step
The step
command steps the play one or more frames forward or reverse. The default
action is to step forward one frame. Digital-video, VCR, and CAV-format
videodisc devices recognize this command.
wsprintf(lpstrCommand, "step %s %s %s",
lpszDeviceID, lpszStepFlags,
lpszFlags);
Parameters
lpszDeviceID
Identifier of
an MCI device. This identifier or alias is assigned when the device is opened.
lpszStepFlags
One or both of
the following flags:
|
by frames |
Indicates
the number of frames to step. If you specify a negative frames value,
you cannot specify the reverse flag. |
|
reverse |
Step the
frames in reverse. |
lpszFlags
Can be
wait , notify , or both. For digital-video and VCR devices, test can also
be specified. For more information about these flags, see The Wait, Notify,
and Test Flags.
Return Values
Returns zero
if successful or an error otherwise.