BM_SETCHECK Overview  Group

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.

See Also

BM_GETCHECK, BM_GETSTATE, BM_SETSTATE