### IMMSequencer

  The IMMSequencer class is the base class for MIDI (Musical Instrument Digital Interface) playback. MIDI is a standard specification for playing back music from a series of commands, rather than from actual audio data. The commands represent musical events, such as turning a note on and off, as well as timing mechanisms for specifying the duration of the note's sound.

### IMMSequencer - Member Functions and Data by Group

### Constructors & Destructor

You can construct and destruct objects of this class.

~IMMSequencer

      public:
      virtual ~IMMSequencer()

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | No

IMMSequencer

  Overload 1

      public:
      IMMSequencer( bool openNow = true,
                    unsigned long instance = 0,
                    bool openShareable = true )

  You can construct an IMMSequencer from the following:

  openNow
    If true, it causes the device to automatically open the device before returning from the constructor; otherwise, you would have to call one of the open functions to open the device yourself.
  instance
    You can provide your own instance number instead of letting IMMSequencer generate one.
  openShareable
    If true, it allows the hardware device to be shared by different programs; otherwise, the hardware cannot be shared.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | No

  Overload 2

      protected:
      IMMSequencer( unsigned long deviceIdentifier,
                    const IString& newAlias = IString ( ) )

  A derived class can construct an IMMSequencer from the following:

  deviceIdentifier
    The value the system uses to identify the device.
  newAlias
    The name you can use to associate a string to the device. Optional.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | No

### Implementation

These members check if the passed-in string is in the correct format to open the current device.

resume

      public:
      virtual IMMSequencer&
        resume( bool resume = true,
                CallType call = wait )

  Resumes playback of the device from a paused state if resume is true.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | No

setVolume

      public:
      virtual IMMSequencer&
        setVolume( unsigned long volume,
                   AudioChannel channel = all,
                   const IMMMillisecondTime& over = IMMMillisecondTime ( ),
                   CallType call = wait )

  Sets the volume of the audio channel for the device, where 0 is the least amount of volume and 100 is the most amount of volume.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | No

Portability Considerations

  This member is overridden in this derived class for specific operating system behavior.

volume

      public:
      virtual unsigned long
        volume( AudioChannel channel = left,
                CallType call = wait ) const

  Returns the volume of the audio channel for the device, where 0 is the least amount of volume and 100 is the most amount of volume.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | No

Portability Considerations

  This member is overridden in this derived class for specific operating system behavior.

isOpenStringValid

      protected:
      virtual bool
        isOpenStringValid( const IString& deviceName ) const

  Returns true if the passed-in open string is valid for this device.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | Yes | No

restoreDeviceSettings

      protected:
      virtual IMMSequencer&
        restoreDeviceSettings( bool newRecordMode = false )

  Restores settings for the current device. Derived classes should override this function, handle class-specific settings, and call the corresponding inherited function.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | No | No

saveDeviceSettings

      protected:
      virtual IMMSequencer& saveDeviceSettings()

  Saves settings for the current device. Derived classes should override this function, handle class-specific settings, and call the corresponding inherited function.

Supported Platforms

  Windows | OS/2 | AIX
  Yes | No | No

### IMMSequencer - Inherited Member Functions and Data

#### Inherited Public Functions

  IMMDevice

  -     virtual ~IMMDevice()

  -     virtual IMMDevice&
          acquire( ShareMode acquire = shareable,
                   bool queuedForResources = false,
                   CallType call = wait )

  -     IString aliasName() const

  -     virtual IMMDevice& close(CallType call = wait)

  -     unsigned long
          connectedDeviceId( ConnectorType type,
                             CallType call = wait ) const

  -     virtual IMMDevice&
          deletePendingEvents( EventType event = allEvents )

  -     IString description(CallType call = wait) const

  -     unsigned long deviceId() const

  -     IString deviceName() const

  -     unsigned long deviceType(CallType call = wait) const

  -     virtual IMMDevice&
          disableAudio( AudioChannel channel = all,
                        const IMMMillisecondTime& over = IMMMillisecondTime ( ),
                        CallType call = wait )

  -     virtual IMMDevice&
          disableConnector( ConnectorType type,
                            CallType call = wait )

  -     virtual IMMDevice&
          enableAudio( bool enable = true,
                       AudioChannel channel = all,
                       const IMMMillisecondTime& over = IMMMillisecondTime ( ),
                       CallType call = wait )

  -     virtual IMMDevice&
          enableConnector( ConnectorType type,
                           bool enable = true,
                           CallType call = wait )

  -     virtual IMMDevice& enableNotification(bool enabled = true)

  -     bool isAcquired(CallType call = wait) const

  -     bool
          isAudioEnabled( AudioChannel channel = all,
                          CallType call = wait )

  -     bool isCloseOnDestroy() const

  -     bool
          isConnectionSupported( ConnectorType type,
                                 CallType call = wait ) const

  -     bool
          isConnectorEnabled( ConnectorType type,
                              CallType call = wait ) const

  -     bool isOpen() const

  -     virtual Mode mode(CallType call = wait) const

  -     virtual IMMDevice&
          open( const IString& fileOrDevice = IString ( ),
                bool shareable = true,
                CallType call = wait )

  -     virtual IMMDevice&
          openOnThread( const IString& fileOrDevice = IString ( ),
                        bool shareable = true,
                        CallType call = wait )

  -     IMMTime prerollTime(CallType call = wait) const

  -     PrerollType prerollType(CallType call = wait) const

  -     virtual IMMDevice& release(CallType call = wait)

  -     bool requiresFiles(CallType call = wait) const

  -     IMMDevice& setCloseOnDestroy(bool close = true)

  -     virtual IMMDevice&
          setSpeedFormat( IMMSpeed::Format format,
                          CallType call = wait )

  -     virtual IMMDevice&
          setTimeFormat( IMMTime::Format format,
                         CallType call = wait )

  -     virtual IMMDevice&
          setVolume( unsigned long volume,
                     AudioChannel channel = all,
                     const IMMMillisecondTime& over = IMMMillisecondTime ( ),
                     CallType call = wait )

  -     IMMSpeed::Format speedFormat(CallType call = wait) const

  -     bool supportsAudio(CallType call = wait) const

  -     bool
          supportsCommand( IMMNotifyEvent::Command command,
                           CallType call = wait ) const

  -     bool supportsDigitalTransfer(CallType call = wait) const

  -     bool supportsDisableEject(CallType call = wait) const

  -     bool supportsEject(CallType call = wait) const

  -     bool supportsPlay(CallType call = wait) const

  -     bool supportsRecord(CallType call = wait) const

  -     bool supportsRecordInsertion(CallType call = wait) const

  -     bool supportsSave(CallType call = wait) const

  -     bool supportsStreaming(CallType call = wait) const

  -     bool supportsVideo(CallType call = wait) const

  -     bool supportsVolumeAdjustment(CallType call = wait) const

  -     IMMTime::Format timeFormat(CallType call = wait) const

  IMMFileMedia

  -     virtual ~IMMFileMedia()

  -     IString filename(CallType call = wait) const

  -     virtual bool isWriteable() const

  -     virtual IMMFileMedia&
          load( const IString& filename,
                bool readOnly = false,
                CallType call = wait )

  -     virtual IMMFileMedia&
          loadOnThread( const IString& filename,
                        bool readOnly = false )

  -     virtual IMMFileMedia&
          open( const IString& fileOrDevice = IString ( ),
                bool shareable = true,
                CallType call = wait )

  -     virtual IMMFileMedia&
          openOnThread( const IString& fileOrDevice = IString ( ),
                        bool shareable = true,
                        CallType call = wait )

  IMMPlayableDevice

  -     virtual ~IMMPlayableDevice()

  -     virtual IMMPlayableDevice&
          addCuePoint( const IMMTime& time,
                       CallType call = wait )

  -     virtual IMMPlayableDevice&
          cueForPlayback( CallType call = wait )

  -     unsigned long length(CallType call = wait) const

  -     virtual IMMPlayableDevice& pause(CallType call = wait)

  -     virtual IMMPlayableDevice&
          play( const IMMTime& from = IMMTime ( ),
                const IMMTime& to = IMMTime ( ),
                bool resumeIfPaused = true,
                CallType call = nowait )

  -     unsigned long position(CallType call = wait) const

  -     virtual IMMPlayableDevice&
          removeCuePoint( const IMMTime& time,
                          CallType call = wait )

  -     virtual IMMPlayableDevice&
          resume( bool resume = true,
                  CallType call = wait )

  -     virtual IMMPlayableDevice&
          seek( const IMMTime& to,
                CallType call = wait )

  -     virtual IMMPlayableDevice& seekToEnd(CallType call = wait)

  -     virtual IMMPlayableDevice&
          seekToStart( CallType call = wait )

  -     virtual IMMPlayableDevice&
          startPositionTracking( const IMMTime& timeInterval,
                                 CallType call = wait )

  -     virtual IMMPlayableDevice&
          stepFrame( unsigned long frames = 1,
                     bool forward = true,
                     CallType call = wait )

  -     virtual IMMPlayableDevice& stop(CallType call = wait)

  -     virtual IMMPlayableDevice&
          stopPositionTracking( CallType call = wait )

  INotifier

  -     virtual ~INotifier()

  -     virtual INotifier& disableNotification() = 0

  -     virtual INotifier&
          enableNotification( bool enable = true ) = 0

  -     INotifier()

  -     virtual bool isEnabledForNotification() const = 0

  -     virtual INotifier&
          notifyObservers( const INotificationEvent& event ) = 0

  -     virtual INotifier&
          notifyObserversAsync( const INotificationEvent& event )

  -     const IThreadId& threadId() const

  IStandardNotifier

  -     virtual ~IStandardNotifier()

  -     virtual IStandardNotifier& disableNotification()

  -     virtual IStandardNotifier&
          enableNotification( bool enable = true )

  -     virtual bool isEnabledForNotification() const

  -     IStandardNotifier(const IStandardNotifier& copy)

  -     IStandardNotifier()

  -     virtual INotifierAddress notifierAddress() const

  -     virtual IStandardNotifier&
          notifyObservers( const INotificationEvent& anEvent )

  -     virtual IStandardNotifier&
          notifyObserversAsync( const INotificationEvent& anEvent )

  -     IStandardNotifier&
          operator =( const IStandardNotifier& aStandardNotifier )

#### Inherited Public Data

  INotifier

  -     static INotificationId const allChangesId

  -     static INotificationId const deleteId

  IMMDevice

  -     static const unsigned long allDevices

  -     static const unsigned long ampMixer

  -     static const unsigned long animation

  -     static const unsigned long audioCD

  -     static const unsigned long audioTape

  -     static const unsigned long cdxa

  -     static INotificationId const commandNotifyId

  -     static INotificationId const cuePointId

  -     static const unsigned long dat

  -     static INotificationId const deviceEventId

  -     static const unsigned long digitalVideo

  -     static const unsigned long headphone

  -     static const unsigned long microphone

  -     static const unsigned long monitor

  -     static const unsigned long other

  -     static const unsigned long overlay

  -     static INotificationId const passDeviceId

  -     static INotificationId const positionChangeId

  -     static const unsigned long sequencer

  -     static const unsigned long speaker

  -     static const unsigned long videoDisc

  -     static const unsigned long videoTape

  -     static const unsigned long waveAudio

#### Inherited Protected Functions

  INotifier

  -     virtual INotifier&
          addObserver( IObserver& observer,
                       const IInterest& interest )

  -     virtual INotifier&
          notifyObservers( const INotificationId& id ) = 0

  -     virtual IObserverList&
          observerList( const IInterest* anInterest = 0 ) const = 0

  -     virtual INotifier& removeAllObservers() = 0

  -     virtual INotifier& removeObserver(IObserver& observer) = 0

  -     virtual INotifier&
          removeObserver( IObserver& observer,
                          const IInterest& interest )

  IStandardNotifier

  -     virtual IStandardNotifier&
          addObserver( IObserver& observer,
                       const IInterest& interest )

  -     virtual IStandardNotifier&
          notifyObservers( const INotificationId& nId )

  -     virtual IObserverList&
          observerList( const IInterest* anInterest = 0 ) const

  -     virtual IStandardNotifier& removeAllObservers()

  -     virtual IStandardNotifier&
          removeObserver( IObserver& observer,
                          const IInterest& interest )

  -     virtual IStandardNotifier&
          removeObserver( IObserver& observer )

  IMMDevice

  -     IMMMessageWindow& deviceWindow() const

  -     IMMDevice( unsigned long deviceIdentifier,
                   const IString& newAlias = IString ( ) )

  -     IMMDevice(const IString& fileOrDevice)

  -     unsigned long
          itemCapability( unsigned long item,
                          CallType call ) const

  -     unsigned long
          itemStatus( unsigned long item,
                      unsigned long value = 0,
                      CallType call = wait ) const

  -     unsigned long lastError() const

  -     virtual bool
          mixerControlValues( unsigned long dwComponentType,
                              unsigned long dwControlType,
                              unsigned long* ulDetails,
                              bool uniform = true,
                              unsigned long multipleItems = 0,
                              unsigned long hmx = NULL )

  -     virtual bool
          mixerControlValues( unsigned long dwComponentType,
                              unsigned long dwControlType,
                              unsigned short* usDetails,
                              bool uniform = true,
                              unsigned long multipleItems = 0,
                              unsigned long hmx = NULL )

  -     IMMDeviceNotifyHandler* notificationHandler() const

  -     virtual IMMDevice&
          open( unsigned long instanceNumber,
                bool shareable = true,
                CallType call = nowait )

  -     virtual IMMDevice&
          openOnThread( unsigned long instanceNumber,
                        bool shareable = true )

  -     OpenStatus openStatus() const

  -     virtual IMMDevice&
          restoreDeviceSettings( bool newRecordMode = false )

  -     virtual IMMDevice& saveDeviceSettings()

  -     IString
          sendCommand( const IString& command,
                       unsigned short userParm )

  -     IString sendCommand(const IString& command)

  -     IMMDevice&
          sendCommand( unsigned short message,
                       unsigned long param1,
                       void* param2,
                       unsigned short userParm )

  -     IMMDevice&
          sendCommand( unsigned short message,
                       unsigned long param1,
                       void* param2 )

  -     IMMDevice& setLastError(unsigned long errorId)

  -     virtual bool
          setMixerControlValues( unsigned long dwComponentType,
                                 unsigned long dwControlType,
                                 unsigned long* ulDetails,
                                 bool uniform = true,
                                 unsigned long multipleItems = 0,
                                 unsigned long hmx = NULL )

  -     virtual bool
          setMixerControlValues( unsigned long dwComponentType,
                                 unsigned long dwControlType,
                                 unsigned short* usDetails,
                                 bool uniform = true,
                                 unsigned long multipleItems = 0,
                                 unsigned long hmx = NULL )

  -     IMMDevice&
          setNotificationHandler( IMMDeviceNotifyHandler* notifyHandler )

  -     IMMDevice& setOpenStatus(OpenStatus status)

  -     IMMDevice& setPassDeviceRequested(bool sawPassDevice)

  -     IMMDevice& setSystemMixerHandle(unsigned long hmx)

  -     IMMDevice& setUserParameter(unsigned short userParm = 0)

  -     unsigned long systemMixerHandle() const

  -     unsigned short userParameter() const

  -     bool wasPassDeviceRequested() const

  IMMFileMedia

  -     virtual IMMFileMedia& enableDataUpdate(bool update = true)

  -     IMMFileMedia( const IString& deviceName,
                      bool openNow,
                      unsigned long instance,
                      bool openShareable )

  -     IMMFileMedia( unsigned long deviceIdentifier,
                      const IString& newAlias = IString ( ) )

  -     virtual IMMFileMedia&
          open( unsigned long instanceNumber,
                bool shareable = true,
                CallType call = nowait )

  -     virtual IMMFileMedia&
          openOnThread( unsigned long instanceNumber,
                        bool shareable = true )

  -     virtual IMMFileMedia&
          restoreDeviceSettings( bool newRecordMode = false )

  -     virtual IMMFileMedia& saveDeviceSettings()

  IMMPlayableDevice

  -     IMMPlayableDevice( const IString& deviceOrFileName,
                           bool openNow = true,
                           unsigned long instance = 0,
                           bool openShareable = true )

  -     IMMPlayableDevice( unsigned long deviceIdentifier,
                           const IString& newAlias = IString ( ) )

  -     virtual IMMPlayableDevice&
          restoreDeviceSettings( bool newRecordMode = false )

  -     virtual IMMPlayableDevice& saveDeviceSettings()

#### Inherited Protected Data

  - None