mixerGetLineInfo (Windows Embedded CE 6.0)

1/6/2010

This function retrieves information about a specific line of a mixer device.

Syntax

MMRESULT mixerGetLineInfo(
  HMIXEROBJ hmxobj, 
  LPMIXERLINE pmxl, 
  DWORD fdwInfo 
);

Parameters

• hmxobj
  Handle to the mixer device object that controls the specific audio line.

• pmxl
  Pointer to a MIXERLINE structure.

  This structure is filled with information about the audio line for the mixer device.

  The cbStruct member must always be initialized to be the size, in bytes, of the MIXERLINE structure.

• fdwInfo
  Flags for retrieving information about an audio line.

  The following table shows the possible flags.

  Flag	Description
  MIXER_GETLINEINFOF_COMPONENTTYPE	The pmxl parameter will receive information about the first audio line of the type specified in the dwComponentType member of the MIXERLINE structure. This flag is used to retrieve information about an audio line of a specific component type. Remaining structure members except cbStruct require no further initialization.
  MIXER_GETLINEINFOF_DESTINATION	The pmxl parameter will receive information about the destination audio line specified by the dwDestination member of the MIXERLINE structure. This index ranges from zero to one less than the value in the cDestinations member of the MIXERCAPS structure. All remaining structure members except cbStruct require no further initialization.
  MIXER_GETLINEINFOF_LINEID	The pmxl parameter will receive information about the audio line specified by the dwLineID member of the MIXERLINE structure. This is usually used to retrieve updated information about the state of an audio line. All remaining structure members except cbStruct require no further initialization.
  MIXER_GETLINEINFOF_SOURCE	The pmxl parameter will receive information about the source audio line specified by the dwDestination and dwSource members of the MIXERLINE structure. The index specified by dwDestination ranges from zero to one less than the value in the cDestinations member of the MIXERCAPS structure. The index specified by dwSource ranges from zero to one less than the value in the cConnections member of the MIXERLINE structure returned for the audio line stored in the dwDestination member. All remaining structure members except cbStruct require no further initialization.
  MIXER_GETLINEINFOF_TARGETTYPE	The pmxl parameter will receive information about the audio line for the Target.dwType member of MIXERLINE. This flag is used to retrieve information about an audio line that handles the target type (for example, MIXERLINE_TARGETTYPE_WAVEOUT). An application must initialize the Target.dwType, Target.wMid, Target.wPid, Target.vDriverVersion and Target.szPname members of the MIXERLINE structure before calling mixerGetLineInfo. All of these values can be retrieved from the device capabilities structures for all media devices. Remaining structure members except cbStruct require no further initialization.
  MIXER_OBJECTF_HMIXER	The hmxobj parameter is a mixer device handle returned by the mixerOpen function. This flag is optional.
  MIXER_OBJECTF_MIXER	The hmxobj parameter is a mixer device identifier in the range of zero to one less than the number of devices returned by the mixerGetNumDevs function. This flag is optional.

  The following flags are supported in other versions of Windows, but not in Windows Embedded CE.

  Flags not supported in Windows Embedded CE
  MIXER_OBJECTF_AUX
  MIXER_OBJECTF_HMIDIN
  MIXER_OBJECTF_HMIDIOUT
  MIXER_OBJECTF_HWAVEIN
  MIXER_OBJECTF_HWAVEOUT
  MIXER_OBJECTF_MIDIIN
  MIXER_OBJECTF_MIDIOUT
  MIXER_OBJECTF_WAVEHOUT
  MIXER_OBJECTF_WAVEIN

Return Value

Returns MMSYSERR_NOERROR if successful or an error otherwise.

The following table shows the possible values.

Requirements

See Also

Reference

Hardware Audio Mixer Functions
MIXERLINE
MIXERCAPS
mixerOpen
mixerGetNumDevs