int CALLBACK EditWordBreakProc(
LPTSTR lpch, // pointer to edit text
int ichCurrent, // index of starting point
int cch, // length in characters of edit text
int code // action to take
);
Ejemplo:
....
SendMessage(hwndEdit,
EM_SETWORDBREAKPROC,
(WPARAM) 0,
(LPARAM) (EDITWORDBREAKPROC) WordBreakProc);
.....