WM_COMMAND - Parameters
usCommand
(
USHORT
)
The command value. The application must relate the command to an application function.
usSource
(
USHORT
)
Identifies the type of control that generated this command as CMDSRC_PUSHBUTTON.
usPointer
(
USHORT
)
The pointer-device indicator.
rc
(
ULONG
)
Reserved.
[Back: WM_COMMAND Return Value - rc]
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