EM_HIDESELECTION Overview Group

The EM_HIDESELECTION message hides or shows the selection in a rich edit control.

EM_HIDESELECTION 

wParam = (WPARAM) (BOOL) fHide; 

lParam = (LPARAM) (BOOL) fChangeStyle;

Parameters

fHide: Value specifying whether to hide or show the selection. If this parameter is zero, the selection is shown. Otherwise, the selection is hidden.
fChangeStyle: Value specifying whether to change the control’s ES_NOHIDESEL window style. If this parameter is zero, the selection is temporarily shown or hidden. Otherwise, the style is changed.
If this parameter is nonzero and the control has the focus, the selection is hidden or shown as appropriate.

No return value.