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.
See Also