Remarks
Creates a graphic file containing the bitmap view of the analysed sound waveform: 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.
For details 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 BitmapViewSaveToFile (
nStartPos as Int32,
nEndPos as Int32,
nBitmapWidth as Int32,
nBitmapHeight as Int32,
nWaveformType as enumWaveformTypes,
strPathname as string,
nFormat as enumGraphicFormats,
nFormatParameter as Int32
) as enumErrorCodes
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Parameter
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Description
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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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nWaveformType
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The type of rendered waveform, related to the sound's channels.
Supported values are the following:
Mnemonic value
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Value
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Meaning
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WAVEFORM_TYPE_LEFT
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0
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The bitmap contains sound data for the left channel
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WAVEFORM_TYPE_RIGHT
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1
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The bitmap contains sound data for the right channel
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WAVEFORM_TYPE_MIXED
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2
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The bitmap contains sound data for left and right mixed channels
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strPathname
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String containing the absolute pathname of the BMP file where the waveform will be saved. If this pathname should contain invalid characters, they would be automatically changed into an underscore '_' character.
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nFormat
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Graphic format used to save the bitmap.
Supported values are the following:
Mnemonic value
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Value
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Meaning
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GRAPHIC_FORMAT_BMP
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0
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BMP format
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GRAPHIC_FORMAT_JPEG
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1
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JPEG format
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GRAPHIC_FORMAT_PNG
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2
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PNG format
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GRAPHIC_FORMAT_GIF
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3
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GIF format
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GRAPHIC_FORMAT_TIFF
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4
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TIFF format
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nFormatParameter
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Eventual parameters required by the chosen graphic format.
When the nFormat parameter is set to GRAPHIC_FORMAT_JPEG, this parameter defines the JPEG compression factor whose range can be in the range from 0 (Maximum compression, Lower Quality) to 100 (Minimum compression, Higher Quality).
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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.NOERROR (0)
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The method call was successful
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