WdfDmaTransactionWdmGetTransferContext - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// wdfdmatransaction.h
PVOID WdfDmaTransactionWdmGetTransferContext(
[in] WDFDMATRANSACTION DmaTransaction
);
View the official Windows Driver Kit DDI referenceNo description available.
[Applies to KMDF only]
The WdfDmaTransactionWdmGetTransferContext method retrieves the WDM transfer context that is associated with a DMA transaction.
DmaTransaction [in]A handle to an initialized DMA transaction object from which to retrieve the transfer context.
A pointer to the DMA transfer context (PTRANSFER_CONTEXT) associated with the transaction.
The DMA transfer context for a transaction is allocated when the driver creates the transaction.
WdfDmaTransactionWdmGetTransferContext must be used with a DMA enabler that uses DMA version 3. To select version 3, set the WdmDmaVersionOverride member of WDF_DMA_ENABLER_CONFIG to 3.
Your driver can use the DMA transfer context to call the following WDM DMA library routines directly:
You must initialize the DMA transaction before calling WdfDmaTransactionWdmGetTransferContext.