VideoPortUnlockPages function (video.h)
The VideoPortUnlockPages function is obsolete in Windows 2000 and later.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 |