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); }