public void 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 = MarshalHelpers.PtrToStructure <AudioVolumeNotificationDataStruct>(notifyData);
//Determine offset in structure of the first float
var offset = MarshalHelpers.OffsetOf <AudioVolumeNotificationDataStruct>("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 (int i = 0; i < data.nChannels; i++)
{
voldata[i] = MarshalHelpers.PtrToStructure <float>(firstFloatPtr);
}
//Create combined structure and Fire Event in parent class.
var notificationData = new AudioVolumeNotificationData(data.guidEventContext, data.bMuted, data.fMasterVolume, voldata, data.guidEventContext);
parent.FireNotification(notificationData);
}
public void OnNotify(IntPtr notifyData)
{
AudioVolumeNotificationDataStruct audioVolumeNotificationDataStruct = MarshalHelpers.PtrToStructure <AudioVolumeNotificationDataStruct>(notifyData);
IntPtr value = MarshalHelpers.OffsetOf <AudioVolumeNotificationDataStruct>("ChannelVolume");
IntPtr pointer = (IntPtr)((long)notifyData + (long)value);
float[] array = new float[audioVolumeNotificationDataStruct.nChannels];
int num = 0;
while ((long)num < (long)((ulong)audioVolumeNotificationDataStruct.nChannels))
{
array[num] = MarshalHelpers.PtrToStructure <float>(pointer);
num++;
}
AudioVolumeNotificationData notificationData = new AudioVolumeNotificationData(audioVolumeNotificationDataStruct.guidEventContext, audioVolumeNotificationDataStruct.bMuted, audioVolumeNotificationDataStruct.fMasterVolume, array, audioVolumeNotificationDataStruct.guidEventContext);
this.parent.FireNotification(notificationData);
}