How Windows Locates a Class
Windows maintains a list of structures for each of the three types of window
classes. When an application calls the CreateWindow
function to create a window with a specified class, Windows uses the
following procedure to locate the class:
- Windows searches the list of application local classes for a class with the
specified name. Note that several application instances can use the same name to
register local classes. Windows uses instance handles to differentiate among
local classes that have the same name.
- If the name is not in the application local class list, Windows searches the
list of application global classes.
- If the name is not in the application global class list, Windows searches the
list of system global classes.
All windows created by the application use this procedure, including windows
created by Windows on the application's behalf, such as dialog boxes. It is
possible to override system global classes without affecting other applications.
That is, an application can register an application local class having the same
name as a system global class. This replaces the system global class in the
context of the application but does not prevent other applications from using the
system global class.
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