in a logical manner. A container can� � 쿭isplay those objects in various formats or � � 퀆iews. The container control supports drag � � 쿪nd drop so the user can place information in� � 쿪 container by simply dragging and dropping. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_ENTRYFIELD 쿎onsists of a single line of text that the � � 퀅ser can edit. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_FRAME 쿌 window class that can contain child windows� � 쿽f many of the other window classes. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_LISTBOX 쿛resents a list of text items from which the � � 퀅ser can make selections. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_MENU 쿛resents a list of items that can be � � 쿭isplayed horizontally as menu bars, or � � 퀆ertically as pull-down menus. Menus usually� � 쿪re used to provide a command interface to � � 쿪pplications. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_NOTEBOOK 쿎reates a control for the user that is � � 쿭isplayed as a number of pages. The top page� � 쿶s visible, and the others are hidden, with � � 퀃heir presence being indicated by a visible � � 쿮dge on each of the back pages. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_SCROLLBAR 쿗ets the user scroll the contents of an � � 쿪ssociated window. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_SLIDER 쿎reates a control that is usable for � � 쿾roducing approximate (analog) values or � � 쿾roperties. Scroll bars were used for this � � 쿯unction in the past, but the slider provides� � 쿪 more flexible method of achieving the same � � 퀁esult, with less programming effort. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_SPINBUTTON 쿎reates a control that presents itself to the� � 퀅ser as a scrollable ring of choices, giving � � 퀃he user quick access to the data. The user � � 쿶s presented only one item at a time, so the � � 퀂pin button should be used with data that is � � 쿶ntuitively related. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_STATIC 쿞imple display items that do not respond to � � 쿸eyboard or pointing device events. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_TITLEBAR 쿏isplays the window title or caption and lets� � 퀃he user move the window's owner. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_VALUESET 쿎reates a control similar in function to the � � 퀁adio buttons but provides additional � � 쿯lexibility to display graphical, textual, � � 쿪nd numeric formats. The values set with � � 퀃his control are mutually exclusive. � 읕컴컴컴컴컴컴컴좔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴�
With the exception of WC_FRAME, the system-provided window classes are known as control window classes because they give the user an easy means of controlling specific types of interaction. For example, the WC_BUTTON class allows single or multiple selections. These windows conform to the IBM* Systems Application Architecture (SAA) Common User Access (CUA) definition. They are designed specifically to provide function that meets the needs for a graphics-based standard user interface. The code fragments provided in this guide make extensive use of the system window classes.