BM_SETCHECK

An application sends a BM_SETCHECK message to set the check state of a radio button or check box.

BM_SETCHECK 
wParam = (WPARAM) fCheck; // check state 
lParam = 0;               // not used; must be zero 
 

Parameters

fCheck

Value of wParam. Specifies the check state. This parameter can be one of the following values:

Value	Meaning
BST_CHECKED	Sets the button state to checked.
BST_INDETERMINATE	Sets the button state to grayed, indicating an indeterminate state. Use this value only if the button has the BS_3STATE or BS_AUTO3STATE style.
BST_UNCHECKED	Sets the button state to unchecked

Return Values

This message always returns zero.

Remarks

The BM_SETCHECK message has no effect on push buttons.

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

Buttons Overview, Button Messages, BM_GETCHECK, BM_GETSTATE, BM_SETSTATE