private static Win7ComInterface.IAudioEndpointVolume GetAudioEndPointVolume()
{
Win7ComInterface.IAudioEndpointVolume result = null;
InvokeTryCatch("Win7VolumeOperate.GetAudioEndPointVolume", () =>
{
Win7ComInterface.IMMDevice device = Device;
if (device == null)
{
return;
}
const uint CLSCTX_ALL = 23u;
object comEndPointVol;
Guid IID_IAudioEndpointVolume = typeof(Win7ComInterface.IAudioEndpointVolume).GUID;
Marshal.ThrowExceptionForHR(device.Activate(ref IID_IAudioEndpointVolume, CLSCTX_ALL, IntPtr.Zero, out comEndPointVol));
Win7ComInterface.IAudioEndpointVolume endPointVol = comEndPointVol as Win7ComInterface.IAudioEndpointVolume;
if (endPointVol == null)
{
throw new Exception("初始化 Win7以上操作系统的 音频Com IAudioEndpointVolume 组件失败!");
}
uint HardwareSupp;
Marshal.ThrowExceptionForHR(endPointVol.QueryHardwareSupport(out HardwareSupp));
result = endPointVol;
});
return(result);
}
private static void SetEndPointVolumeMasterVolumeLevelScalar(float value)
{
InvokeTryCatch("Win7VolumeOperate.SetEndPointVolumeMasterVolumeLevelScalar", () =>
{
Win7ComInterface.IAudioEndpointVolume endPointVolume = EndPointVolume;
if (endPointVolume == null)
{
return;
}
Marshal.ThrowExceptionForHR(endPointVolume.SetMasterVolumeLevelScalar(value, Guid.Empty));
});
}
private static float GetEndPointVolumeMasterVolumeLevelScalar()
{
float result = 0;
InvokeTryCatch("Win7VolumeOperate.GetEndPointVolumeMasterVolumeLevelScalar", () =>
{
Win7ComInterface.IAudioEndpointVolume endPointVolume = EndPointVolume;
if (endPointVolume == null)
{
return;
}
float temp;
Marshal.ThrowExceptionForHR(endPointVolume.GetMasterVolumeLevelScalar(out temp));
result = temp;
});
return(result);
}
private static bool GetEndPointVolumeMute()
{
bool result = false;
InvokeTryCatch("Win7VolumeOperate.GetEndPointVolumeMute", () =>
{
Win7ComInterface.IAudioEndpointVolume endPointVolume = EndPointVolume;
if (endPointVolume == null)
{
return;
}
bool temp;
Marshal.ThrowExceptionForHR(endPointVolume.GetMute(out temp));
result = temp;
});
return(result);
}
