Made some LocalAPI methods async - Updated example, now without SynchronizingObject

Author: Jonas Dellinger

SpotifyAPI.Example/LocalControl.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Diagnostics;
 using System.Globalization;
+using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace SpotifyAPI.Example
@@ -22,7 +23,7 @@ public LocalControl()
             _spotify.OnTrackChange += _spotify_OnTrackChange;
             _spotify.OnTrackTimeChange += _spotify_OnTrackTimeChange;
             _spotify.OnVolumeChange += _spotify_OnVolumeChange;
-            _spotify.SynchronizingObject = this;
+            //_spotify.SynchronizingObject = this;
 
             artistLinkLabel.Click += (sender, args) => Process.Start(artistLinkLabel.Tag.ToString());
             albumLinkLabel.Click += (sender, args) => Process.Start(albumLinkLabel.Tag.ToString());
@@ -108,22 +109,42 @@ public void UpdatePlayingStatus(bool playing)
 
         private void _spotify_OnVolumeChange(object sender, VolumeChangeEventArgs e)
         {
+            if (InvokeRequired)
+            {
+                Invoke(new Action(() => _spotify_OnVolumeChange(sender, e)));
+                return;
+            }
             volumeLabel.Text = (e.NewVolume * 100).ToString(CultureInfo.InvariantCulture);
         }
 
         private void _spotify_OnTrackTimeChange(object sender, TrackTimeChangeEventArgs e)
         {
-            timeLabel.Text = $"{FormatTime(e.TrackTime)}/{FormatTime(_currentTrack.Length)}";
+            if (InvokeRequired)
+            {
+                Invoke(new Action(() => _spotify_OnTrackTimeChange(sender, e)));
+                return;
+            }
+            timeLabel.Text = $@"{FormatTime(e.TrackTime)}/{FormatTime(_currentTrack.Length)}";
             timeProgressBar.Value = (int)e.TrackTime;
         }
 
         private void _spotify_OnTrackChange(object sender, TrackChangeEventArgs e)
         {
+            if (InvokeRequired)
+            {
+                Invoke(new Action(() => _spotify_OnTrackChange(sender, e)));
+                return;
+            }
             UpdateTrack(e.NewTrack);
         }
 
         private void _spotify_OnPlayStateChange(object sender, PlayStateEventArgs e)
         {
+            if (InvokeRequired)
+            {
+                Invoke(new Action(() => _spotify_OnPlayStateChange(sender, e)));
+                return;
+            }
             UpdatePlayingStatus(e.Playing);
         }
 
@@ -132,19 +153,19 @@ private void connectBtn_Click(object sender, EventArgs e)
             Connect();
         }
 
-        private void playUrlBtn_Click(object sender, EventArgs e)
+        private async void playUrlBtn_Click(object sender, EventArgs e)
         {
-            _spotify.PlayURL(playTextBox.Text, contextTextBox.Text);
+            await _spotify.PlayURL(playTextBox.Text, contextTextBox.Text);
         }
 
-        private void playBtn_Click(object sender, EventArgs e)
+        private async void playBtn_Click(object sender, EventArgs e)
         {
-            _spotify.Play();
+            await _spotify.Play();
         }
 
-        private void pauseBtn_Click(object sender, EventArgs e)
+        private async void pauseBtn_Click(object sender, EventArgs e)
         {
-            _spotify.Pause();
+            await _spotify.Pause();
         }
 
         private void prevBtn_Click(object sender, EventArgs e)

SpotifyAPI/Local/SpotifyLocalAPI.cs

@@ -4,6 +4,7 @@
 using System.Diagnostics;
 using System.IO;
 using System.Runtime.InteropServices;
+using System.Threading.Tasks;
 using System.Timers;
 
 namespace SpotifyAPI.Local
@@ -234,17 +235,17 @@ public float GetSpotifyVolume()
         /// <summary>
         /// Pause function
         /// </summary>
-        public void Pause()
+        public async Task Pause()
         {
-            _rh.SendPauseRequest();
+            await _rh.SendPauseRequest();
         }
 
         /// <summary>
         /// Play function
         /// </summary>
-        public void Play()
+        public async Task Play()
         {
-            _rh.SendPlayRequest();
+            await _rh.SendPlayRequest();
         }
 
         /// <summary>
@@ -265,19 +266,19 @@ internal void PressKey(byte keyCode)
         /// <remarks>
         /// Contexts are basically a queue in spotify. a song can be played within a context, meaning that hitting next / previous would lead to another song. Contexts are leveraged by widgets as described in the "Multiple tracks player" section of the following documentation page: https://developer.spotify.com/technologies/widgets/spotify-play-button/
         /// </remarks>
-        public void PlayURL(string uri, string context = "")
+        public async Task PlayURL(string uri, string context = "")
         {
-            _rh.SendPlayRequest(uri, context);
+            await _rh.SendPlayRequest(uri, context);
         }
 
         /// <summary>
         /// Adds a Spotify URI to the Queue
         /// </summary>
         /// <param name="uri">The Spotify URI</param>
         [Obsolete("This method doesn't work with the current spotify version.")]
-        public void AddToQueue(string uri)
+        public async Task AddToQueue(string uri)
         {
-            _rh.SendQueueRequest(uri);
+            await _rh.SendQueueRequest(uri);
         }
 
         /// <summary>