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