EnumWindowsProc callback function

An application-defined callback function used with the EnumWindows or EnumDesktopWindows function. It receives top-level window handles. The WNDENUMPROC type defines a pointer to this callback function. EnumWindowsProc is a placeholder for the application-defined function name.

BOOL CALLBACK EnumWindowsProc(
  _In_ HWND   hwnd,
  _In_ LPARAM lParam
);

• hwnd [in]
  A handle to a top-level window.

• lParam [in]
  The application-defined value given in EnumWindows or EnumDesktopWindows.

To continue enumeration, the callback function must return TRUE; to stop enumeration, it must return FALSE.

An application must register this callback function by passing its address to EnumWindows or EnumDesktopWindows.

Reference

EnumWindows

Conceptual

Windows

Other Resources

EnumDesktopWindows