MCI_UNFREEZE command
The MCI_UNFREEZE command restores motion to an area of the video buffer frozen with the MCI_FREEZE command. Digital-video, VCR, and video-overlay devices recognize this command.
To send this command, call the mciSendCommand function with the following parameters.
MCIERROR mciSendCommand(
MCIDEVICEID wDeviceID,
MCI_UNFREEZE,
DWORD dwFlags,
(DWORD) (LPMCI_GENERIC_PARMS) lpUnfreeze
);
Parameters
-
wDeviceID
-
Device identifier of the MCI device that is to receive the command message.
-
dwFlags
-
MCI_NOTIFY, MCI_WAIT, or, for digital-video and VCR devices, MCI_TEST. For information about these flags, see The Wait, Notify, and Test Flags.
-
lpUnfreeze
-
Pointer to an MCI_GENERIC_PARMS structure. (Devices with extended command sets might replace this structure with a device-specific structure.)
Return Value
Returns zero if successful or an error otherwise.
Remarks
The following additional flag is used with the digitalvideo device type:
MCI_DGV_RECT
The rc member of the structure identified by lpUnfreeze contains a valid display rectangle. The rectangle specifies a region within the frame buffer whose pixels should have their lock mask bit turned off. Rectangular regions are specified as described for the MCI_PUT command. If omitted, the rectangle defaults to the entire frame buffer. By using a sequence of freeze and unfreeze commands with different rectangles, arbitrary patterns of lock mask bits can be described.
For digital-video devices, the lpUnfreeze parameter points to an MCI_DGV_UNFREEZE_PARMS structure. For more information, see the comments for the MCI_DGV_RECT_PARMS structure.
The following additional flags are used with the vcr device type:
-
MCI_VCR_UNFREEZE_INPUT
-
Unfreeze the input.
-
MCI_VCR_UNFREEZE_OUTPUT
-
Unfreeze the output.
The following additional flag is used with the overlay device type:
-
MCI_OVLY_RECT
-
The rc member of the structure identified by lpUnfreeze contains a valid display rectangle. This is a required parameter.
For video-overlay devices, the lpUnfreeze parameter points to an MCI_OVLY_RECT_PARMS structure.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 2000 Professional [desktop apps only] |
| Minimum supported server |
Windows 2000 Server [desktop apps only] |
| Header |
|