Determining and Changing the Current Position
When a file or device is associated with an MCIWnd window, the playback
position is initially set at the start of the content, regardless of the media type.
During playback, the playback position moves linearly through the content and,
if playback is uninterrupted, eventually reaches the end of the content. If an
interruption occurs, the current playback position is the location at which
playback was stopped or paused.
You can retrieve the locations for the beginning and end of the content by
using the MCIWndGetStart
macros. You can determine the length of the content by subtracting the value
returned by MCIWndGetStart
from the value returned by MCIWndGetEnd
, or by using the MCIWndGetLength
macro. You can retrieve the current playback position by using the MCIWndGetPosition
macro, or you can retrieve the playback position as a null-terminated string
by using the MCIWndGetPositionString
To change the current playback position, use the MCIWndHome
, and MCIWndSeek
macros. You can move the playback position to the start of the content by
or to the end of the content by using MCIWndEnd
. Use MCIWndSeek
to move the playback position to any location in the content.
You can also step through the content by using the MCIWndStep
macro. Beginning from the current playback position, this macro moves the
playback position forward or backward by a specified increment.
The units used to specify position vary among the different media types and
devices. For example, the playback position for AVI files used by the MCIAVI
device is measured in frames; the playback position for CD audio, waveform-audio,
and MIDI files is measured in milliseconds.
Devices for other media types and third-party devices might use other units.
For information about determining these units, see Playback Enhancements
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