hab (HAB) - input

Anchor-block handle.

pszClassName (PSZ) - input

Window-class name.

An application-specified class name.

pfnWndProc (PFNWP) - input

Window-procedure identifier.

Can be NULL if the application does not provide its own window procedure.

flStyle (ULONG) - input

Default-window style.

This can be any of the standard class styles (CS_*) in addition to any class-specific styles that are defined. These styles can be augmented when a window of this class is created.

A public window class is created if the CS_PUBLIC style is specified, otherwise a private class is created. The CS_PUBLIC style must only be specified for the shell process.

Public classes are available for creating windows from any process. Private classes are only available to the registering process.

cbWindowData (ULONG) - input

Reserved storage.

This is the number of bytes of storage reserved per window created of this class for application use.

rc (BOOL) - returns

Window-class-registration indicator.

TRUE

Window class successfully registered
FALSE
Window class not successfully registered.

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