Remarks
Sets a background picture from a graphic file.
For further details about methods of the Waveform scroller refer to the WaveformScroller object.
For a tutorial about the use of Waveform scrollers refer to the How to scroll the sound's waveform during playback tutorial.
Syntax
[Visual Basic]
control.WaveformScroller.SetBackPictureFromFile (
hWndWaveformScroller as OLE_HANDLE,
strPathname as String,
nMode as enumBitmapModes
) as enumWanErrorCodes
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[C++]
short control.WaveformScroller.SetBackPictureFromFile (
OLE_HANDLE hWndWaveformScroller,
LPCTSTR strPathname,
short nMode
);
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Parameter
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Description
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hWndWaveformScroller
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Handle of the control returned by a previous call to the WaveformScroller.Create method
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strPathname
|
Absolute pathname of the picture file to load. Accepted graphic formats are BMP, JPEG, GIF, TIFF and PNG.
An empty pathname will reset an eventual picture set through a previous call to this method.
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nMode
|
Bitmap mode.
Supported values are the following:
Mnemonic constant
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Value
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Meaning
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BITMAP_MODE_TOP_LEFT
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0
|
Bitmap will be drawn in top-left position on the destination rectangle
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BITMAP_MODE_CENTER
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1
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Bitmap will be drawn in centered position on the destination rectangle
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BITMAP_MODE_STRETCH
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2
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Bitmap will be stretched in order to fit the destination rectangle
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BITMAP_MODE_TILE
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3
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Bitmap will be tiled in order to fill the destination rectangle
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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, check the LastError property value in order to get the error code
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enumWanErrorCodes.ERR_WAN_NOERROR (0)
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The method call was successful
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