BM_GETCHECK

An application sends a BM_GETCHECK message to retrieve the check state of a radio button or check box. 

BM_GETCHECK 
wParam = 0;     // not used; must be zero 
lParam = 0;     // not used; must be zero

Parameters

This message has no parameters.

Return Values

The return value from a button created with the BS_AUTOCHECKBOX, BS_AUTORADIOBUTTON, BS_AUTO3STATE, BS_CHECKBOX, BS_RADIOBUTTON, or BS_3STATE style can be one of the following:

Value Meaning
BST_CHECKED Button is checked.
BST_INDETERMINATE Button is grayed, indicating an indeterminate state (applies only if the button has the BS_3STATE or BS_AUTO3STATE style).
BST_UNCHECKED Button is unchecked

If the button has any other style, the return value is zero.

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_GETSTATE, BM_SETCHECK