Copyright © 2005-2018 MultiMedia Soft

Waveform.BitmapViewSaveToMemory method

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Remarks

 

Creates a view (in form of memory bitmap referenced by a HBITMAP) of the waveform for the sound loaded inside the given player: 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 Waveform.AnalyzeFullSound method.

 

For further details about generating a waveform bitmap of the loaded sound, before starting its playback, refer to the How to obtain the sound's waveform tutorial.

 

 

Syntax

 

[Visual Basic]

Public Function BitmapViewSaveToMemory (

nPlayerIndex as Int16,

nStartPos as Int32,

nEndPos as Int32,

nBitmapWidth as Int32,

nBitmapHeight as Int32,

nWaveformType as enumWaveformTypes

) as IntPtr


 

[C#]

public IntPtr BitmapViewSaveToMemory (

Int16 nPlayerIndex,

Int32 nStartPos,

Int32 nEndPos,

Int32 nBitmapWidth,

Int32 nBitmapHeight,

enumWaveformTypes nWaveformType

);


 

[C++]

public: IntPtr BitmapViewSaveToMemory (

Int16 nPlayerIndex,

Int32 nStartPos,

Int32 nEndPos,

Int32 nBitmapWidth,

Int32 nBitmapHeight,

enumWaveformTypes nWaveformType

);


 

 

Parameter

Description

 

 

nPlayerIndex

Number representing the zero-based index of the player that will use the Waveform

nStartPos

Number representing the sound's position, expressed in milliseconds, where the waveform visualization begins.

The value 0 represents the sound's beginning.

nEndPos

Number representing the sound's position, expressed in milliseconds, where the waveform visualization ends.

The value -1 represents the sound's end.

nBitmapWidth

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.

nBitmapHeight

Number representing the generated bitmap height, expressed in pixels.

nWaveformType

The type of rendered waveform, related to the sound's channels.

Supported values are the following:

Mnemonic value

Value

Meaning

WAVEFORM_TYPE_LEFT

0

The bitmap contains sound data for the left channel

WAVEFORM_TYPE_RIGHT

1

The bitmap contains sound data for the right channel

WAVEFORM_TYPE_MIXED

2

The bitmap contains sound data for left and right mixed channels

 

 

Return value

 

Value

Meaning

 

 

0

An error occurred (check the LastError property for error details)

Value is not 0

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.