EM_SETREADONLY

An application sends an EM_SETREADONLY message to set or remove the read-only style (ES_READONLY) of an edit control.

EM_SETREADONLY 
wParam = (WPARAM) (BOOL) fReadOnly;  // read-only flag 
lParam = 0;                          // not used; must be zero 
 

Parameters

fReadOnly

Value of wParam. Specifies whether to set or remove the ES_READONLY style. A value of TRUE sets the ES_READONLY style; a value of FALSE removes the ES_READONLY style.

Return Values

If the operation succeeds, the return value is nonzero; otherwise, it is zero.

Remarks

When an edit control has the ES_READONLY style, the user cannot change the text within the edit control.

To determine whether an edit control has the ES_READONLY style, use the GetWindowLong function with the GWL_STYLE flag.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in winuser.h.

See Also

Edit Controls Overview, Edit Control Messages, GetWindowLong