public int OnNotify(IntPtr NotifyData)
{
//Since AUDIO_VOLUME_NOTIFICATION_DATA is dynamic in length based on the
//number of audio channels available we cannot just call PtrToStructure
//to get all data, thats why it is split up into two steps, first the static
//data is marshalled into the data structure, then with some IntPtr math the
//remaining floats are read from memory.
//
var data = (AUDIO_VOLUME_NOTIFICATION_DATA) Marshal.PtrToStructure(NotifyData, typeof(AUDIO_VOLUME_NOTIFICATION_DATA));
//Determine offset in structure of the first float
var Offset = Marshal.OffsetOf(typeof (AUDIO_VOLUME_NOTIFICATION_DATA), "ChannelVolume");
//Determine offset in memory of the first float
var FirstFloatPtr = (IntPtr) ((long) NotifyData + (long) Offset);
var voldata = new float[data.nChannels];
//Read all floats from memory.
for (var i = 0; i < data.nChannels; i++)
voldata[i] = (float) Marshal.PtrToStructure(FirstFloatPtr, typeof (float));
//Create combined structure and Fire Event in parent class.
var NotificationData = new AudioVolumeNotificationData(data.bMuted, data.fMasterVolume);
_Parent.FireNotification(NotificationData);
return 0; //S_OK
}
public int OnNotify(IntPtr NotifyData)
{
//Since AUDIO_VOLUME_NOTIFICATION_DATA is dynamic in length based on the
//number of audio channels available we cannot just call PtrToStructure
//to get all data, thats why it is split up into two steps, first the static
//data is marshalled into the data structure, then with some IntPtr math the
//remaining floats are read from memory.
var data = (AUDIO_VOLUME_NOTIFICATION_DATA) Marshal.PtrToStructure(NotifyData, typeof(AUDIO_VOLUME_NOTIFICATION_DATA));
var NotificationData = new AudioVolumeNotificationData(data.bMuted, data.fMasterVolume);
_Parent.FireNotification(NotificationData);
return 0; //S_OK
}
internal void FireNotification(AudioVolumeNotificationData NotificationData)
{
OnVolumeNotification?.Invoke(NotificationData);
}
private void VolNotify(AudioVolumeNotificationData data)
{
if (InvokeRequired)
Invoke(new AudioEndpointVolumeNotificationDelegate(VolNotify),
new object[] {data});
else
{
if (!Moving)
Value = data.MasterVolume;
Mute = data.Muted;
}
}
internal void FireNotification(AudioVolumeNotificationData NotificationData)
{
if (OnVolumeNotification != null)
OnVolumeNotification(NotificationData);
}