// acxelements.h

typedef struct _ACX_PEAKMETER_CALLBACKS {
  ULONG                            Size;
  PFN_ACX_PEAKMETER_RETRIEVE_LEVEL EvtAcxPeakMeterRetrieveLevel;
  PFN_ACX_OBJECT_PROCESS_REQUEST   EvtAcxPeakMeterProcessRequest;
} ACX_PEAKMETER_CALLBACKS, *PACX_PEAKMETER_CALLBACKS;
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Windows Driver Kit DDI reference (ns-acxelements-acx_peakmeter_callbacks)

Description

The ACX_PEAKMETER_CALLBACKS structure identifies the driver callbacks for ACX peakmeter operations.

Members

`Size`

The length, in bytes, of this structure.

`EvtAcxPeakMeterRetrieveLevel`

The EVT_ACX_PEAKMETER_RETRIEVE_LEVEL callback.

`EvtAcxPeakMeterProcessRequest`

The EVT_ACX_OBJECT_PROCESS_REQUEST callback.

Remarks

Example

Example usage is shown below.

    ACX_PEAKMETER_CALLBACKS         peakmeterCallbacks;
    ACX_PEAKMETER_CONFIG            peakmeterCfg;
    ACXPEAKMETER                    peakmeterElement;

...
        ACX_PEAKMETER_CALLBACKS peakmeterCallbacks;
        ACX_PEAKMETER_CALLBACKS_INIT(&peakmeterCallbacks);
        peakmeterCallbacks.EvtAcxPeakMeterRetrieveLevel = CodecR_EvtPeakMeterRetrieveLevelCallback;

        ACX_PEAKMETER_CONFIG peakmeterCfg;
        ACX_PEAKMETER_CONFIG_INIT(&peakmeterCfg);
        peakmeterCfg.ChannelsCount = MAX_CHANNELS;
        peakmeterCfg.Minimum = PEAKMETER_MINIMUM;
        peakmeterCfg.Maximum = PEAKMETER_MAXIMUM;
        peakmeterCfg.SteppingDelta = PEAKMETER_STEPPING_DELTA;
        peakmeterCfg.Callbacks = &peakmeterCallbacks;

ACX requirements

Minimum ACX version: 1.0

For more information about ACX versions, see ACX version overview.

ACX_PEAKMETER_CALLBACKS - NtDoc