private static Win7ComInterface.IAudioMeterInformation GetAudioMeterInformation()
{
Win7ComInterface.IAudioMeterInformation result = null;
InvokeTryCatch("Win7VolumeOperate.GetAudioMeterInformation", () =>
{
Win7ComInterface.IMMDevice device = Device;
if (device == null)
{
return;
}
const uint CLSCTX_ALL = 23u;
object comMeterInfo;
Guid IID_IAudioMeterInformation = typeof(Win7ComInterface.IAudioMeterInformation).GUID;
Marshal.ThrowExceptionForHR(device.Activate(ref IID_IAudioMeterInformation, CLSCTX_ALL, IntPtr.Zero, out comMeterInfo));
Win7ComInterface.IAudioMeterInformation meterInfo = comMeterInfo as Win7ComInterface.IAudioMeterInformation;
if (meterInfo == null)
{
throw new Exception("初始化 Win7以上操作系统的 音频Com IAudioMeterInformation 组件失败!");
}
int HardwareSupp;
Marshal.ThrowExceptionForHR(meterInfo.QueryHardwareSupport(out HardwareSupp));
result = meterInfo;
});
return(result);
}
private static float GetAudioMeterInfoPeakValue()
{
float result = 0;
InvokeTryCatch("Win7VolumeOperate.GetAudioMeterInfoPeakValue", () =>
{
Win7ComInterface.IAudioMeterInformation audioMeterInfo = AudioMeterInfo;
if (audioMeterInfo == null)
{
return;
}
float temp;
Marshal.ThrowExceptionForHR(audioMeterInfo.GetPeakValue(out temp));
result = temp;
});
return(result);
}
private static int GetAudioMeterInfoCount()
{
int result = 0;
InvokeTryCatch("Win7VolumeOperate.GetAudioMeterInfoCount", () =>
{
Win7ComInterface.IAudioMeterInformation audioMeterInfo = AudioMeterInfo;
if (audioMeterInfo == null)
{
return;
}
int temp;
Marshal.ThrowExceptionForHR(audioMeterInfo.GetMeteringChannelCount(out temp));
result = temp;
});
return(result);
}
private static float[] GetAudioMeterInfoChannelsPeakValues()
{
float[] result = new float[] { 0f, 0f };
InvokeTryCatch("Win7VolumeOperate.GetAudioMeterInfoChannelsPeakValues", () =>
{
Win7ComInterface.IAudioMeterInformation audioMeterInfo = AudioMeterInfo;
if (audioMeterInfo == null)
{
return;
}
int count;
Marshal.ThrowExceptionForHR(audioMeterInfo.GetMeteringChannelCount(out count));
float[] peakValues = new float[count];
GCHandle Params = GCHandle.Alloc(peakValues, GCHandleType.Pinned);
Marshal.ThrowExceptionForHR(audioMeterInfo.GetChannelsPeakValues(peakValues.Length, Params.AddrOfPinnedObject()));
Params.Free();
result = peakValues;
});
return(result);
}