// dispmprt.h

DXGKDDI_DISPLAYMUX_PRE_SWITCH_AWAY_GET_PRIVATE_DATA DxgkddiDisplaymuxPreSwitchAwayGetPrivateData;

NTSTATUS DxgkddiDisplaymuxPreSwitchAwayGetPrivateData(
  PVOID DriverContext,
  ULONG VidPnTargetId,
  ULONG SwitchPrivateDataSize,
  PVOID pSwitchPrivateDataBuffer,
  GUID *pSwitchPrivateDataGUID
)
{...}
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Windows Driver Kit DDI reference (nc-dispmprt-dxgkddi_displaymux_pre_switch_away_get_private_data)

Description

Dxgkrnl calls the DxgkddiDisplayMuxPreSwitchAwayGetPrivateData function of the kernel-mode display driver (KMD) currently connected to the panel to retrieve any private data from it.

Parameters

`DriverContext`

[in] Handle to a context block that is associated with a display adapter. KMD's DxgkDdiAddDevice function previously provided this handle to Dxgkrnl.

`VidPnTargetId`

[in] The VidPN target that the DDI is being called for.

`SwitchPrivateDataSize`

[in] The size, in bytes, of the buffer that pSwitchPrivateDataBuffer points to. The driver provided this value to Dxgkrnl in a previous call to DxgkddiDisplayMuxPreSwitchAway.

`pSwitchPrivateDataBuffer`

[in] Pointer to the allocated buffer in which the driver should copy the switch private data to.

`pSwitchPrivateDataGUID`

[out] Pointer to a variable in which the driver should write the GUID that describes the switch private data. The driver must set a non-zero GUID.

Return value

DxgkddiDisplayMuxPreSwitchAwayGetPrivateData returns STATUS_SUCCESS if it succeeds. Otherwise, it returns an appropriate NT_STATUS error code.

Remarks

This DDI is called under synchronization level 2.

For more information, see Automatic Display Switch.

DXGKDDI_DISPLAYMUX_PRE_SWITCH_AWAY_GET_PRIVATE_DATA - NtDoc