BM_QUERYCHECKINDEX - Parameters

ulReserved (ULONG)

Reserved value, should be 0.

ulReserved (ULONG)

Reserved value, should be 0.

sIndex (SHORT)

Radio-button index.
• No radio button of the group is checked, or this button control does not have the style BS_RADIOBUTTON or BS_AUTORADIOBUTTON. Other
  Zero-based index of the checked radio button of the group.

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