IDmaChannel::CopyFrom method (portcls.h)
The CopyFrom method copies sample data from the DMA channel's common buffer to the specified destination buffer.
Syntax
void CopyFrom(
PVOID Destination,
PVOID Source,
ULONG ByteCount
);
Parameters
Destination
Pointer to the destination buffer
Source
Pointer to the source buffer, which is located in the DMA channel's common buffer.
ByteCount
Specifies the number of bytes to be copied.
Return value
None
Remarks
The Source and Destination pointers are both kernel-mode virtual addresses. The IDmaChannel::SystemAddress call returns the virtual address of a DMA channel's common buffer.
The Source parameter points to the beginning of the source buffer, which occupies ByteCount contiguous bytes in the DMA channel's common buffer.
Requirements
| Requirement | Value |
|---|---|
| Header | portcls.h |
| IRQL | Any level |