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ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

Window Classes:

Window classes define the behavior of windows. Each class has its own
unique reaction to messages. Classes derive from other classes.

    NORMAL       base window for all window classes
    APPLICATION  application window. has the menu 
                 (derived from NORMAL)
    TEXTBOX      textbox. base window for listbox, editbox, etc.
                 (derived from NORMAL)
    LISTBOX      listbox. base window for menubar
                 (derived from TEXTBOX)
    PICTUREBOX   picturebox. a text box onto which you can draw lines
                 (derived from TEXTBOX)
    EDITBOX      editbox
                 (derived from TEXTBOX)
    MENUBAR      the application's menu bar
                 (derived from NORMAL)
    POPDOWNMENU  popdown menu
                 (derived from LISTBOX)
    BUTTON       command button in a dialog box
                 (derived from TEXTBOX)
    SPINBUTTON   spin button in a dialog box
                 (derived from LISTBOX)
    COMBOBOX	 combination editbox/listbox
		 (derived from EDITBOX)
    DIALOG       dialog box. parent to editbox, button, listbox, etc.
                 (derived from NORMAL)
    ERRORBOX     for displaying an error message
                 (derived from DIALOG)
    MESSAGEBOX   for displaying a message
                 (derived from DIALOG)
    HELPBOX      help window
                 (derived from DIALOG)
    TEXT         static text on a dialog box
                 (derived from TEXTBOX)
    RADIOBUTTON  radio button on a dialog box
                 (derived from TEXTBOX)
    CHECKBOX     check box on a dialog box
                 (derived from TEXTBOX)
    STATUSBAR    status bar at the bottom of application window
                 (derived from TEXTBOX)

               D-Flat Window Class Tree
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