EnumWindows

The EnumWindows function enumerates all top-level windows on the screen by passing the handle to each window, in turn, to an application-defined callback function. EnumWindows continues until the last top-level window is enumerated or the callback function returns FALSE.

BOOL EnumWindows(
  WNDENUMPROC lpEnumFunc,  // pointer to callback function
  LPARAM lParam            // application-defined value
);
 

Parameters

lpEnumFunc

Pointer to an application-defined callback function. For more information, see EnumWindowsProc.

lParam

Specifies an application-defined value to be passed to the callback function.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

The EnumWindows function does not enumerate child windows.

This function is more reliable than calling the GetWindow function in a loop. An application that calls GetWindow to perform this task risks being caught in an infinite loop or referencing a handle to a window that has been destroyed.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in winuser.h.
  Import Library: Use user32.lib.

See Also

Windows Overview, Window Functions, EnumChildWindows, EnumWindowsProc, GetWindow