EM_EXSETSEL Overview  Group

The EM_EXSETSEL message selects a range of characters and/or OLE objects in a rich edit control.

EM_EXSETSEL 

wParam = 0; 

lParam = (LPARAM) (CHARRANGE FAR *) ichCharRange; 

 

Parameters

ichCharRange

Zero-based index of the character.

Return Values

Returns the zero-based index of the line.

Comments:

• sendmessage Byref or Byval error
  hi all,
  
  in vb, sometimes you use sendmessage to read and sometimes to write info.
  if you want to use for reading you must use Byref, but if you want to write you must use byval
  It was making me mad, somethig working and something not...
  so:
  
  'to read
  Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByRef wParam As Long, ByRef lParam As Any) As Long
  'to write
  Private Declare Function SendMessageA Lib "user32" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Any) As Long
  Private Const WM_SETTEXT = &HC
  Private Const EM_SETSEL = &HB1
  Private Const EM_GETSEL = &HB0
  Private Const EM_REPLACESEL = &HC2
  Private Const EM_EXLIMITTEXT = &HD5
  Private Const EM_GETSELTEXT = &H43E
  Private Const EM_GETTEXT = &HD
  
  and for example you can now see that both of those codes work:
  
  SendMessageA txtBox.hwnd, EM_SETSEL, (start_sel), (end_sel)
  
  and
  
  SendMessage txtBox.hwnd, EM_GETSEL, l_startsel, l_endsel