signal - Win32 Multimedia Programmer's Reference

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signal

The signal command identifies a specified position in the workspace by sending the application an MM_MCISIGNAL message. Digital-video devices recognize this command. MCIAVI supports only one active signal at a time.

wsprintf(lpstrCommand, "signal %s %s %s", lpszDeviceID, lpszSignalFlags,
lpszFlags);

Parameters
lpszDeviceID
Identifier of an MCI device. This identifier or alias is assigned when the device is opened.

lpszSignalFlags
One of the following flags:

at position	Specifies the frame to invoke a signal.
cancel	Removes signals from the workspace. An individual signal is specified by using the "uservalue" flag. If the "uservalue" flag is not specified by using "cancel", the device cancels all signals. The "cancel" flag is incompatible with the "at", "every", and "return position" flags.
every interval	Specifies the period of the signals. The interval value is specified in the current time format. If used with "at" position, signals are placed throughout the workspace with one signal mark placed at position. Without the "at" flag, signals are placed throughout the workspace with one signal at the current position. If this flag is omitted, only the position indicated by the "at" flag is marked. If the interval value is less than the minimum frequency supported by a device, it will use its minimum value.
return position	Indicates the device should send the position value instead of the "uservalue" identifier in the signaling message. The "uservalue" identifier can still be used to cancel or to redefine the signal marks.
uservalue id	Specifies an identifier that is reported back with the signaling message. This identifier acts as an identifier that can be used with other signal commands to reference this signal setting. If omitted, the default value is zero.

lpszFlags

Can be "wait", "notify", "test", or a combination of these. For more information about these flags, see The Wait, Notify, and Test Flags.

Return Values
Returns zero if successful or an error otherwise.

Remarks
The window handle used for notification of command completion messages is also used for signaling.

See Also
MM_MCISIGNAL

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