// 音量更改回调函数 void CALLBACK Widget::VolumeChange_CallBack(BRAC_AudioDevice device, DWORD dwCurrentVolume, LPVOID lpUserValue) { Widget *pDemoDlg = (Widget*)lpUserValue; if(pDemoDlg) { if(device == BRAC_AD_WAVEIN) pDemoDlg->OnWaveInVolumeChange(dwCurrentVolume); else pDemoDlg->OnWaveOutVolumeChange(dwCurrentVolume); } }