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
 

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.

See Also

MCI Overview, MCI Command Strings, freeze