The EM_GETEVENTMASK message retrieves the event mask for a rich edit control. The event mask specifies which notification messages the control sends to its parent window.
EM_GETEVENTMASK
wParam = 0; // not used; must be zero
lParam = 0; // not used; must be zero
Returns the event mask for the rich edit control.
Windows NT: Requires version 3.51 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in richedit.h.
Rich Edit Controls Overview, Rich Edit Messages