Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
The VideoPortUnlockPages function is obsolete in Windows 2000 and later. Use VideoPortUnlockBuffer in place of this function.
VideoPortUnlockPages releases memory used for packet-based DMA.
Syntax
VIDEOPORT_DEPRECATED VIDEOPORT_API BOOLEAN VideoPortUnlockPages(
PVOID hwDeviceExtension,
PDMA pDma
);
Parameters
hwDeviceExtension
Pointer to the miniport driver's device extension.
pDma
Specifies a non-NULL DMA handle.
Return value
VideoPortUnlockPages always returns TRUE.
Remarks
See Bus-Master DMA in Video Miniport Drivers for information about packet-based and common-buffer DMA transfers.
This function can be called only within the context of a DMA IOCTL. It cannot be called from an ISR or DPC.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows 2000 and later versions of the Windows operating systems. |
| Target Platform | Desktop |
| Header | video.h (include Video.h) |
| Library | Videoprt.lib |
| DLL | Videoprt.sys |