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Windows Media Player 11 SDK Adding Properties to the Sample Audio DSP Plug-in 

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Adding Properties to the Sample Audio DSP Plug-in

The audio DSP sample code that the Windows Media Player Plug-in Wizard generates uses a single property that represents the scale factor for the audio volume. Your plug-in may require more than one property. You can easily add properties to your DSP plug-in in Visual Studio using the following steps:

  1. Define the methods in the interface definition code in the project's IDL file.

  2. Add the method declarations to the main class declaration in the header file: 

    STDMETHOD(get_color)(COLORREF *pColor);
STDMETHOD(put_color)(COLORREF newColor);

  3. Add the method implementations to the project's main CPP file: 

    STDMETHODIMP CYourProject::get_color(COLORREF *pColor)
{
if ( NULL == pColor )
{
return E_POINTER;
}
    

    *pColor = m_Color;
    

    return S_OK;
}

STDMETHODIMP CYourProject::put_color(COLORREF newColor) { m_Color = newColor;

return S_OK;

}

Finally, to make the properties accessible to the user, you'll want to make changes to the property page implementation.

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