SetSel(start, end)
Sets the selection in the edit control.
Parameters
start : int
Specifies the starting position.
If start is 0 and end is -1, all the text in the edit control is selected.
If start is -1, any current selection is removed.end=start : int
Specifies the ending position.
Alternative Parameters
start,end)
As for normal start, end args.
MFC References
CRichEditCtrl::SetSel