unfreeze
The unfreeze
command reenables video acquisition to the frame buffer after it has been
disabled by the freeze
command. Digital-video, VCR, and video-overlay devices recognize this command.
wsprintf(lpstrCommand, "unfreeze %s %s
%s", lpszDeviceID, lpszUnfreeze,
lpszFlags);
Parameters
lpszDeviceID
Identifier of
an MCI device. This identifier or alias is assigned when the device is opened.
lpszUnfreeze
Flag for
reenabling video acquisition to the frame buffer. The following table lists
device types that recognize the unfreeze command and the flags used by
each type:
|
digitalvideo |
at
rectangle |
|
overlay |
at rectangle |
|
vcr |
input
output |
The following
table lists the flags that can be specified in the lpszUnfreeze parameter
and their meanings:
|
at rectangle
|
Specifies
the region that will have video acquisition reenabled. The rectangle is
relative to the video buffer origin and is specified as X1 Y1 X2 Y2.
The coordinates X1 Y1 specify the upper left corner of the rectangle,
and the coordinates X2 Y2 specify the width and height. |
|
input |
Unfreeze
the input image. |
|
output |
Unfreeze
the output image. If neither input nor output is given, output is
assumed. |
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.
Remarks
The following
command unfreezes a region of the video buffer:
unfreeze vboard at 10 20 90 165
See Also