Classes > CoreAudioDevicesMan class > Methods > CoreAudioDevices.PartsChannelsCountGet method

Remarks

Obtains the number of channels for the given subpart of the given audio endpoint device.

This method is only intended for usage with Windows Vista and later versions: further information about management of audio devices in Windows Vista and later versions can be found inside the How to access settings of audio devices in Windows Vista and later versions tutorial.

For further details about methods related to the management of core audio devices refer to the CoreAudioDevicesMan class.

Syntax

[Visual Basic]

Public Function PartsChannelsCountGet (

nDataFlow as enumCoreAudioDataFlows,

nDeviceIndex as Int32,

nPartIndex as Int32,

ByRef nChannelsCount as Int32

) as enumErrorCodes

[C#]

public enumErrorCodes PartsChannelsCountGet (

enumCoreAudioDataFlows nDataFlow,

Int32 nDeviceIndex,

Int32 nPartIndex,

ref Int32 nChannelsCount

);

[C++]

public: enumErrorCodes PartsChannelsCountGet (

enumCoreAudioDataFlows nDataFlow,

Int32 nDeviceIndex,

Int32 nPartIndex,

Int32 __gc *nChannelsCount

);

Parameter

Description

nDataFlow

Direction in which audio data flows between an audio endpoint device and an application.

Supported values are the following:

Mnemonic Value	Value	Meaning
DEVICE_DATA_FLOW_RENDER	0	Audio rendering stream. Audio data flows from the application to the audio endpoint device, which renders the stream
DEVICE_DATA_FLOW_CAPTURE	1	Audio capture stream. Audio data flows from the audio endpoint device that captures the stream, to the application.

nDeviceIndex

Zero-based index of the audio endpoint device. The total number of render or capture audio endpoint devices can be obtained through the CoreAudioDevices.CountGet method passing DEVICE_DATA_FLOW_RENDER or DEVICE_DATA_FLOW_CAPTURE to the nDataFlow parameter.

nPartIndex

Zero-based index of the requested subpart. The total number of available subparts can be obtained through the CoreAudioDevices.PartsCountGet method.

nChannelsCount

Reference that, on return from the method call, will contain the number of channels of the part. The returned value is 0 if the requested part doesn't come with multichannel support..

Return value

Value	Meaning

Negative value	An error occurred, check the LastError property value in order to get the error code
enumErrorCodes.ERR_NOERROR (0)	The method call was successful