GBM_QUERYSTATE - Parameters
ulReserved
(
ULONG
)
Reserved.
ulReserved
(
ULONG
)
Reserved.
rc
(
ULONG
)
Return codes indicating the state of the graphic button.
GB_UP
The graphic button is in the Up state.
GB_DOWN
The graphic button is in the Down state.
GB_HILITE
The graphic button is in the highlighted state.
GB_ERROR
An error has occurred.
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