Remarks
Creates a view (in form of memory bitmap referenced by a HBITMAP) of the waveform for the recorded sound: the view can represent the full sound's waveform or portions of it.
Before calling this method it's mandatory performing a previous sound's analysis through a call to the WaveformAnalyzer.AnalyzeFullSound method and waiting its completion through the WaveAnalysisDone event.
For details about generating a waveform bitmap of the recorded sound and about the use of the Waveform Analyzer refer to the How to use the Waveform Analyzer section.
For further details about methods of the Waveform Analyzer refer to the WaveformAnalyzer class section.
Syntax
[Visual Basic]
Public Function SnapshotViewSaveToMemory (
nMode as enumWaveSnapshotViewMode,
nStartPos as Int32,
nEndPos as Int32,
nBitmapWidth as Int32,
nBitmapHeight as Int32,
nChannel as enumWaveformChannels
) as IntPtr
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Parameter
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Description
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nMode
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Snapshot view mode.
Supported values are the following:
Mnemonic value
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Value
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Meaning
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WAVE_SNAPSHOT_MODE_WAVEFORM
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0
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Snapshot of the waveform
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WAVE_SNAPSHOT_MODE_SPECTRAL
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1
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Snapshot of the spectral view
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WAVE_SNAPSHOT_MODE_WAVEFORM_ABS
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2
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Snapshot of the waveform with absolute values
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nStartPos
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Number representing the sound's position, expressed in milliseconds, where the waveform visualization begins.
The value 0 represents the sound's beginning.
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nEndPos
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Number representing the sound's position, expressed in milliseconds, where the waveform visualization ends.
The value -1 represents the sound's end.
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nBitmapWidth
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Number representing the generated bitmap width, expressed in pixels. A value of -1 indicates no width constraints: in this case the control will generate a bitmap large enough in order to contain the full sound's waveform.
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nBitmapHeight
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Number representing the generated bitmap height, expressed in pixels.
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nChannel
|
Audio channel to render.
Supported values are the following:
Mnemonic value
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Value
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Meaning
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WAVEFORM_CHAN_ALL
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-2
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The snapshot contains sound data for all channels separated
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WAVEFORM_CHAN_MIXED
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-1
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The snapshot contains sound data for all channels mixed together
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WAVEFORM_CHAN_0
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0
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The snapshot contains sound data for channel 0 or left channel for stereo
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WAVEFORM_CHAN_1
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1
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The snapshot contains sound data for channel 1 or right channel for stereo
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WAVEFORM_CHAN_2
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2
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The snapshot contains sound data for channel 2
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WAVEFORM_CHAN_3
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3
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The snapshot contains sound data for channel 3
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WAVEFORM_CHAN_4
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4
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The snapshot contains sound data for channel 4
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WAVEFORM_CHAN_5
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5
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The snapshot contains sound data for channel 5
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WAVEFORM_CHAN_6
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6
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The snapshot contains sound data for channel 6
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WAVEFORM_CHAN_7
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7
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The snapshot contains sound data for channel 7
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Return value
Value
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Meaning
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Negative value
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An error occurred (see the LastError property for further error details)
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enumErrorCodes.ERR_NOERROR (0)
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The method call was successful and the returned value represents the handle (HBITMAP) of the waveform's bitmap stored in memory. When the returned HBITMAP is no more needed or before exiting the container application, in order to avoid memory leaks this handle should be deleted using the DeleteObject Windows API.
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