EN_MAXTEXT
idEditControl = LOWORD(wParam);
hwndEditControl = (HWND)lParam;
The EN_MAXTEXT notification message is sent when the current insertion has exceeded the specified number of characters for the edit control. The insertion has been truncated.
idEditControl
Value of low word of wParam. Specifies the edit-control ID.
hwndEditControl
Value of lParam. Specifies the edit-control window handle.
WM_COMMAND