BM_QUERYCHECKINDEX (1.2)
◄Message Group► ◄Overview► ◄Up► ◄Next► ◄Previous►
────────────────────────────────────────────────────────────────────────────
#define INCL_WINBUTTONS
BM_QUERYCHECKINDEX
mp1 = 0L; /* not used, must be zero */
mp2 = 0L; /* not used, must be zero */
An application sends the BM_QUERYCHECKINDEX message to determine the
zero-based index of a checked radio button. It can be sent to any radio
button or auto-radio button within a group. The button window responds to
this message by returning the zero-based index of the checked radio button.
This message does not use any parameters.
Return Value
The return value is the radio-button index if the operation is successful or
-1 if no radio button in the group is checked or if the button control does
not have the style BS_RADIOBUTTON or BS_AUTORADIOBUTTON.
See Also
BM_QUERYCHECK
♦