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MCI_SIGNAL
The MCI_SIGNAL command sets a specified position in the workspace. Digital-video devices
recognize this command. MCIAVI supports only one active signal at a time.
MCIERROR mciSendCommand(MCIDEVICEID wDeviceID, MCI_SIGNAL,
DWORD dwFlags, (DWORD) (LPMCI_DGV_SIGNAL_PARMS) lpSignal);
Parameters
wDeviceID
Device identifier of the MCI device that is to receive the command message.
dwFlags
MCI_NOTIFY, MCI_WAIT, or MCI_TEST. For information about these flags, see The Wait, Notify, and Test Flags.
lpSignal
Address of an MCI_DGV_SIGNAL_PARMS structure.
Return Values
Returns zero if successful or an error otherwise.
Remarks
The window whose handle you specify in the dwCallback member of the MCI_DGV_SIGNAL_PARMS structure receives the MM_MCISIGNAL message.
The following flags apply to digital-video devices:
MCI_DGV_SIGNAL_AT
A signal position is included in the dwPosition member of the structure identified by lpSignal.
MCI_DGV_SIGNAL_CANCEL
Removes the signal position specified by the value associated with
MCI_DGV_SIGNAL_USERVAL.
MCI_DGV_SIGNAL_EVERY
A signal-period value is included in the dwPeriod member of the structure identified by lpSignal.
MCI_DGV_SIGNAL_POSITION
The device will send the position value with the Windows message instead of
the user-specified value.
MCI_DGV_SIGNAL_USERVAL
A data value is included in the dwUserParm member of the structure identified by lpSignal. The data value associated with this request is reported back with the
Windows message.
See Also
MCI_DGV_SIGNAL_PARMS
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