No active devices BugFix

AudioSwitch.csproj

@@ -122,6 +122,7 @@
     <Compile Include="CoreAudioApi\AudioVolumeNotificationData.cs">
       <SubType>Code</SubType>
     </Compile>
+    <Compile Include="CoreAudioApi\DeviceNotFoundException.cs" />
     <Compile Include="CoreAudioApi\EDeviceState.cs" />
     <Compile Include="CoreAudioApi\EDataFlow.cs">
       <SubType>Code</SubType>

Classes/Program.cs

@@ -44,7 +44,10 @@ private static void Main(string[] args)
 
             try
             {
+#if !DEBUG
+                //log and handle error only if not debugging
                 AppDomain.CurrentDomain.UnhandledException += CurrentDomainUnhandledException;
+#endif
                 settings = Settings.Load();
 
                 if (args.Length > 0)
@@ -225,7 +228,7 @@ private static void Main(string[] args)
                 }
             }
         }
-
+#if !DEBUG
         static void CurrentDomainUnhandledException(object sender, UnhandledExceptionEventArgs e)
         {
             try
@@ -250,6 +253,7 @@ static void CurrentDomainUnhandledException(object sender, UnhandledExceptionEve
                 Application.Exit();
             }
         }
+#endif
     }
 }
 

Controls/VolumeBar.cs

@@ -225,7 +225,14 @@ private void VolNotify(AudioVolumeNotificationData data)
 
         internal void RegisterDevice(EDataFlow RenderType)
         {
-            Device = EndPoints.DeviceEnumerator.GetDefaultAudioEndpoint(RenderType, ERole.eMultimedia);
+            try
+            {
+                Device = EndPoints.DeviceEnumerator.GetDefaultAudioEndpoint(RenderType, ERole.eMultimedia);
+            }
+            catch (DeviceNotFoundException)
+            {//According to previous code state further code won't be called if no devices
+                return;
+            }
             Value = Device.AudioEndpointVolume.MasterVolumeLevelScalar;
             Mute = Device.AudioEndpointVolume.Mute;
             Stereo = Device.AudioMeterInformation.Channels.GetCount() > 1;

CoreAudioApi/DeviceNotFoundException.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace AudioSwitch.CoreAudioApi
+{
+    //Inheriting COMException for backward compatibility (the same for HResult in ctor)
+    public class DeviceNotFoundException : COMException
+    {
+        // ReSharper disable once InconsistentNaming
+        internal const int E_NOTFOUND = -2147023728;
+
+        internal DeviceNotFoundException(string message, Exception inner) : base(message, inner)
+        {
+            HResult = E_NOTFOUND;//https://msdn.microsoft.com/en-us/library/windows/desktop/dd371401(v=vs.85).aspx
+        }
+    }
+}

CoreAudioApi/MMDeviceEnumerator.cs

@@ -43,11 +43,27 @@ public MMDeviceCollection EnumerateAudioEndPoints(EDataFlow dataFlow, EDeviceSta
             return new MMDeviceCollection(result);
         }
 
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="dataFlow"></param>
+        /// <param name="role"></param>
+        /// <returns></returns>
+        /// <exception cref="COMException"></exception>
+        /// <exception cref="DeviceNotFoundException">If there is no default device</exception>
         public MMDevice GetDefaultAudioEndpoint(EDataFlow dataFlow, ERole role)
         {
-            IMMDevice _Device;
-            Marshal.ThrowExceptionForHR(_realEnumerator.GetDefaultAudioEndpoint(dataFlow, role, out _Device));
-            return new MMDevice(_Device);
+            try
+            {
+                IMMDevice _Device;
+                Marshal.ThrowExceptionForHR(_realEnumerator.GetDefaultAudioEndpoint(dataFlow, role, out _Device));
+                return new MMDevice(_Device);
+
+            }
+            catch (COMException comException) when (comException.ErrorCode == DeviceNotFoundException.E_NOTFOUND)
+            {//if COMException will be used the same way in other methods consider create Exception Mapper instead of manual try/catch
+                throw new DeviceNotFoundException("No devices found during default device detection",comException);
+            }
         }
 
         public MMDevice GetDevice(string deviceId)

Forms/FormSwitcher.cs

@@ -97,8 +97,7 @@ public FormSwitcher()
             SetTrayIcons();
 
             VolBar.VolumeMuteChanged += IconChanged;
-            if (listDevices.Items.Count > 0)
-                VolBar.RegisterDevice(RenderType);
+            VolBar.RegisterDevice(RenderType);
 
             EndPoints.NotifyClient.DefaultChanged += DefaultChanged;
             EndPoints.NotifyClient.DeviceAdded += DeviceAdded;
@@ -402,8 +401,7 @@ private void notifyIcon1_MouseUp(object sender, MouseEventArgs e)
                 return;
             }
 
-            if (listDevices.Items.Count > 0)
-                VolBar.RegisterDevice(RenderType);
+            VolBar.RegisterDevice(RenderType);
 
             if (e.Button == MouseButtons.Left)
             {
@@ -503,13 +501,16 @@ private void SetDeviceIcon(int index, bool isSelected)
 
         private void SetTrayIcons()
         {
-            var devSettings = Program.settings.Device.Find(x =>
-            {
-                var dev = listDevices.SelectedItems[0];
-                return x.DeviceID == dev.Tag.ToString();
-            });
-            if (listDevices.SelectedItems.Count == 0 ||
-                devSettings == null ||
+            Settings.CDevice devSettings=null;
+
+            if (listDevices.SelectedItems.Count > 0)
+                devSettings = Program.settings.Device.Find(x =>
+                {
+                    var dev = listDevices.SelectedItems[0];
+                    return x.DeviceID == dev.Tag.ToString();
+                });
+
+            if (devSettings == null ||
                 (devSettings.Hue == 0 &&
                  devSettings.Saturation == 0 &&
                  devSettings.Brightness == 0))