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 How To Handle Checkboxes

Defining Checkboxes in a dialog

CHECKBOX "Fixed", ID_FIXED, 85, 36, 30, 12

Read the Checkbox's state

UINT IsDlgButtonChecked(
HWND hDlg, // handle to dialog box int nIDButton // button identifier
);

Change the Checkbox's state

BOOL CheckDlgButton(
HWND hDlg, // handle to dialog box int nIDButton, // button identifier UINT uCheck // check state
);

Possible Checkbox States

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

From winuser.h:

#define BST_CHECKED	1
#define BST_INDETERMINATE	2
#define BST_UNCHECKED	0

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