BM_QUERYCHECK - Parameters
ulReserved
(
ULONG
)
Reserved value, should be 0.
ulReserved
(
ULONG
)
Reserved value, should be 0.
usCheck
(
USHORT
)
Check indicator.
The button control is in unchecked state. 1
The button control is in checked state.
2
The button control is in indeterminate state.
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