VideoPortUnmapDmaMemory function (video.h)
The VideoPortUnmapDmaMemory function is obsolete in Windows 2000 and later.
VideoPortUnmapDmaMemory unmaps a range of memory previously mapped by VideoPortMapDmaMemory.
Syntax
VIDEOPORT_DEPRECATED VIDEOPORT_API BOOLEAN VideoPortUnmapDmaMemory(
PVOID HwDeviceExtension,
PVOID VirtualAddress,
HANDLE ProcessHandle,
PDMA BoardMemoryHandle
);
Parameters
HwDeviceExtension
Pointer to the miniport driver's device extension.
VirtualAddress
Pointer to a virtual address within the mapped range to be released.
ProcessHandle
Is the handle to the current process.
BoardMemoryHandle
Is the handle to adapter's memory.
Return value
VideoPortUnmapDmaMemory always FALSE.
Remarks
See Bus-Master DMA in Video Miniport Drivers for information about packet-based and common-buffer DMA transfers.
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 |