EM_SETEVENTMASK  1U9A00J 

The EM_SETEVENTMASK message sets the event mask for a rich edit control. The event mask specifies which notification messages the control sends to its parent window.

EM_SETEVENTMASK

wParam = 0;

lParam = (LPARAM) (DWORD) dwMask;

Parameters

dwMask

New event mask for the rich edit control.

Return Values

Returns the previous event mask.

Remarks

The default event mask (before any is set) is ENM_NONE.