Dshow 播放mp3的问题
hr |= m_pGraph->QueryInterface(IID_IMediaControl, (void **)&m_pMediaControl);
hr |= m_pGraph->QueryInterface(IID_IMediaEvent, (void **)&m_pIMediaEvent);
hr |= m_pGraph->QueryInterface(IID_IBasicAudio, (void **)&m_pBasicAudio);
long v1 = 0;
m_pBasicAudio->get_Volume(&v1);
m_pBasicAudio->get_Balance(&v1);
以上代码初始化全部正常,但是在调用m_pBasicAudio相关方法时,无论什么方法,都返回E_notimpl 的错误。m_pBasicAudio初始化是成功的,并且调用m_pMediaControl方法都成功。唯独m_pBasicAudio不行。我的环境是wince6.0 ,希望有经验的高手能解答,谢谢!