WM_QUERYCTLTYPE - Parameters
ulReserved
(
ULONG
)
Reserved value, should be 0.
ulReserved
(
ULONG
)
Reserved value, should be 0.
ulType
(
ULONG
)
Control type.
CCT_*
The window is a system control window of specified type.
0
The window is not a system control window.
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